1. from datetime import datetime, timedelta
  3. def compare_dates(scheduled_run_start, actual_run_start, tolerance=timedelta(seconds=0)):
  4. """
  5. Compares two date/time values, handling potential edge cases.
  7. Args:
  8. scheduled_run_start (datetime): The scheduled start time.
  9. actual_run_start (datetime): The actual start time.
  10. tolerance (timedelta, optional): Allowed time difference. Defaults to 0.
  12. Returns:
  13. str: A string indicating the comparison result.
  14. "On time" if within tolerance.
  15. "Early" if actual is before scheduled.
  16. "Late" if actual is after scheduled.
  17. "Invalid input" if inputs are invalid.
  18. """
  19. if not isinstance(scheduled_run_start, datetime) or not isinstance(actual_run_start, datetime):
  20. return "Invalid input" # Handle invalid input types
  22. if scheduled_run_start > actual_run_start + tolerance:
  23. return "Late"
  24. elif scheduled_run_start < actual_run_start - tolerance:
  25. return "Early"
  26. else:
  27. return "On time"
  29. if __name__ == '__main__':
  30. # Test cases
  31. print(compare_dates(datetime(2023, 10, 27, 10, 0, 0), datetime(2023, 10, 27, 10, 0, 10))) # On time
  32. print(compare_dates(datetime(2023, 10, 27, 10, 0, 0), datetime(2023, 10, 27, 9, 59, 59))) # Early
  33. print(compare_dates(datetime(2023, 10, 27, 10, 0, 0), datetime(2023, 10, 27, 10, 0, 20))) # Late
  34. print(compare_dates(datetime(2023, 10, 27, 10, 0, 0), datetime(2023, 10, 27, 10, 0, 0))) # On time
  35. print(compare_dates(datetime(2023, 10, 27, 10, 0, 0), datetime(2023, 10, 27, 10, 0, 0), timedelta(minutes=1))) # On time with tolerance
  36. print(compare_dates("not a datetime", datetime(2023, 10, 27, 10, 0, 0))) # Invalid input
  37. print(compare_dates(datetime(2023, 10, 27, 10, 0, 0), "not a datetime")) # Invalid input

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