diff --git a/contrib/babelfishpg_tsql/antlr/TSqlLexer.g4 b/contrib/babelfishpg_tsql/antlr/TSqlLexer.g4
index f20791fb29..d52ea2f0a8 100644
--- a/contrib/babelfishpg_tsql/antlr/TSqlLexer.g4
+++ b/contrib/babelfishpg_tsql/antlr/TSqlLexer.g4
@@ -243,6 +243,7 @@ DATEFORMAT:                                      D A T E F O R M A T;
 DATE_FORMAT:                                     D A T E  UNDERLINE  F O R M A T;
 DATENAME:                                        D A T E N A M E;
 DATEPART:                                        D A T E P A R T;
+DATETRUNC:                                       D A T E T R U N C;
 DATE_CORRELATION_OPTIMIZATION:                   D A T E  UNDERLINE  C O R R E L A T I O N  UNDERLINE  O P T I M I Z A T I O N;
 DAY:                                             D A Y;
 DAYS:                                            D A Y S;
diff --git a/contrib/babelfishpg_tsql/antlr/TSqlParser.g4 b/contrib/babelfishpg_tsql/antlr/TSqlParser.g4
index f99ee992eb..93267cdeaa 100644
--- a/contrib/babelfishpg_tsql/antlr/TSqlParser.g4
+++ b/contrib/babelfishpg_tsql/antlr/TSqlParser.g4
@@ -4338,6 +4338,7 @@ keyword
     | DATE_FORMAT
     | DATENAME
     | DATEPART
+    | DATETRUNC
     | DATE_CORRELATION_OPTIMIZATION
     | DATE_FORMAT
     | DAY
diff --git a/contrib/babelfishpg_tsql/sql/sys_functions.sql b/contrib/babelfishpg_tsql/sql/sys_functions.sql
index 0b8cdb4543..92b73b1511 100644
--- a/contrib/babelfishpg_tsql/sql/sys_functions.sql
+++ b/contrib/babelfishpg_tsql/sql/sys_functions.sql
@@ -4386,3 +4386,109 @@ BEGIN
 END;
 $body$
 LANGUAGE plpgsql IMMUTABLE;
+
+CREATE OR REPLACE FUNCTION sys.DATETRUNC(IN datepart PG_CATALOG.TEXT, IN date ANYELEMENT) RETURNS ANYELEMENT AS
+$body$
+DECLARE
+    days_offset INT;
+    v_day INT;
+    result_date timestamp;
+    input_expr_timestamp timestamp;
+    date_arg_datatype regtype;
+    offset_string PG_CATALOG.TEXT;
+    datefirst_value INT;
+BEGIN
+    BEGIN
+        /* perform input validation */
+        date_arg_datatype := pg_typeof(date);
+        IF datepart NOT IN ('year', 'quarter', 'month', 'week', 'tsql_week', 'hour', 'minute', 'second', 'millisecond', 'microsecond', 
+                            'doy', 'day', 'nanosecond', 'tzoffset') THEN
+            RAISE EXCEPTION '''%'' is not a recognized datetrunc option.', datepart;
+        ELSIF date_arg_datatype NOT IN ('date'::regtype, 'time'::regtype, 'sys.datetime'::regtype, 'sys.datetime2'::regtype,
+                                        'sys.datetimeoffset'::regtype, 'sys.smalldatetime'::regtype) THEN
+            RAISE EXCEPTION 'Argument data type ''%'' is invalid for argument 2 of datetrunc function.', date_arg_datatype;
+        ELSIF datepart IN ('nanosecond', 'tzoffset') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''%''.',datepart, date_arg_datatype;
+        ELSIF datepart IN ('dow') THEN
+            RAISE EXCEPTION 'The datepart ''weekday'' is not supported by date function datetrunc for data type ''%''.', date_arg_datatype;
+        ELSIF date_arg_datatype = 'date'::regtype AND datepart IN ('hour', 'minute', 'second', 'millisecond', 'microsecond') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''date''.', datepart;
+        ELSIF date_arg_datatype = 'datetime'::regtype AND datepart IN ('microsecond') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''datetime''.', datepart;
+        ELSIF date_arg_datatype = 'smalldatetime'::regtype AND datepart IN ('millisecond', 'microsecond') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''smalldatetime''.', datepart;
+        ELSIF date_arg_datatype = 'time'::regtype THEN
+            IF datepart IN ('year', 'quarter', 'month', 'doy', 'day', 'week', 'tsql_week') THEN
+                RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''time''.', datepart;
+            END IF;
+            -- Limitation in determining if the specified fractional scale (if provided any) for time datatype is 
+            -- insufficient to support provided datepart (millisecond, microsecond) value
+        ELSIF date_arg_datatype IN ('datetime2'::regtype, 'datetimeoffset'::regtype) THEN
+            -- Limitation in determining if the specified fractional scale (if provided any) for the above datatype is
+            -- insufficient to support for provided datepart (millisecond, microsecond) value
+        END IF;
+
+        /* input validation is complete, proceed with result calculation. */
+        IF date_arg_datatype = 'time'::regtype THEN
+            RETURN date_trunc(datepart, date);
+        ELSE
+            input_expr_timestamp = date::timestamp;
+            -- preserving offset_string value in the case of datetimeoffset datatype before converting it to timestamps 
+            IF date_arg_datatype = 'sys.datetimeoffset'::regtype THEN
+                offset_string = RIGHT(date::PG_CATALOG.TEXT, 6);
+                input_expr_timestamp := LEFT(date::PG_CATALOG.TEXT, -6)::timestamp;
+            END IF;
+            CASE
+                WHEN datepart IN ('year', 'quarter', 'month', 'week', 'hour', 'minute', 'second', 'millisecond', 'microsecond')  THEN
+                    result_date := date_trunc(datepart, input_expr_timestamp);
+                WHEN datepart IN ('doy', 'day') THEN
+                    result_date := date_trunc('day', input_expr_timestamp);
+                WHEN datepart IN ('tsql_week') THEN
+                -- sql server datepart 'iso_week' is similar to postgres 'week' datepart
+                -- handle sql server datepart 'week' here based on the value of set variable 'DATEFIRST'
+                    v_day := EXTRACT(dow from input_expr_timestamp)::INT;
+                    datefirst_value := current_setting('babelfishpg_tsql.datefirst')::INT;
+                    IF v_day = 0 THEN
+                        v_day := 7;
+                    END IF;
+                    result_date := date_trunc('day', input_expr_timestamp);
+                    days_offset := (7 + v_day - datefirst_value)%7;
+                    result_date := result_date - make_interval(days => days_offset);
+            END CASE;
+            -- concat offset_string to result_date in case of datetimeoffset before converting it to datetimeoffset datatype.
+            IF date_arg_datatype = 'sys.datetimeoffset'::regtype THEN
+                RETURN concat(result_date, ' ', offset_string)::sys.datetimeoffset;
+            ELSE
+                RETURN result_date;
+            END IF;
+        END IF;
+    END;
+END;
+$body$
+LANGUAGE plpgsql STABLE;
+
+-- another definition of datetrunc as anyelement can not handle unknown type.
+CREATE OR REPLACE FUNCTION sys.DATETRUNC(IN datepart PG_CATALOG.TEXT, IN date PG_CATALOG.TEXT) RETURNS SYS.DATETIME2 AS
+$body$
+DECLARE
+    input_expr_datetime2 sys.datetime2;
+BEGIN
+    IF datepart NOT IN ('year', 'quarter', 'month', 'week', 'tsql_week', 'hour', 'minute', 'second', 'millisecond', 'microsecond', 
+                        'doy', 'day', 'nanosecond', 'tzoffset') THEN
+            RAISE EXCEPTION '''%'' is not a recognized datetrunc option.', datepart;
+    END IF;
+    BEGIN
+    input_expr_datetime2 := cast(date as sys.datetime2);
+    exception
+        WHEN others THEN
+                RAISE USING MESSAGE := 'Conversion failed when converting date and/or time from character string.';
+    END;
+    IF input_expr_datetime2 IS NULL THEN
+        RETURN NULL;
+    ELSE
+        -- input string literal is valid, call the datetrunc function with datetime2 datatype. 
+        RETURN sys.DATETRUNC(datepart, input_expr_datetime2);
+    END IF;
+END;
+$body$
+LANGUAGE plpgsql STABLE;
diff --git a/contrib/babelfishpg_tsql/sql/upgrades/babelfishpg_tsql--3.3.0--3.4.0.sql b/contrib/babelfishpg_tsql/sql/upgrades/babelfishpg_tsql--3.3.0--3.4.0.sql
index 2965f71f92..b5d8fd90dd 100644
--- a/contrib/babelfishpg_tsql/sql/upgrades/babelfishpg_tsql--3.3.0--3.4.0.sql
+++ b/contrib/babelfishpg_tsql/sql/upgrades/babelfishpg_tsql--3.3.0--3.4.0.sql
@@ -757,6 +757,113 @@ $BODY$
 LANGUAGE plpgsql
 IMMUTABLE;
 
+
+CREATE OR REPLACE FUNCTION sys.DATETRUNC(IN datepart PG_CATALOG.TEXT, IN date ANYELEMENT) RETURNS ANYELEMENT AS
+$body$
+DECLARE
+    days_offset INT;
+    v_day INT;
+    result_date timestamp;
+    input_expr_timestamp timestamp;
+    date_arg_datatype regtype;
+    offset_string PG_CATALOG.TEXT;
+    datefirst_value INT;
+BEGIN
+    BEGIN
+        /* perform input validation */
+        date_arg_datatype := pg_typeof(date);
+        IF datepart NOT IN ('year', 'quarter', 'month', 'week', 'tsql_week', 'hour', 'minute', 'second', 'millisecond', 'microsecond', 
+                            'doy', 'day', 'nanosecond', 'tzoffset') THEN
+            RAISE EXCEPTION '''%'' is not a recognized datetrunc option.', datepart;
+        ELSIF date_arg_datatype NOT IN ('date'::regtype, 'time'::regtype, 'sys.datetime'::regtype, 'sys.datetime2'::regtype,
+                                        'sys.datetimeoffset'::regtype, 'sys.smalldatetime'::regtype) THEN
+            RAISE EXCEPTION 'Argument data type ''%'' is invalid for argument 2 of datetrunc function.', date_arg_datatype;
+        ELSIF datepart IN ('nanosecond', 'tzoffset') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''%''.',datepart, date_arg_datatype;
+        ELSIF datepart IN ('dow') THEN
+            RAISE EXCEPTION 'The datepart ''weekday'' is not supported by date function datetrunc for data type ''%''.', date_arg_datatype;
+        ELSIF date_arg_datatype = 'date'::regtype AND datepart IN ('hour', 'minute', 'second', 'millisecond', 'microsecond') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''date''.', datepart;
+        ELSIF date_arg_datatype = 'datetime'::regtype AND datepart IN ('microsecond') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''datetime''.', datepart;
+        ELSIF date_arg_datatype = 'smalldatetime'::regtype AND datepart IN ('millisecond', 'microsecond') THEN
+            RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''smalldatetime''.', datepart;
+        ELSIF date_arg_datatype = 'time'::regtype THEN
+            IF datepart IN ('year', 'quarter', 'month', 'doy', 'day', 'week', 'tsql_week') THEN
+                RAISE EXCEPTION 'The datepart ''%'' is not supported by date function datetrunc for data type ''time''.', datepart;
+            END IF;
+            -- Limitation in determining if the specified fractional scale (if provided any) for time datatype is 
+            -- insufficient to support provided datepart (millisecond, microsecond) value
+        ELSIF date_arg_datatype IN ('datetime2'::regtype, 'datetimeoffset'::regtype) THEN
+            -- Limitation in determining if the specified fractional scale (if provided any) for the above datatype is
+            -- insufficient to support for provided datepart (millisecond, microsecond) value
+        END IF;
+
+        /* input validation is complete, proceed with result calculation. */
+        IF date_arg_datatype = 'time'::regtype THEN
+            RETURN date_trunc(datepart, date);
+        ELSE
+            input_expr_timestamp = date::timestamp;
+            -- preserving offset_string value in the case of datetimeoffset datatype before converting it to timestamps 
+            IF date_arg_datatype = 'sys.datetimeoffset'::regtype THEN
+                offset_string = RIGHT(date::PG_CATALOG.TEXT, 6);
+                input_expr_timestamp := LEFT(date::PG_CATALOG.TEXT, -6)::timestamp;
+            END IF;
+            CASE
+                WHEN datepart IN ('year', 'quarter', 'month', 'week', 'hour', 'minute', 'second', 'millisecond', 'microsecond')  THEN
+                    result_date := date_trunc(datepart, input_expr_timestamp);
+                WHEN datepart IN ('doy', 'day') THEN
+                    result_date := date_trunc('day', input_expr_timestamp);
+                WHEN datepart IN ('tsql_week') THEN
+                -- sql server datepart 'iso_week' is similar to postgres 'week' datepart
+                -- handle sql server datepart 'week' here based on the value of set variable 'DATEFIRST'
+                    v_day := EXTRACT(dow from input_expr_timestamp)::INT;
+                    datefirst_value := current_setting('babelfishpg_tsql.datefirst')::INT;
+                    IF v_day = 0 THEN
+                        v_day := 7;
+                    END IF;
+                    result_date := date_trunc('day', input_expr_timestamp);
+                    days_offset := (7 + v_day - datefirst_value)%7;
+                    result_date := result_date - make_interval(days => days_offset);
+            END CASE;
+            -- concat offset_string to result_date in case of datetimeoffset before converting it to datetimeoffset datatype.
+            IF date_arg_datatype = 'sys.datetimeoffset'::regtype THEN
+                RETURN concat(result_date, ' ', offset_string)::sys.datetimeoffset;
+            ELSE
+                RETURN result_date;
+            END IF;
+        END IF;
+    END;
+END;
+$body$
+LANGUAGE plpgsql STABLE;
+
+-- another definition of datetrunc as anyelement can not handle unknown type.
+CREATE OR REPLACE FUNCTION sys.DATETRUNC(IN datepart PG_CATALOG.TEXT, IN date PG_CATALOG.TEXT) RETURNS SYS.DATETIME2 AS
+$body$
+DECLARE
+    input_expr_datetime2 sys.datetime2;
+BEGIN
+    IF datepart NOT IN ('year', 'quarter', 'month', 'week', 'tsql_week', 'hour', 'minute', 'second', 'millisecond', 'microsecond', 
+                        'doy', 'day', 'nanosecond', 'tzoffset') THEN
+            RAISE EXCEPTION '''%'' is not a recognized datetrunc option.', datepart;
+    END IF;
+    BEGIN
+    input_expr_datetime2 := cast(date as sys.datetime2);
+    exception
+        WHEN others THEN
+                RAISE USING MESSAGE := 'Conversion failed when converting date and/or time from character string.';
+    END;
+    IF input_expr_datetime2 IS NULL THEN
+        RETURN NULL;
+    ELSE
+        -- input string literal is valid, call the datetrunc function with datetime2 datatype. 
+        RETURN sys.DATETRUNC(datepart, input_expr_datetime2);
+    END IF;
+END;
+$body$
+LANGUAGE plpgsql STABLE;
+
 -- BABELFISH_SCHEMA_PERMISSIONS
 CREATE TABLE IF NOT EXISTS sys.babelfish_schema_permissions (
   dbid smallint NOT NULL,
diff --git a/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-decl.y b/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-decl.y
index 2e01b52cad..7b8a33a840 100644
--- a/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-decl.y
+++ b/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-decl.y
@@ -96,7 +96,7 @@
 
 %token <keyword> TSQL_ATAT TSQL_ALLOW_SNAPSHOT_ISOLATION
 	TSQL_CALLER TSQL_CHOOSE TSQL_CLUSTERED TSQL_COLUMNSTORE TSQL_CONVERT
-	TSQL_DATENAME TSQL_DATEPART TSQL_DATEDIFF TSQL_DATEDIFF_BIG TSQL_DATE_BUCKET TSQL_DATEADD TSQL_DEFAULT_SCHEMA TSQL_ISNULL
+	TSQL_DATENAME TSQL_DATEPART TSQL_DATETRUNC TSQL_DATEDIFF TSQL_DATEDIFF_BIG TSQL_DATE_BUCKET TSQL_DATEADD TSQL_DEFAULT_SCHEMA TSQL_ISNULL
 	TSQL_D TSQL_DAYOFYEAR TSQL_DD TSQL_DW TSQL_DY TSQL_HH TSQL_ISO_WEEK TSQL_ISOWK
 	TSQL_ISOWW TSQL_LOGIN TSQL_M TSQL_MCS TSQL_MI TSQL_MICROSECOND TSQL_MILLISECOND TSQL_MM TSQL_MS
 	TSQL_N TSQL_NANOSECOND TSQL_NONCLUSTERED TSQL_NS TSQL_OUTPUT TSQL_OUT TSQL_PARSE TSQL_Q
diff --git a/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-rule.y b/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-rule.y
index 5e57be9d3c..b595c5adc1 100644
--- a/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-rule.y
+++ b/contrib/babelfishpg_tsql/src/backend_parser/gram-tsql-rule.y
@@ -1936,6 +1936,13 @@ func_expr_common_subexpr:
 											   COERCE_EXPLICIT_CALL,
 											   @1);
 				}
+			| TSQL_DATETRUNC '(' datepart_arg ',' a_expr ')'
+				{
+					$$ = (Node *) makeFuncCall(TsqlSystemFuncName2("datetrunc"),
+												list_make2(makeStringConst($3, @3), $5),
+												COERCE_EXPLICIT_CALL,
+												@1);
+				}
 			| TSQL_DATENAME '(' datepart_arg ',' a_expr ')'
 				{
 					$$ = (Node *) makeFuncCall(TsqlSystemFuncName2("datename"),
@@ -4465,6 +4472,7 @@ reserved_keyword:
 			| TSQL_DATE_BUCKET
 			| TSQL_DATENAME
 			| TSQL_DATEPART
+			| TSQL_DATETRUNC
 			| TSQL_IIF
 			| TSQL_OUT
 			| TSQL_OUTER
diff --git a/contrib/babelfishpg_tsql/src/backend_parser/kwlist.h b/contrib/babelfishpg_tsql/src/backend_parser/kwlist.h
index 86a2fb3855..3c6e55488f 100644
--- a/contrib/babelfishpg_tsql/src/backend_parser/kwlist.h
+++ b/contrib/babelfishpg_tsql/src/backend_parser/kwlist.h
@@ -116,6 +116,7 @@ PG_KEYWORD("datediff", TSQL_DATEDIFF, RESERVED_KEYWORD)
 PG_KEYWORD("datediff_big", TSQL_DATEDIFF_BIG, RESERVED_KEYWORD)
 PG_KEYWORD("datename", TSQL_DATENAME, RESERVED_KEYWORD)
 PG_KEYWORD("datepart", TSQL_DATEPART, RESERVED_KEYWORD)
+PG_KEYWORD("datetrunc", TSQL_DATETRUNC, RESERVED_KEYWORD)
 PG_KEYWORD("day", DAY_P, UNRESERVED_KEYWORD)
 PG_KEYWORD("dayofyear", TSQL_DAYOFYEAR, UNRESERVED_KEYWORD)
 PG_KEYWORD("dd", TSQL_DD, UNRESERVED_KEYWORD)
diff --git a/contrib/babelfishpg_tsql/src/backend_parser/scan-tsql-rule.l b/contrib/babelfishpg_tsql/src/backend_parser/scan-tsql-rule.l
index fb9d9c7c10..38ea5a6aa6 100644
--- a/contrib/babelfishpg_tsql/src/backend_parser/scan-tsql-rule.l
+++ b/contrib/babelfishpg_tsql/src/backend_parser/scan-tsql-rule.l
@@ -218,6 +218,7 @@
 							case TSQL_DATE_BUCKET:
 							case TSQL_DATENAME:
 							case TSQL_DATEPART:
+							case TSQL_DATETRUNC:
 							case TSQL_D:
 							case TSQL_DAYOFYEAR:
 							case TSQL_DD:
diff --git a/contrib/babelfishpg_tsql/src/special_keywords.c b/contrib/babelfishpg_tsql/src/special_keywords.c
index f204025fc6..c608eb4f09 100644
--- a/contrib/babelfishpg_tsql/src/special_keywords.c
+++ b/contrib/babelfishpg_tsql/src/special_keywords.c
@@ -89,6 +89,7 @@ const char *pg_reserved_keywords_to_be_delimited[] = {
 	"date_bucket",
 	"datename",
 	"datepart",
+	"datetrunc",
 	"iif",
 	"out",
 	"output",
diff --git a/test/JDBC/expected/BABEL-3953-datetrunc-vu-cleanup.out b/test/JDBC/expected/BABEL-3953-datetrunc-vu-cleanup.out
new file mode 100644
index 0000000000..53d3e86cb9
--- /dev/null
+++ b/test/JDBC/expected/BABEL-3953-datetrunc-vu-cleanup.out
@@ -0,0 +1,59 @@
+DROP VIEW DATETRUNC_vu_prepare_v1
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v2
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v3
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v4
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v5
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v6
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v7
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v8
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v9
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v10
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v11
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p1
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p2
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p3
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p4
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p5
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p6
+GO
+
+DROP FUNCTION BABEL_3953_vu_prepare_f1
+GO
+
+DROP FUNCTION BABEL_3953_vu_prepare_f2
+GO
+
+DROP FUNCTION BABEL_3953_vu_prepare_f3
+GO
diff --git a/test/JDBC/expected/BABEL-3953-datetrunc-vu-prepare.out b/test/JDBC/expected/BABEL-3953-datetrunc-vu-prepare.out
new file mode 100644
index 0000000000..51dc0df6e2
--- /dev/null
+++ b/test/JDBC/expected/BABEL-3953-datetrunc-vu-prepare.out
@@ -0,0 +1,233 @@
+-- Test with date datatype
+CREATE VIEW DATETRUNC_vu_prepare_v1 AS (
+    select 
+        datetrunc(year, cast('2020-04-15' as date)) as dt1,
+        datetrunc(yy, cast('2020-04-15' as date)) as dt2,
+        datetrunc(yyyy, cast('2020-04-15' as date)) as dt3,
+        datetrunc(quarter, cast('2020-04-15' as date)) as dt4,
+        datetrunc(qq, cast('2020-04-15' as date)) as dt5,
+        datetrunc(q, cast('2020-04-15' as date)) as dt6,
+        datetrunc(month, cast('2020-04-15' as date)) as dt7,
+        datetrunc(mm, cast('2020-04-15' as date)) as dt8,
+        datetrunc(m, cast('2020-04-15' as date)) as dt9,
+        datetrunc(dayofyear, cast('2020-04-15' as date)) as dt10,
+        datetrunc(dy, cast('2020-04-15' as date)) as dt11,
+        datetrunc(y, cast('2020-04-15' as date)) as dt12,
+        datetrunc(day, cast('2020-04-15' as date)) as dt13,
+        datetrunc(dd, cast('2020-04-15' as date)) as dt14,
+        datetrunc(d, cast('2020-04-15' as date)) as dt15,
+        datetrunc(week, cast('2020-04-15' as date)) as dt16,
+        datetrunc(wk, cast('2020-04-15' as date)) as dt17,
+        datetrunc(ww, cast('2020-04-15' as date)) as dt18,
+        datetrunc(iso_week, cast('2020-04-15' as date)) as dt19,
+        datetrunc(isowk, cast('2020-04-15' as date)) as dt20,
+        datetrunc(isoww, cast('2020-04-15' as date)) as dt21
+    );
+GO
+
+-- Test with time datatype
+CREATE VIEW DATETRUNC_vu_prepare_v2 AS (
+    select 
+        datetrunc(hour, cast('12:32:45.5647311' as time)) as dt1,
+        datetrunc(hh, cast('12:32:45.5647311' as time)) as dt2,
+        datetrunc(minute, cast('12:32:45.5647311' as time)) as dt3,
+        datetrunc(mi, cast('12:32:45.5647311' as time)) as dt4,
+        datetrunc(n, cast('12:32:45.5647311' as time)) as dt5,
+        datetrunc(second, cast('12:32:45.5647311' as time)) as dt6,
+        datetrunc(ss, cast('12:32:45.5647311' as time)) as dt7,
+        datetrunc(s, cast('12:32:45.5647311' as time)) as dt8,
+        datetrunc(millisecond, cast('12:32:45.5647311' as time)) as dt9,
+        datetrunc(ms, cast('12:32:45.5647311' as time)) as dt10,
+        datetrunc(microsecond, cast('12:32:45.5647311' as time)) as dt11,
+        datetrunc(mcs, cast('12:32:45.5647311' as time)) as dt12
+    );
+GO
+
+
+-- Test with datetime datatype
+CREATE VIEW DATETRUNC_vu_prepare_v3 AS (
+    select 
+        datetrunc(year, cast('2004-06-17 09:32:42.566' as datetime)) as dt1,
+        datetrunc(quarter, cast('2004-06-17 09:32:42.566' as datetime)) as dt2,
+        datetrunc(month, cast('2004-06-17 09:32:42.566' as datetime)) as dt3,
+        datetrunc(dayofyear, cast('2004-06-17 09:32:42.566' as datetime)) as dt4,
+        datetrunc(day, cast('2004-06-17 09:32:42.566' as datetime)) as dt5,
+        datetrunc(week, cast('2004-06-17 09:32:42.566' as datetime)) as dt6,
+        datetrunc(hour, cast('2004-06-17 09:32:42.566' as datetime)) as dt7,
+        datetrunc(minute, cast('2004-06-17 09:32:42.566' as datetime)) as dt8,
+        datetrunc(second, cast('2004-06-17 09:32:42.566' as datetime)) as dt9,
+        datetrunc(millisecond, cast('2004-06-17 09:32:42.566' as datetime)) as dt10
+    );
+GO
+-- Should throw exception - 'datepart 'microsecond' is not supported by date function datetrunc for data type ''datetime''.
+CREATE VIEW DATETRUNC_vu_prepare_v4 AS (
+    select 
+        datetrunc(microsecond, cast('2004-06-17 09:32:42.566' as datetime)) as dt1
+);
+GO
+
+-- Test with smalldatetime datatype
+CREATE VIEW DATETRUNC_vu_prepare_v5 AS (
+    select 
+        datetrunc(year, cast('2004-08-14 22:34:20' as smalldatetime)) as dt1,
+        datetrunc(quarter, cast('2004-08-14 22:34:20' as smalldatetime)) as dt2,
+        datetrunc(month, cast('2004-08-14 22:34:20' as smalldatetime)) as dt3,
+        datetrunc(dayofyear, cast('2004-08-14 22:34:20' as smalldatetime)) as dt4,
+        datetrunc(day, cast('2004-08-14 22:34:20' as smalldatetime)) as dt5,
+        datetrunc(week, cast('2004-08-14 22:34:20' as smalldatetime)) as dt6,
+        datetrunc(hour, cast('2004-08-14 22:34:20' as smalldatetime)) as dt7,
+        datetrunc(minute, cast('2004-08-14 22:34:20' as smalldatetime)) as dt8,
+        datetrunc(second, cast('2004-08-14 22:34:20' as smalldatetime)) as dt9
+    );
+GO
+
+-- Should throw exception - 'datepart 'microsecond' is not supported by date function datetrunc for data type ''smalldatetime''.
+CREATE VIEW DATETRUNC_vu_prepare_v6 AS (
+    select 
+        datetrunc(microsecond, cast('2004-08-14 22:34:20' as smalldatetime)) as dt1,
+        datetrunc(millisecond, cast('2004-08-14 22:34:20' as smalldatetime)) as dt2
+);
+GO
+
+-- Test with datetime2 datatype
+CREATE VIEW DATETRUNC_vu_prepare_v7 AS (
+    select 
+        datetrunc(year, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt1,
+        datetrunc(quarter, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt2,
+        datetrunc(month, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt3,
+        datetrunc(dayofyear, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt4,
+        datetrunc(day, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt5,
+        datetrunc(week, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt6,
+        datetrunc(hour, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt7,
+        datetrunc(minute, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt8,
+        datetrunc(second, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt9,
+        datetrunc(millisecond, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt10,
+        datetrunc(microsecond, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt11
+    );
+GO
+
+-- Test with datetimeoffset datatype
+CREATE VIEW DATETRUNC_vu_prepare_v8 AS (
+    select 
+        datetrunc(year, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt1,
+        datetrunc(quarter, cast('2015-11-30 09:34:56.6574893 +10:42' as datetimeoffset)) as dt2,
+        datetrunc(month, cast('2015-11-30 09:34:56.6574893 +02:42' as datetimeoffset)) as dt3,
+        datetrunc(dayofyear, cast('2015-11-30 09:34:56.6574893 +05:42' as datetimeoffset)) as dt4,
+        datetrunc(day, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt5,
+        datetrunc(week, cast('2015-11-30 09:34:56.6574893 +13:42' as datetimeoffset)) as dt6,
+        datetrunc(hour, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt7,
+        datetrunc(minute, cast('2015-11-30 09:34:56.6574893 -12:43' as datetimeoffset)) as dt8,
+        datetrunc(second, cast('2015-11-30 09:34:56.6574893 +12:22' as datetimeoffset)) as dt9,
+        datetrunc(millisecond, cast('2015-11-30 09:34:56.6574893 -10:42' as datetimeoffset)) as dt10,
+        datetrunc(microsecond, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt11
+    );
+GO
+
+-- Test with expression input that can be converted to datetime2 datatype. 
+CREATE VIEW DATETRUNC_vu_prepare_v9 AS (
+    select 
+        datetrunc(year, '2021-Jan-01') as dt1,
+        datetrunc(year, '2021/Jan/01') as dt2,
+        datetrunc(year, '2021-1-1') as dt3,
+        datetrunc(year, '20210101') as dt4,
+        datetrunc(hour, cast('2020-01-01' as varchar)) as dt5,
+        datetrunc(minute, cast('1980-09-08' as char)) as dt6,
+        datetrunc(day, '12:32:42') as dt7,
+        datetrunc(day, '12:32:42.46378') as dt8,
+        datetrunc(week, '1990-09-09 12:32:09.546') as dt9,
+        datetrunc(week, '1990-09-09 12:32:09') as dt10,
+        datetrunc(week, '1990-09-09 12:32:09.546788') as dt11
+    );
+GO
+
+-- Test when time, datetime2, datetimeoffset casted to a specified fractional scale
+-- babelfish will always give answer that will include fractional seconds till 7 digits. 
+CREATE VIEW DATETRUNC_vu_prepare_v10 AS (
+    select 
+        datetrunc(hour, cast('12:32:43.4635' as time(3))) dt1,
+        datetrunc(month, cast('2020-12-23 20:20:20.2222' as datetime2(2))) as dt2,
+        datetrunc(week, cast('1989-09-23 05:36:43.2930 +12:37' as datetimeoffset(5))) as dt3,
+        datetrunc(minute, cast('2027-12-13 10:13:20.12236' as datetime2(4))) as dt4,
+        datetrunc(year, cast('2027-12-13 10:13:20.537478' as datetimeoffset(6))) as dt5
+    );
+GO
+
+-- Test when time, datetime2, datetimeoffset casted to a specified fractional scale which is less then the specified datepart milliseocond, microsecond.
+-- Babelfish always give answer to these with fractional seconds till 7 digits, babelfish do not throw an error similar to sql server in this case.
+CREATE VIEW DATETRUNC_vu_prepare_v11 AS (
+    select 
+        datetrunc(millisecond, cast('2002-01-01 12:33:43.435354' as datetime2(2))) as dt1,
+        datetrunc(millisecond, cast('2020-01-01 12:33:32.4324' as datetimeoffset(1))) as dt2,
+        datetrunc(millisecond, cast('12:23:43.464774' as time(0))) as dt3,
+        datetrunc(microsecond, cast('2002-01-01 12:33:43.435354' as datetime2(5))) as dt4,
+        datetrunc(microsecond, cast('2020-01-01 12:33:32.437724' as datetimeoffset(4))) as dt5
+    );
+GO
+
+
+-- Procedures
+-- Test with upper/lower limit of date/time.
+CREATE PROCEDURE BABEL_3953_vu_prepare_p1 as (
+	SELECT
+		datetrunc(month, cast('0001-01-01' as date)) as dt1,
+		datetrunc(month, cast('9999-12-31' as date)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p2 as (
+	SELECT
+		datetrunc(month, cast('1753-01-01 00:00:00 ' as datetime)) as dt1,
+		datetrunc(month, cast('9999-12-31 23:59:59.997' as datetime)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p3 as (
+	SELECT
+		datetrunc(month, cast('0001-01-01 00:00:00' as datetime2)) as dt1,
+		datetrunc(month, cast('9999-12-31 23:59:59.9999999' as datetime2)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p4 as (
+	SELECT
+		datetrunc(month, cast('0001-01-01 00:00:00 -14:00' as datetimeoffset)) as dt1,
+		datetrunc(month, cast('9999-12-31 23:59:59.9999 +14:00' as datetimeoffset)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p5 as (
+	SELECT
+		datetrunc(month, cast('1900-01-01 00:00:00' as smalldatetime)) as dt1,
+		datetrunc(day, cast('2007-06-05 23:59:59' as smalldatetime)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p6 as (
+	SELECT
+		datetrunc(hour, cast('00:00:00.0000000' as time)) as dt1,
+		datetrunc(second, cast('23:59:59.999999' as time)) as dt2
+	);
+GO
+
+
+-- functions
+CREATE FUNCTION BABEL_3953_vu_prepare_f1()
+RETURNS DATETIME2 AS
+BEGIN
+RETURN (SELECT datetrunc(iso_week, cast('2012-01-23 12:32:23.324' as datetime2)));
+END
+GO
+
+CREATE FUNCTION BABEL_3953_vu_prepare_f2()
+RETURNS time AS
+BEGIN
+RETURN (select datetrunc(second, cast('12:32:53.23' as time)));
+END
+GO
+
+CREATE FUNCTION BABEL_3953_vu_prepare_f3()
+RETURNS date AS
+BEGIN
+RETURN (select datetrunc(week, cast('2001-11-14' as date)));
+END
+GO
diff --git a/test/JDBC/expected/BABEL-3953-datetrunc-vu-verify.out b/test/JDBC/expected/BABEL-3953-datetrunc-vu-verify.out
new file mode 100644
index 0000000000..4c15424174
--- /dev/null
+++ b/test/JDBC/expected/BABEL-3953-datetrunc-vu-verify.out
@@ -0,0 +1,561 @@
+SELECT * FROM DATETRUNC_vu_prepare_v1
+GO
+~~START~~
+date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date#!#date
+2020-01-01#!#2020-01-01#!#2020-01-01#!#2020-04-01#!#2020-04-01#!#2020-04-01#!#2020-04-01#!#2020-04-01#!#2020-04-01#!#2020-04-15#!#2020-04-15#!#2020-04-15#!#2020-04-15#!#2020-04-15#!#2020-04-15#!#2020-04-12#!#2020-04-12#!#2020-04-12#!#2020-04-13#!#2020-04-13#!#2020-04-13
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v2
+GO
+~~START~~
+time#!#time#!#time#!#time#!#time#!#time#!#time#!#time#!#time#!#time#!#time#!#time
+12:00:00.0000000#!#12:00:00.0000000#!#12:32:00.0000000#!#12:32:00.0000000#!#12:32:00.0000000#!#12:32:45.0000000#!#12:32:45.0000000#!#12:32:45.0000000#!#12:32:45.5640000#!#12:32:45.5640000#!#12:32:45.5647310#!#12:32:45.5647310
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v3
+GO
+~~START~~
+datetime#!#datetime#!#datetime#!#datetime#!#datetime#!#datetime#!#datetime#!#datetime#!#datetime#!#datetime
+2004-01-01 00:00:00.0#!#2004-04-01 00:00:00.0#!#2004-06-01 00:00:00.0#!#2004-06-17 00:00:00.0#!#2004-06-17 00:00:00.0#!#2004-06-13 00:00:00.0#!#2004-06-17 09:00:00.0#!#2004-06-17 09:32:00.0#!#2004-06-17 09:32:42.0#!#2004-06-17 09:32:42.567
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v4
+GO
+~~START~~
+datetime
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: The datepart 'microsecond' is not supported by date function datetrunc for data type 'datetime'.)~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v5
+GO
+~~START~~
+smalldatetime#!#smalldatetime#!#smalldatetime#!#smalldatetime#!#smalldatetime#!#smalldatetime#!#smalldatetime#!#smalldatetime#!#smalldatetime
+2004-01-01 00:00:00.0#!#2004-07-01 00:00:00.0#!#2004-08-01 00:00:00.0#!#2004-08-14 00:00:00.0#!#2004-08-14 00:00:00.0#!#2004-08-08 00:00:00.0#!#2004-08-14 22:00:00.0#!#2004-08-14 22:34:00.0#!#2004-08-14 22:34:00.0
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v6
+GO
+~~START~~
+smalldatetime#!#smalldatetime
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: The datepart 'microsecond' is not supported by date function datetrunc for data type 'smalldatetime'.)~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v7
+GO
+~~START~~
+datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2
+2015-01-01 00:00:00.0000000#!#2015-10-01 00:00:00.0000000#!#2015-11-01 00:00:00.0000000#!#2015-11-30 00:00:00.0000000#!#2015-11-30 00:00:00.0000000#!#2015-11-29 00:00:00.0000000#!#2015-11-30 09:00:00.0000000#!#2015-11-30 09:34:00.0000000#!#2015-11-30 09:34:56.0000000#!#2015-11-30 09:34:56.6570000#!#2015-11-30 09:34:56.6574890
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v8
+GO
+~~START~~
+datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset#!#datetimeoffset
+2015-01-01 00:00:00.0000000 +12:42#!#2015-10-01 00:00:00.0000000 +10:42#!#2015-11-01 00:00:00.0000000 +02:42#!#2015-11-30 00:00:00.0000000 +05:42#!#2015-11-30 00:00:00.0000000 +12:42#!#2015-11-29 00:00:00.0000000 +13:42#!#2015-11-30 09:00:00.0000000 +12:42#!#2015-11-30 09:34:00.0000000 -12:43#!#2015-11-30 09:34:56.0000000 +12:22#!#2015-11-30 09:34:56.6570000 -10:42#!#2015-11-30 09:34:56.6574890 +12:42
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v9
+GO
+~~START~~
+datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2#!#datetime2
+2021-01-01 00:00:00.0000000#!#2021-01-01 00:00:00.0000000#!#2021-01-01 00:00:00.0000000#!#2021-01-01 00:00:00.0000000#!#2020-01-01 00:00:00.0000000#!#1980-09-08 00:00:00.0000000#!#1900-01-01 00:00:00.0000000#!#1900-01-01 00:00:00.0000000#!#1990-09-09 00:00:00.0000000#!#1990-09-09 00:00:00.0000000#!#1990-09-09 00:00:00.0000000
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v10
+GO
+~~START~~
+time#!#datetime2#!#datetimeoffset#!#datetime2#!#datetimeoffset
+12:00:00.0000000#!#2020-12-01 00:00:00.0000000#!#1989-09-17 00:00:00.0000000 +12:37#!#2027-12-13 10:13:00.0000000#!#2027-01-01 00:00:00.0000000 +00:00
+~~END~~
+
+
+SELECT * FROM DATETRUNC_vu_prepare_v11
+GO
+~~START~~
+datetime2#!#datetimeoffset#!#time#!#datetime2#!#datetimeoffset
+2002-01-01 12:33:43.4400000#!#2020-01-01 12:33:32.4000000 +00:00#!#12:23:43.0000000#!#2002-01-01 12:33:43.4353500#!#2020-01-01 12:33:32.4377000 +00:00
+~~END~~
+
+
+EXEC BABEL_3953_vu_prepare_p1
+GO
+~~START~~
+date#!#date
+0001-01-01#!#9999-12-01
+~~END~~
+
+
+EXEC BABEL_3953_vu_prepare_p2
+GO
+~~START~~
+datetime#!#datetime
+1753-01-01 00:00:00.0#!#9999-12-01 00:00:00.0
+~~END~~
+
+
+EXEC BABEL_3953_vu_prepare_p3
+GO
+~~START~~
+datetime2#!#datetime2
+0001-01-01 00:00:00.0000000#!#9999-12-01 00:00:00.0000000
+~~END~~
+
+
+EXEC BABEL_3953_vu_prepare_p4
+GO
+~~START~~
+datetimeoffset#!#datetimeoffset
+0001-01-01 00:00:00.0000000 -14:00#!#9999-12-01 00:00:00.0000000 +14:00
+~~END~~
+
+
+EXEC BABEL_3953_vu_prepare_p5
+GO
+~~START~~
+smalldatetime#!#smalldatetime
+1900-01-01 00:00:00.0#!#2007-06-06 00:00:00.0
+~~END~~
+
+
+EXEC BABEL_3953_vu_prepare_p6
+GO
+~~START~~
+time#!#time
+00:00:00.0000000#!#23:59:59.0000000
+~~END~~
+
+
+SELECT BABEL_3953_vu_prepare_f1()
+GO
+~~START~~
+datetime2
+2012-01-23 00:00:00.0000000
+~~END~~
+
+
+SELECT BABEL_3953_vu_prepare_f2()
+GO
+~~START~~
+time
+12:32:53.0000000
+~~END~~
+
+
+SELECT BABEL_3953_vu_prepare_f3()
+GO
+~~START~~
+date
+2001-11-11
+~~END~~
+
+
+select datetrunc(null, CAST('2020-01-01' as date)) as dt1
+GO
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: syntax error at or near "null")~~
+
+select datetrunc(null, null) as dt1
+GO
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: syntax error at or near "null")~~
+
+select datetrunc(null, 'NULL') as dt1
+GO
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: syntax error at or near "null")~~
+
+select datetrunc('NULL', null) as dt1
+GO
+~~START~~
+datetime2
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: 'NULL' is not a recognized datetrunc option.)~~
+
+select datetrunc('NULL', 'NULL') as dt1
+GO
+~~START~~
+datetime2
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: 'NULL' is not a recognized datetrunc option.)~~
+
+select datetrunc('year',CAST('2020-01-01' as date))
+go
+~~START~~
+date
+2020-01-01
+~~END~~
+
+select datetrunc(year, null) as dt3
+GO
+~~START~~
+datetime2
+<NULL>
+~~END~~
+
+select datetrunc(years, null) as dt4
+GO
+~~START~~
+datetime2
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: 'years' is not a recognized datetrunc option.)~~
+
+select datetrunc(nanosecond ,null) as dt5
+GO
+~~START~~
+datetime2
+<NULL>
+~~END~~
+
+SELECT datetrunc(nanosecond, 2020)
+GO
+~~START~~
+int
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: Argument data type 'integer' is invalid for argument 2 of datetrunc function.)~~
+
+select datetrunc(invalid_datepart, 2020)
+GO
+~~START~~
+int
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: 'invalid_datepart' is not a recognized datetrunc option.)~~
+
+select datetrunc(hour, 2020.0)
+GO
+~~START~~
+numeric
+~~ERROR (Code: 33557097)~~
+
+~~ERROR (Message: Argument data type 'numeric' is invalid for argument 2 of datetrunc function.)~~
+
+
+-- postgres support 6 digits of fractional time-scale so the bbf output will differ
+-- in the last fractional second digit from t-sql. bbf- 2021-12-08 11:30:15.1234570
+-- tsql- 2021-12-08 11:30:15.1234560
+DECLARE @d datetime2 = '2021-12-08 11:30:15.1234567';
+SELECT 'Microsecond', DATETRUNC(microsecond, @d);
+Go
+~~START~~
+varchar#!#datetime2
+Microsecond#!#2021-12-08 11:30:15.1234570
+~~END~~
+
+
+DECLARE @test_date date;
+SET @test_date = '1998-09-12';
+SELECT datetrunc(week, @test_date);
+GO
+~~START~~
+date
+1998-09-06
+~~END~~
+
+
+DECLARE @test_date datetime;
+SET @test_date = '2010-09-12 12:23:12.564';
+SELECT datetrunc(week, @test_date);
+GO
+~~START~~
+datetime
+2010-09-12 00:00:00.0
+~~END~~
+
+
+DECLARE @test_date datetime2;
+SET @test_date = '2010-09-12 12:23:12.56443';
+SELECT datetrunc(week, @test_date);
+GO
+~~START~~
+datetime2
+2010-09-12 00:00:00.0000000
+~~END~~
+
+
+DECLARE @test_date smalldatetime;
+SET @test_date = '2010-09-12 12:23:12';
+SELECT datetrunc(week, @test_date);
+GO
+~~START~~
+smalldatetime
+2010-09-12 00:00:00.0
+~~END~~
+
+
+DECLARE @test_date datetimeoffset;
+SET @test_date = '2010-09-12 12:23:12.56443 +10:12';
+SELECT datetrunc(week, @test_date);
+GO
+~~START~~
+datetimeoffset
+2010-09-12 00:00:00.0000000 +10:12
+~~END~~
+
+
+DECLARE @test_date time;
+SET @test_date = '12:23:12.56443';
+SELECT datetrunc(hour, @test_date);
+GO
+~~START~~
+time
+12:00:00.0000000
+~~END~~
+
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a datetime)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09 12:32:23.23' as datetime)))
+Select * from dtrunc
+Select datetrunc(week, a) from dtrunc
+GO
+~~ROW COUNT: 1~~
+
+~~START~~
+datetime
+2020-01-09 00:00:00.0
+~~END~~
+
+~~START~~
+datetime
+2020-01-05 00:00:00.0
+~~END~~
+
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a date)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09' as date)))
+Select * from dtrunc
+Select datetrunc(week, a) from dtrunc
+GO
+~~ROW COUNT: 1~~
+
+~~START~~
+date
+2020-01-09
+~~END~~
+
+~~START~~
+date
+2020-01-05
+~~END~~
+
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a datetime2)
+insert into dtrunc (a) values(datetrunc(day, '2020-01-09 12:32:23.23'))
+Select * from dtrunc
+Select datetrunc(day, a) from dtrunc
+GO
+~~ROW COUNT: 1~~
+
+~~START~~
+datetime2
+2020-01-09 00:00:00.0000000
+~~END~~
+
+~~START~~
+datetime2
+2020-01-09 00:00:00.0000000
+~~END~~
+
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a datetimeoffset)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09 12:32:23.23 -10:23' as datetimeoffset)))
+Select * from dtrunc
+Select datetrunc(month, a) from dtrunc
+GO
+~~ROW COUNT: 1~~
+
+~~START~~
+datetimeoffset
+2020-01-09 00:00:00.0000000 -10:23
+~~END~~
+
+~~START~~
+datetimeoffset
+2020-01-01 00:00:00.0000000 -10:23
+~~END~~
+
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a smalldatetime)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09 12:32:23' as smalldatetime)))
+Select * from dtrunc
+Select datetrunc(hour, a) from dtrunc
+GO
+~~ROW COUNT: 1~~
+
+~~START~~
+smalldatetime
+2020-01-09 00:00:00.0
+~~END~~
+
+~~START~~
+smalldatetime
+2020-01-09 00:00:00.0
+~~END~~
+
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a time)
+insert into dtrunc (a) values(datetrunc(minute, CAST('12:32:23.23' as time)))
+Select * from dtrunc
+Select datetrunc(second, a) from dtrunc
+GO
+~~ROW COUNT: 1~~
+
+~~START~~
+time
+12:32:00.0000000
+~~END~~
+
+~~START~~
+time
+12:32:00.0000000
+~~END~~
+
+
+SET DATEFIRST 1
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-09-13 21:32:32.23' as datetime2)) 
+SELECT DATETRUNC(WEEK, CAST('2020-09-13 21:32:32.23' as datetime2))
+GO
+~~START~~
+datetime2
+2020-09-07 00:00:00.0000000
+~~END~~
+
+~~START~~
+datetime2
+2020-09-07 00:00:00.0000000
+~~END~~
+
+
+SET DATEFIRST 1
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-08-12 21:32:32.23' as datetime2)) 
+SELECT DATETRUNC(WEEK, CAST('2020-08-12 21:32:32.23' as datetime2))
+GO
+~~START~~
+datetime2
+2020-08-10 00:00:00.0000000
+~~END~~
+
+~~START~~
+datetime2
+2020-08-10 00:00:00.0000000
+~~END~~
+
+
+SET DATEFIRST 2 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 21:32:32.23' as datetime)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:32:32.23' as datetime))
+GO
+~~START~~
+datetime
+2020-01-06 00:00:00.0
+~~END~~
+
+~~START~~
+datetime
+2020-01-07 00:00:00.0
+~~END~~
+
+
+SET DATEFIRST 3 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12' as date)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12' as date))
+GO
+~~START~~
+date
+2020-01-06
+~~END~~
+
+~~START~~
+date
+2020-01-08
+~~END~~
+
+
+SET DATEFIRST 4 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32' as smalldatetime)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23' as smalldatetime))
+GO
+~~START~~
+smalldatetime
+2020-01-06 00:00:00.0
+~~END~~
+
+~~START~~
+smalldatetime
+2020-01-09 00:00:00.0
+~~END~~
+
+
+SET DATEFIRST 5 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32' as datetime2)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23' as datetime2))
+GO
+~~START~~
+datetime2
+2020-01-06 00:00:00.0000000
+~~END~~
+
+~~START~~
+datetime2
+2020-01-10 00:00:00.0000000
+~~END~~
+
+
+SET DATEFIRST 6 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32 +12:32' as datetimeoffset)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23 -09:43' as datetimeoffset))
+GO
+~~START~~
+datetimeoffset
+2020-01-06 00:00:00.0000000 +12:32
+~~END~~
+
+~~START~~
+datetimeoffset
+2020-01-11 00:00:00.0000000 -09:43
+~~END~~
+
+
+SET DATEFIRST 7 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32 +12:32' as datetimeoffset)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23 -09:43' as datetimeoffset))
+GO
+~~START~~
+datetimeoffset
+2020-01-06 00:00:00.0000000 +12:32
+~~END~~
+
+~~START~~
+datetimeoffset
+2020-01-12 00:00:00.0000000 -09:43
+~~END~~
+
diff --git a/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-cleanup.sql b/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-cleanup.sql
new file mode 100644
index 0000000000..53d3e86cb9
--- /dev/null
+++ b/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-cleanup.sql
@@ -0,0 +1,59 @@
+DROP VIEW DATETRUNC_vu_prepare_v1
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v2
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v3
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v4
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v5
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v6
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v7
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v8
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v9
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v10
+GO
+
+DROP VIEW DATETRUNC_vu_prepare_v11
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p1
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p2
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p3
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p4
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p5
+GO
+
+DROP PROCEDURE BABEL_3953_vu_prepare_p6
+GO
+
+DROP FUNCTION BABEL_3953_vu_prepare_f1
+GO
+
+DROP FUNCTION BABEL_3953_vu_prepare_f2
+GO
+
+DROP FUNCTION BABEL_3953_vu_prepare_f3
+GO
diff --git a/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-prepare.sql b/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-prepare.sql
new file mode 100644
index 0000000000..51dc0df6e2
--- /dev/null
+++ b/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-prepare.sql
@@ -0,0 +1,233 @@
+-- Test with date datatype
+CREATE VIEW DATETRUNC_vu_prepare_v1 AS (
+    select 
+        datetrunc(year, cast('2020-04-15' as date)) as dt1,
+        datetrunc(yy, cast('2020-04-15' as date)) as dt2,
+        datetrunc(yyyy, cast('2020-04-15' as date)) as dt3,
+        datetrunc(quarter, cast('2020-04-15' as date)) as dt4,
+        datetrunc(qq, cast('2020-04-15' as date)) as dt5,
+        datetrunc(q, cast('2020-04-15' as date)) as dt6,
+        datetrunc(month, cast('2020-04-15' as date)) as dt7,
+        datetrunc(mm, cast('2020-04-15' as date)) as dt8,
+        datetrunc(m, cast('2020-04-15' as date)) as dt9,
+        datetrunc(dayofyear, cast('2020-04-15' as date)) as dt10,
+        datetrunc(dy, cast('2020-04-15' as date)) as dt11,
+        datetrunc(y, cast('2020-04-15' as date)) as dt12,
+        datetrunc(day, cast('2020-04-15' as date)) as dt13,
+        datetrunc(dd, cast('2020-04-15' as date)) as dt14,
+        datetrunc(d, cast('2020-04-15' as date)) as dt15,
+        datetrunc(week, cast('2020-04-15' as date)) as dt16,
+        datetrunc(wk, cast('2020-04-15' as date)) as dt17,
+        datetrunc(ww, cast('2020-04-15' as date)) as dt18,
+        datetrunc(iso_week, cast('2020-04-15' as date)) as dt19,
+        datetrunc(isowk, cast('2020-04-15' as date)) as dt20,
+        datetrunc(isoww, cast('2020-04-15' as date)) as dt21
+    );
+GO
+
+-- Test with time datatype
+CREATE VIEW DATETRUNC_vu_prepare_v2 AS (
+    select 
+        datetrunc(hour, cast('12:32:45.5647311' as time)) as dt1,
+        datetrunc(hh, cast('12:32:45.5647311' as time)) as dt2,
+        datetrunc(minute, cast('12:32:45.5647311' as time)) as dt3,
+        datetrunc(mi, cast('12:32:45.5647311' as time)) as dt4,
+        datetrunc(n, cast('12:32:45.5647311' as time)) as dt5,
+        datetrunc(second, cast('12:32:45.5647311' as time)) as dt6,
+        datetrunc(ss, cast('12:32:45.5647311' as time)) as dt7,
+        datetrunc(s, cast('12:32:45.5647311' as time)) as dt8,
+        datetrunc(millisecond, cast('12:32:45.5647311' as time)) as dt9,
+        datetrunc(ms, cast('12:32:45.5647311' as time)) as dt10,
+        datetrunc(microsecond, cast('12:32:45.5647311' as time)) as dt11,
+        datetrunc(mcs, cast('12:32:45.5647311' as time)) as dt12
+    );
+GO
+
+
+-- Test with datetime datatype
+CREATE VIEW DATETRUNC_vu_prepare_v3 AS (
+    select 
+        datetrunc(year, cast('2004-06-17 09:32:42.566' as datetime)) as dt1,
+        datetrunc(quarter, cast('2004-06-17 09:32:42.566' as datetime)) as dt2,
+        datetrunc(month, cast('2004-06-17 09:32:42.566' as datetime)) as dt3,
+        datetrunc(dayofyear, cast('2004-06-17 09:32:42.566' as datetime)) as dt4,
+        datetrunc(day, cast('2004-06-17 09:32:42.566' as datetime)) as dt5,
+        datetrunc(week, cast('2004-06-17 09:32:42.566' as datetime)) as dt6,
+        datetrunc(hour, cast('2004-06-17 09:32:42.566' as datetime)) as dt7,
+        datetrunc(minute, cast('2004-06-17 09:32:42.566' as datetime)) as dt8,
+        datetrunc(second, cast('2004-06-17 09:32:42.566' as datetime)) as dt9,
+        datetrunc(millisecond, cast('2004-06-17 09:32:42.566' as datetime)) as dt10
+    );
+GO
+-- Should throw exception - 'datepart 'microsecond' is not supported by date function datetrunc for data type ''datetime''.
+CREATE VIEW DATETRUNC_vu_prepare_v4 AS (
+    select 
+        datetrunc(microsecond, cast('2004-06-17 09:32:42.566' as datetime)) as dt1
+);
+GO
+
+-- Test with smalldatetime datatype
+CREATE VIEW DATETRUNC_vu_prepare_v5 AS (
+    select 
+        datetrunc(year, cast('2004-08-14 22:34:20' as smalldatetime)) as dt1,
+        datetrunc(quarter, cast('2004-08-14 22:34:20' as smalldatetime)) as dt2,
+        datetrunc(month, cast('2004-08-14 22:34:20' as smalldatetime)) as dt3,
+        datetrunc(dayofyear, cast('2004-08-14 22:34:20' as smalldatetime)) as dt4,
+        datetrunc(day, cast('2004-08-14 22:34:20' as smalldatetime)) as dt5,
+        datetrunc(week, cast('2004-08-14 22:34:20' as smalldatetime)) as dt6,
+        datetrunc(hour, cast('2004-08-14 22:34:20' as smalldatetime)) as dt7,
+        datetrunc(minute, cast('2004-08-14 22:34:20' as smalldatetime)) as dt8,
+        datetrunc(second, cast('2004-08-14 22:34:20' as smalldatetime)) as dt9
+    );
+GO
+
+-- Should throw exception - 'datepart 'microsecond' is not supported by date function datetrunc for data type ''smalldatetime''.
+CREATE VIEW DATETRUNC_vu_prepare_v6 AS (
+    select 
+        datetrunc(microsecond, cast('2004-08-14 22:34:20' as smalldatetime)) as dt1,
+        datetrunc(millisecond, cast('2004-08-14 22:34:20' as smalldatetime)) as dt2
+);
+GO
+
+-- Test with datetime2 datatype
+CREATE VIEW DATETRUNC_vu_prepare_v7 AS (
+    select 
+        datetrunc(year, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt1,
+        datetrunc(quarter, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt2,
+        datetrunc(month, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt3,
+        datetrunc(dayofyear, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt4,
+        datetrunc(day, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt5,
+        datetrunc(week, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt6,
+        datetrunc(hour, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt7,
+        datetrunc(minute, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt8,
+        datetrunc(second, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt9,
+        datetrunc(millisecond, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt10,
+        datetrunc(microsecond, cast('2015-11-30 09:34:56.6574893' as datetime2)) as dt11
+    );
+GO
+
+-- Test with datetimeoffset datatype
+CREATE VIEW DATETRUNC_vu_prepare_v8 AS (
+    select 
+        datetrunc(year, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt1,
+        datetrunc(quarter, cast('2015-11-30 09:34:56.6574893 +10:42' as datetimeoffset)) as dt2,
+        datetrunc(month, cast('2015-11-30 09:34:56.6574893 +02:42' as datetimeoffset)) as dt3,
+        datetrunc(dayofyear, cast('2015-11-30 09:34:56.6574893 +05:42' as datetimeoffset)) as dt4,
+        datetrunc(day, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt5,
+        datetrunc(week, cast('2015-11-30 09:34:56.6574893 +13:42' as datetimeoffset)) as dt6,
+        datetrunc(hour, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt7,
+        datetrunc(minute, cast('2015-11-30 09:34:56.6574893 -12:43' as datetimeoffset)) as dt8,
+        datetrunc(second, cast('2015-11-30 09:34:56.6574893 +12:22' as datetimeoffset)) as dt9,
+        datetrunc(millisecond, cast('2015-11-30 09:34:56.6574893 -10:42' as datetimeoffset)) as dt10,
+        datetrunc(microsecond, cast('2015-11-30 09:34:56.6574893 +12:42' as datetimeoffset)) as dt11
+    );
+GO
+
+-- Test with expression input that can be converted to datetime2 datatype. 
+CREATE VIEW DATETRUNC_vu_prepare_v9 AS (
+    select 
+        datetrunc(year, '2021-Jan-01') as dt1,
+        datetrunc(year, '2021/Jan/01') as dt2,
+        datetrunc(year, '2021-1-1') as dt3,
+        datetrunc(year, '20210101') as dt4,
+        datetrunc(hour, cast('2020-01-01' as varchar)) as dt5,
+        datetrunc(minute, cast('1980-09-08' as char)) as dt6,
+        datetrunc(day, '12:32:42') as dt7,
+        datetrunc(day, '12:32:42.46378') as dt8,
+        datetrunc(week, '1990-09-09 12:32:09.546') as dt9,
+        datetrunc(week, '1990-09-09 12:32:09') as dt10,
+        datetrunc(week, '1990-09-09 12:32:09.546788') as dt11
+    );
+GO
+
+-- Test when time, datetime2, datetimeoffset casted to a specified fractional scale
+-- babelfish will always give answer that will include fractional seconds till 7 digits. 
+CREATE VIEW DATETRUNC_vu_prepare_v10 AS (
+    select 
+        datetrunc(hour, cast('12:32:43.4635' as time(3))) dt1,
+        datetrunc(month, cast('2020-12-23 20:20:20.2222' as datetime2(2))) as dt2,
+        datetrunc(week, cast('1989-09-23 05:36:43.2930 +12:37' as datetimeoffset(5))) as dt3,
+        datetrunc(minute, cast('2027-12-13 10:13:20.12236' as datetime2(4))) as dt4,
+        datetrunc(year, cast('2027-12-13 10:13:20.537478' as datetimeoffset(6))) as dt5
+    );
+GO
+
+-- Test when time, datetime2, datetimeoffset casted to a specified fractional scale which is less then the specified datepart milliseocond, microsecond.
+-- Babelfish always give answer to these with fractional seconds till 7 digits, babelfish do not throw an error similar to sql server in this case.
+CREATE VIEW DATETRUNC_vu_prepare_v11 AS (
+    select 
+        datetrunc(millisecond, cast('2002-01-01 12:33:43.435354' as datetime2(2))) as dt1,
+        datetrunc(millisecond, cast('2020-01-01 12:33:32.4324' as datetimeoffset(1))) as dt2,
+        datetrunc(millisecond, cast('12:23:43.464774' as time(0))) as dt3,
+        datetrunc(microsecond, cast('2002-01-01 12:33:43.435354' as datetime2(5))) as dt4,
+        datetrunc(microsecond, cast('2020-01-01 12:33:32.437724' as datetimeoffset(4))) as dt5
+    );
+GO
+
+
+-- Procedures
+-- Test with upper/lower limit of date/time.
+CREATE PROCEDURE BABEL_3953_vu_prepare_p1 as (
+	SELECT
+		datetrunc(month, cast('0001-01-01' as date)) as dt1,
+		datetrunc(month, cast('9999-12-31' as date)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p2 as (
+	SELECT
+		datetrunc(month, cast('1753-01-01 00:00:00 ' as datetime)) as dt1,
+		datetrunc(month, cast('9999-12-31 23:59:59.997' as datetime)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p3 as (
+	SELECT
+		datetrunc(month, cast('0001-01-01 00:00:00' as datetime2)) as dt1,
+		datetrunc(month, cast('9999-12-31 23:59:59.9999999' as datetime2)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p4 as (
+	SELECT
+		datetrunc(month, cast('0001-01-01 00:00:00 -14:00' as datetimeoffset)) as dt1,
+		datetrunc(month, cast('9999-12-31 23:59:59.9999 +14:00' as datetimeoffset)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p5 as (
+	SELECT
+		datetrunc(month, cast('1900-01-01 00:00:00' as smalldatetime)) as dt1,
+		datetrunc(day, cast('2007-06-05 23:59:59' as smalldatetime)) as dt2
+	);
+GO
+
+CREATE PROCEDURE BABEL_3953_vu_prepare_p6 as (
+	SELECT
+		datetrunc(hour, cast('00:00:00.0000000' as time)) as dt1,
+		datetrunc(second, cast('23:59:59.999999' as time)) as dt2
+	);
+GO
+
+
+-- functions
+CREATE FUNCTION BABEL_3953_vu_prepare_f1()
+RETURNS DATETIME2 AS
+BEGIN
+RETURN (SELECT datetrunc(iso_week, cast('2012-01-23 12:32:23.324' as datetime2)));
+END
+GO
+
+CREATE FUNCTION BABEL_3953_vu_prepare_f2()
+RETURNS time AS
+BEGIN
+RETURN (select datetrunc(second, cast('12:32:53.23' as time)));
+END
+GO
+
+CREATE FUNCTION BABEL_3953_vu_prepare_f3()
+RETURNS date AS
+BEGIN
+RETURN (select datetrunc(week, cast('2001-11-14' as date)));
+END
+GO
diff --git a/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-verify.sql b/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-verify.sql
new file mode 100644
index 0000000000..ebefb27462
--- /dev/null
+++ b/test/JDBC/input/functions/BABEL-3953-datetrunc-vu-verify.sql
@@ -0,0 +1,209 @@
+SELECT * FROM DATETRUNC_vu_prepare_v1
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v2
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v3
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v4
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v5
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v6
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v7
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v8
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v9
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v10
+GO
+
+SELECT * FROM DATETRUNC_vu_prepare_v11
+GO
+
+EXEC BABEL_3953_vu_prepare_p1
+GO
+
+EXEC BABEL_3953_vu_prepare_p2
+GO
+
+EXEC BABEL_3953_vu_prepare_p3
+GO
+
+EXEC BABEL_3953_vu_prepare_p4
+GO
+
+EXEC BABEL_3953_vu_prepare_p5
+GO
+
+EXEC BABEL_3953_vu_prepare_p6
+GO
+
+SELECT BABEL_3953_vu_prepare_f1()
+GO
+
+SELECT BABEL_3953_vu_prepare_f2()
+GO
+
+SELECT BABEL_3953_vu_prepare_f3()
+GO
+
+select datetrunc(null, CAST('2020-01-01' as date)) as dt1
+GO
+select datetrunc(null, null) as dt1
+GO
+select datetrunc(null, 'NULL') as dt1
+GO
+select datetrunc('NULL', null) as dt1
+GO
+select datetrunc('NULL', 'NULL') as dt1
+GO
+select datetrunc('year',CAST('2020-01-01' as date))
+go
+select datetrunc(year, null) as dt3
+GO
+select datetrunc(years, null) as dt4
+GO
+select datetrunc(nanosecond ,null) as dt5
+GO
+SELECT datetrunc(nanosecond, 2020)
+GO
+select datetrunc(invalid_datepart, 2020)
+GO
+select datetrunc(hour, 2020.0)
+GO
+
+-- postgres support 6 digits of fractional time-scale so the bbf output will differ
+-- in the last fractional second digit from t-sql. bbf- 2021-12-08 11:30:15.1234570
+-- tsql- 2021-12-08 11:30:15.1234560
+DECLARE @d datetime2 = '2021-12-08 11:30:15.1234567';
+SELECT 'Microsecond', DATETRUNC(microsecond, @d);
+Go
+
+DECLARE @test_date date;
+SET @test_date = '1998-09-12';
+SELECT datetrunc(week, @test_date);
+GO
+
+DECLARE @test_date datetime;
+SET @test_date = '2010-09-12 12:23:12.564';
+SELECT datetrunc(week, @test_date);
+GO
+
+DECLARE @test_date datetime2;
+SET @test_date = '2010-09-12 12:23:12.56443';
+SELECT datetrunc(week, @test_date);
+GO
+
+DECLARE @test_date smalldatetime;
+SET @test_date = '2010-09-12 12:23:12';
+SELECT datetrunc(week, @test_date);
+GO
+
+DECLARE @test_date datetimeoffset;
+SET @test_date = '2010-09-12 12:23:12.56443 +10:12';
+SELECT datetrunc(week, @test_date);
+GO
+
+DECLARE @test_date time;
+SET @test_date = '12:23:12.56443';
+SELECT datetrunc(hour, @test_date);
+GO
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a datetime)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09 12:32:23.23' as datetime)))
+Select * from dtrunc
+Select datetrunc(week, a) from dtrunc
+GO
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a date)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09' as date)))
+Select * from dtrunc
+Select datetrunc(week, a) from dtrunc
+GO
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a datetime2)
+insert into dtrunc (a) values(datetrunc(day, '2020-01-09 12:32:23.23'))
+Select * from dtrunc
+Select datetrunc(day, a) from dtrunc
+GO
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a datetimeoffset)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09 12:32:23.23 -10:23' as datetimeoffset)))
+Select * from dtrunc
+Select datetrunc(month, a) from dtrunc
+GO
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a smalldatetime)
+insert into dtrunc (a) values(datetrunc(day, CAST('2020-01-09 12:32:23' as smalldatetime)))
+Select * from dtrunc
+Select datetrunc(hour, a) from dtrunc
+GO
+
+DROP TABLE IF EXISTS dtrunc
+GO
+Create table dtrunc(a time)
+insert into dtrunc (a) values(datetrunc(minute, CAST('12:32:23.23' as time)))
+Select * from dtrunc
+Select datetrunc(second, a) from dtrunc
+GO
+
+SET DATEFIRST 1
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-09-13 21:32:32.23' as datetime2)) 
+SELECT DATETRUNC(WEEK, CAST('2020-09-13 21:32:32.23' as datetime2))
+GO
+
+SET DATEFIRST 1
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-08-12 21:32:32.23' as datetime2)) 
+SELECT DATETRUNC(WEEK, CAST('2020-08-12 21:32:32.23' as datetime2))
+GO
+
+SET DATEFIRST 2 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 21:32:32.23' as datetime)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:32:32.23' as datetime))
+GO
+
+SET DATEFIRST 3 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12' as date)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12' as date))
+GO
+
+SET DATEFIRST 4 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32' as smalldatetime)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23' as smalldatetime))
+GO
+
+SET DATEFIRST 5 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32' as datetime2)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23' as datetime2))
+GO
+
+SET DATEFIRST 6 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32 +12:32' as datetimeoffset)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23 -09:43' as datetimeoffset))
+GO
+
+SET DATEFIRST 7 
+SELECT DATETRUNC(ISO_WEEK, CAST('2020-01-12 12:22:32 +12:32' as datetimeoffset)) 
+SELECT DATETRUNC(WEEK, CAST('2020-01-12 21:23:23 -09:43' as datetimeoffset))
+GO
diff --git a/test/JDBC/upgrade/latest/schedule b/test/JDBC/upgrade/latest/schedule
index 97bcac0f0d..7de0f0759b 100644
--- a/test/JDBC/upgrade/latest/schedule
+++ b/test/JDBC/upgrade/latest/schedule
@@ -113,6 +113,7 @@ BABEL-3844
 BABEL-3914
 BABEL-3938
 BABEL-3952
+BABEL-3953-datetrunc
 BABEL-404
 BABEL-405
 BABEL-4078
diff --git a/test/python/expected/upgrade_validation/expected_dependency.out b/test/python/expected/upgrade_validation/expected_dependency.out
index 0b8376494e..385115fae4 100644
--- a/test/python/expected/upgrade_validation/expected_dependency.out
+++ b/test/python/expected/upgrade_validation/expected_dependency.out
@@ -352,7 +352,6 @@ Function sys.datetimeoffset_hash(sys.datetimeoffset)
 Function sys.datetimeoffset_larger(sys.datetimeoffset,sys.datetimeoffset)
 Function sys.datetimeoffset_smaller(sys.datetimeoffset,sys.datetimeoffset)
 Function sys.datetimeoffset_sqlvariant(sys.datetimeoffset)
-Function sys.datetimeoffsetscale(sys.datetimeoffset,integer)
 Function sys.db_id()
 Function sys.db_id(sys.nvarchar)
 Function sys.db_name()