input: Write a function to calculate the difference between two times in hours and minutes.
  assert get_time_difference("02:30PM", "04:45PM") == datetime.timedelta(hours=2, minutes=15)
  assert get_time_difference("11:00AM", "01:30PM") == datetime.timedelta(hours=2, minutes=30)
  assert get_time_difference("08:00AM", "08:00PM") == datetime.timedelta(hours=12)
output: def get_time_difference(start, end):
      from datetime import datetime, timedelta
  
      def convert_to_24_hour(time_str):
          return datetime.strptime(time_str, '%I:%M%p')
      
      start_time = convert_to_24_hour(start)
      end_time = convert_to_24_hour(end)
      
      if end_time < start_time:
          end_time += timedelta(days=1)
      
      time_difference = end_time - start_time
      return time_difference