added datetime tracking

app/utils.py

@@ -0,0 +1,11 @@
+from datetime import datetime
+from zoneinfo import ZoneInfo
+
+_time_zone = ""
+
+def set_time_zone(time_zone: str):
+    global _time_zone
+    _time_zone = time_zone
+
+def format_datetime(format: str):
+    return datetime.now(ZoneInfo(_time_zone)).strftime(format)