diff --git a/pywxdump/api/remote_server.py b/pywxdump/api/remote_server.py
index fa26592..a6c32ce 100644
--- a/pywxdump/api/remote_server.py
+++ b/pywxdump/api/remote_server.py
@@ -462,11 +462,13 @@ def get_date_count():
     word = rq_data.get("wxid", "")
     start_time = rq_data.get("start_time", 0)
     end_time = rq_data.get("end_time", 0)
+    time_format = rq_data.get("time_format", "%Y-%m-%d")
 
     my_wxid = get_conf(g.caf, g.at, "last")
     if not my_wxid: return ReJson(1001, body="my_wxid is required")
     db_config = get_conf(g.caf, my_wxid, "db_config")
-    date_count = DBHandler(db_config).get_date_count(wxid=word, start_time=start_time, end_time=end_time)
+    db = DBHandler(db_config)
+    date_count = db.get_date_count(wxid=word, start_time=start_time, end_time=end_time, time_format=time_format)
     return ReJson(0, date_count)
 
 
diff --git a/pywxdump/db/dbMSG.py b/pywxdump/db/dbMSG.py
index 4e5c985..a667878 100644
--- a/pywxdump/db/dbMSG.py
+++ b/pywxdump/db/dbMSG.py
@@ -291,7 +291,7 @@ class MsgHandler(DatabaseBase):
         return rdata, list(wxid_list)
 
     @db_error
-    def get_date_count(self, wxid='', start_time: int = 0, end_time: int = 0):
+    def get_date_count(self, wxid='', start_time: int = 0, end_time: int = 0, time_format='%Y-%m-%d'):
         """
         获取每日聊天记录数量，包括发送者数量、接收者数量和总数。
         """
@@ -312,7 +312,8 @@ class MsgHandler(DatabaseBase):
         sql_time = "AND CreateTime BETWEEN ? AND ? " if start_time and end_time else ""
         params = params + (start_time, end_time) if start_time and end_time else params
 
-        sql = ("SELECT strftime('%Y-%m-%d', CreateTime, 'unixepoch', 'localtime') AS date, COUNT(*) AS total_count ,"
+        sql = (f"SELECT strftime('{time_format}', CreateTime, 'unixepoch', 'localtime') AS date, "
+               "       COUNT(*) AS total_count ,"
                "       SUM(CASE WHEN IsSender = 1 THEN 1 ELSE 0 END) AS sender_count, "
                "       SUM(CASE WHEN IsSender = 0 THEN 1 ELSE 0 END) AS receiver_count "
                "FROM MSG "