diff --git a/types/timestamp.go b/types/timestamp.go
index c399fb7..db3f643 100644
--- a/types/timestamp.go
+++ b/types/timestamp.go
@@ -16,7 +16,7 @@ func SetLocation(name string) {
 }
 
 // Timestamp 時間戳
-type Timestamp int
+type Timestamp int64
 
 func GetUnixNow() Timestamp {
 	return Timestamp(time.Now().Unix())