init

util/time.go

@@ -0,0 +1,33 @@
+package util
+
+import "time"
+
+var (
+	shanghai = Location("Asia/Shanghai")  // Shanghai *time.Location
+	hongkong = Location("Asia/Hong_Kong") // Hong Kong *time.Location
+	local    = Location("Local")          // Local *time.Location
+	utc      = Location("UTC")            // UTC *time.Location
+)
+
+// Location returns *time.Location by location name.
+func Location(name string) *time.Location {
+	loc, err := time.LoadLocation(name)
+	if err != nil {
+		panic(err)
+	}
+	return loc
+}
+
+// Shanghai returns Shanghai *time.Location.
+func Shanghai() *time.Location {
+	return shanghai
+}
+
+// TimeNowUnixNano returns now unix nanosecond timestamp.
+func TimeNowUnixNano(location ...*time.Location) int64 {
+	loc := Shanghai()
+	if len(location) != 0 {
+		loc = location[0]
+	}
+	return time.Now().In(loc).UnixNano()
+}