Add conversion from old schedules format to the new one

Improve conversion with regex group

app/service/app_svc.py

@@ -4,6 +4,7 @@
 import hashlib
 import json
 import os
+import re
 import time
 from collections import namedtuple
 from datetime import datetime, timezone
@@ -83,11 +84,17 @@ async def run_scheduler(self):
         while True:
             interval = 60
             for s in await self.get_service('data_svc').locate('schedules'):
-                now = datetime.now(timezone.utc)
                 if not croniter.croniter.is_valid(s.schedule):
-                    self.log.warning(f"The schedule {s.id} with the format `{s.schedule}` is incompatible with cron!")
-                    continue
+                    match = re.match(r'^(\d{2}):(\d{2}):\d{2}\.\d{6}$', s.schedule)
+                    if match:
+                        hour, minute = match.groups()
+                        s.schedule = f"{minute} {hour} * * *"
+                        self.log.info(f"Converted time schedule {s.id} to cron format: {s.schedule}")
+                    else:
+                        self.log.warning(f"The schedule {s.id} with the format `{s.schedule}` is incompatible with cron!")
+                        continue
 
+                now = datetime.now()
                 cron = croniter.croniter(s.schedule, now)
                 diff = now - cron.get_prev(datetime)
                 if interval > diff.total_seconds() > 0: