code: def validate_date(date, project_member_id, filename):
      
      try:
          arrow.get(date)
      except Exception:
          return False
      return True
docs: Check if date is in ISO 8601 format.
  
      :param date: This field is the date to be checked.
      :param project_member_id: This field is the project_member_id corresponding
          to the date provided.
      :param filename: This field is the filename corresponding to the date
          provided.