diff --git a/src/common/data.ts b/src/common/data.ts
index 5c27f9e..ffba6b3 100644
--- a/src/common/data.ts
+++ b/src/common/data.ts
@@ -5,7 +5,7 @@ export let groups: Group[] = []
 export let friends: Friend[] = []
 export let msgHistory: Record<string, RawMessage> = {}  // msgId: RawMessage
 
-let globalMsgId = Date.now() / 1000;
+let globalMsgId = Math.floor(Date.now() / 1000);
 
 export function addHistoryMsg(msg: RawMessage): boolean{
     let existMsg = msgHistory[msg.msgId]