1. import datetime
  3. def extend_time(time_str, duration_str):
  4. """
  5. Extends a given time string by a specified duration.
  7. Args:
  8. time_str (str): A time string in HH:MM:SS format.
  9. duration_str (str): A duration string in DD:HH:MM:SS format.
  11. Returns:
  12. str: The extended time string in HH:MM:SS format, or None if there's an error.
  13. """
  14. try:
  15. # Parse the initial time string
  16. start_time = datetime.datetime.strptime(time_str, "%H:%M:%S").time()
  18. # Parse the duration string
  19. duration = datetime.timedelta(hours=int(duration_str.split(":")[0]),
  20. minutes=int(duration_str.split(":")[1]),
  21. seconds=int(duration_str.split(":")[2]))
  23. # Extend the time
  24. extended_time = datetime.datetime.combine(datetime.date.today(), start_time) + duration
  26. # Format the extended time back to HH:MM:SS
  27. extended_time_str = extended_time.strftime("%H:%M:%S")
  28. return extended_time_str
  30. except ValueError:
  31. return None # Handle invalid input format
  32. except Exception as e:
  33. return None # Handle other potential errors

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