.

utils.py

@@ -1,20 +1,30 @@
 from datetime import datetime, timedelta
+from typing import Optional
 
 from config import config
 
 def time_to_hour(time: timedelta) -> float:
     return time.total_seconds() / 3600
 
-def today_start():
+def today_start() -> datetime:
     td = datetime.today()
     year = td.year
     month = td.month
     day = td.day
-    return datetime(year=year, month=month, day=day, hour=0).strftime(config.DATETIME_FORMAT)
+    return datetime(year=year, month=month, day=day, hour=0)
 
-def today_end():
+def today_end() -> datetime:
     td = datetime.today()
     year = td.year
     month = td.month
     day = td.day
-    return datetime(year=year, month=month, day=day, hour=23).strftime(config.DATETIME_FORMAT)
+    return datetime(year=year, month=month, day=day, hour=23)
+
+
+def str_to_date(date: str) -> Optional[datetime]:
+    if date:
+        return datetime.strptime(date + "T00:00:00Z", config.DATETIME_FORMAT)
+
+def format_date(date: datetime) -> datetime:
+    if date:
+        return date.strftime(config.DATETIME_FORMAT)