update time stamp format

csst_common/data_manager.py

@@ -283,7 +283,7 @@ class CsstMsDataManager:
     def write_stamp(self):
         if self.stamps is not None and self.stamps != "":
             with open(self.l1_file(self.stamps), "a+") as f:
-                f.write(f"{time.Time.now().isot.replace('.', ',')}+0800\n")
+                f.write(f"{time.Time.now().isot}+08:00\n")
 
     @staticmethod
     def now():