diff --git a/datetime/conversion.go b/datetime/conversion.go
new file mode 100644
index 0000000..367c5a0
--- /dev/null
+++ b/datetime/conversion.go
@@ -0,0 +1,52 @@
+// Copyright 2021 dudaodong@gmail.com. All rights reserved.
+// Use of this source code is governed by MIT license.
+
+package datetime
+
+import "time"
+
+type theTime struct {
+	unix int64
+}
+
+func NewUnixNow() *theTime {
+	return &theTime{unix: time.Now().Unix()}
+}
+
+func NewUnix(unix int64) *theTime {
+	return &theTime{unix: unix}
+}
+
+func NewFormat(t string) (*theTime, error) {
+	timeLayout := "2006-01-02 15:04:05"
+	loc := time.FixedZone("CST", 8*3600)
+	tt, err := time.ParseInLocation(timeLayout, t, loc)
+	if err != nil {
+		return nil, err
+	}
+	return &theTime{unix: tt.Unix()}, nil
+}
+
+func NewISO8601(iso8601 string) (*theTime, error) {
+	t, err := time.ParseInLocation(time.RFC3339, iso8601, time.UTC)
+	if err != nil {
+		return nil, err
+	}
+	return &theTime{unix: t.Unix()}, nil
+}
+
+func (t *theTime) ToUnix() int64 {
+	return t.unix
+}
+
+func (t *theTime) ToFormat() string {
+	return time.Unix(t.unix, 0).Format("2006-01-02 15:04:05")
+}
+
+func (t *theTime) ToFormatForTpl(tpl string) string {
+	return time.Unix(t.unix, 0).Format(tpl)
+}
+
+func (t *theTime) ToIso8601() string {
+	return time.Unix(t.unix, 0).Format(time.RFC3339)
+}