diff --git a/README.md b/README.md
index 9f6a0e3..7142f24 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@ A modern, comprehensive and efficient utility library of Golang.
 
 # Features
 - Comprehensive, efficient and reusable.
-- Numerous util functions, support string, slice, map, datetime, crypto...
+- Numerous utility functions, support string, slice, map, datetime, crypto...
 - Only depend on the go standard and golang.org/x library.
 - High unit test coverage for exported functions.
 
diff --git a/cmp/cmp.go b/cmp/cmp.go
index 428e855..323f745 100644
--- a/cmp/cmp.go
+++ b/cmp/cmp.go
@@ -3,6 +3,7 @@
 package cmp
 
 import (
+	"cmp"
 	"reflect"
 
 	"golang.org/x/exp/constraints"
@@ -113,3 +114,19 @@ func isComparable(lhs, rhs any) bool {
 	r := reflect.ValueOf(rhs)
 	return l.Kind() == r.Kind()
 }
+
+// Min compare two values and return smaller value.
+func Min[T cmp.Ordered](x, y T) T {
+	if x < y {
+		return x
+	}
+	return y
+}
+
+// Max compare two values and return larger value.
+func Max[T cmp.Ordered](x, y T) T {
+	if x > y {
+		return x
+	}
+	return y
+}
diff --git a/cmp/cmp_test.go b/cmp/cmp_test.go
index 7634255..a350532 100644
--- a/cmp/cmp_test.go
+++ b/cmp/cmp_test.go
@@ -4,6 +4,7 @@ import (
 	"reflect"
 	"testing"
 
+	"github.com/dablelv/cyan/internal"
 	"golang.org/x/exp/constraints"
 )
 
@@ -94,3 +95,19 @@ func TestCompare(t *testing.T) {
 		})
 	}
 }
+
+func TestMin(t *testing.T) {
+	assert := internal.NewAssert(t, "TestMin")
+
+	assert.Equal(1, Min(1, 2))
+	assert.Equal(1.1, Min(2.2, 1.1))
+	assert.Equal("abc", Min("abc", "cba"))
+}
+
+func TestMax(t *testing.T) {
+	assert := internal.NewAssert(t, "TestMax")
+
+	assert.Equal(2, Max(1, 2))
+	assert.Equal(2.2, Max(2.2, 1.1))
+	assert.Equal("cba", Max("abc", "cba"))
+}
diff --git a/slice/crud.go b/slice/crud.go
index 92244c8..08ed544 100644
--- a/slice/crud.go
+++ b/slice/crud.go
@@ -7,11 +7,11 @@ import (
 //
 // All of the functions in this file are the supplement to the standard library slices package.
 // The standard library functions Insert, Delete, DeleteFunc, Replace, Index, IndexFunc
-// implemented by generics in the https://pkg.go.dev/golang.org/x/exp/slices package should be used first.
+// implemented by generics in the https://pkg.go.dev/slices package should be used first.
 //
 
 // Insert inserts the values v... into s at index i and returns the result slice.
-// Unlike the standard library function Insert, Insert won't modify the original slice.
+// Unlike the standard library, Insert won't modify the original slice.
 func Insert[S ~[]E, E any](s S, i int, v ...E) S {
 	r := make(S, len(s)+len(v))
 	copy(r, s[:i])
diff --git a/time/time.go b/time/time.go
index 40248d8..3c2265c 100644
--- a/time/time.go
+++ b/time/time.go
@@ -7,16 +7,18 @@ import (
 )
 
 const (
-	YFormatNum          = "2006"
-	YMFormatNum         = "200601"
-	DateFormatNum       = "20060102"
-	DateHFormatNum      = "2006010215"
-	DateHMFormatNum     = "200601021504"
-	DateTimeFormatNum   = "20060102150405"
-	HFormatNum          = "15"
-	HMFormatNum         = "1504"
-	TimeFormatNum       = "150405"
-	DateFormat          = "2006-01-02"
+	YFormatNum        = "2006"
+	YMFormatNum       = "200601"
+	DateFormatNum     = "20060102"
+	DateHFormatNum    = "2006010215"
+	DateHMFormatNum   = "200601021504"
+	DateTimeFormatNum = "20060102150405"
+	HFormatNum        = "15"
+	HMFormatNum       = "1504"
+	TimeFormatNum     = "150405"
+	// Deprecated: please use standard library time.Dateonly
+	DateFormat = "2006-01-02"
+	// Deprecated: please use standard library time.TimeOnly
 	TimeFormat          = "15:04:05"
 	DateTimeFormat      = "2006-01-02 15:04:05"
 	DateTimeFormatMilli = "2006-01-02 15:04:05.000"