Update time-zones.md

unknown time zones read from system zoneinfo
Altinity · Feb 29, 2024 · fc4cd65 · fc4cd65
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diff --git a/content/en/altinity-kb-queries-and-syntax/time-zones.md b/content/en/altinity-kb-queries-and-syntax/time-zones.md
@@ -79,6 +79,16 @@ Query id: 855453d7-eccd-44cb-9631-f63bb02a273c
 
 ```
 
+Clickhouse uses system timezone info from tzdata package if it exists, and uses own builtin tzdata if it is missing in the system.
+
+```
+cd /usr/share/zoneinfo/Canada
+ln -s ../America/Halifax A
+
+TZ=Canada/A clickhouse-local -q 'select timezone()'
+Canada/A
+```
+
 ### When the conversion using different rules happen
 
 ```sql