use firestore timestamp

fire/crud_time.go

@@ -23,15 +23,15 @@ func (up *cudTime) toMapForCreate() map[string]interface{} {
 	val["delete_time"] = 0
 	val["is_deleted"] = false
 	val["update_time"] = up.TimeSec
-	val["updated_date"] = up.Time
-	val["created_date"] = up.Time
+	val["updated_date"] = firestore.ServerTimestamp
+	val["created_date"] = firestore.ServerTimestamp
 	return val
 }
 
 func (up *cudTime) toMapForUpdate() map[string]interface{} {
 	val := make(map[string]interface{})
 	val["update_time"] = up.TimeSec
-	val["updated_date"] = up.Time
+	val["updated_date"] = firestore.ServerTimestamp
 	return val
 }
 
@@ -40,8 +40,8 @@ func (up *cudTime) toMapForDelete() map[string]interface{} {
 	val["is_deleted"] = true
 	val["update_time"] = up.TimeSec
 	val["delete_time"] = up.TimeSec
-	val["updated_date"] = up.Time
-	val["deleted_date"] = up.Time
+	val["updated_date"] = firestore.ServerTimestamp
+	val["deleted_date"] = firestore.ServerTimestamp
 	return val
 }