Task 1 incorrectly allows incorrect times to pass

[xeophon]

Task 1 asks for a calendar entry at Tuesday at 3pm.

The grading function contains this part:

  # Check for time (15:00 or 3pm)
  if re.search(r'DTSTART.*T15\d{4}', ics_content) or re.search(r'DTSTART.*T030000', ics_content):
      scores["time_correct"] = 1.0
  else:
      scores["time_correct"] = 0.0

r'DTSTART.*T030000' would allow (invalid) 3AM to still pass. Also, the T15\d{4} is overly permissive, allowing 15:59:59 to pass.