input: Write a function to retrieve an object representing the time and date: Sunday March 7, 5:30 PM. The function should return a datetime object.
  assert get_date_time()==datetime(2021, 3, 7, 17, 30)
  assert get_date_time()==datetime(2021, 3, 7, 17, 30)
  assert get_date_time()==datetime(2021, 3, 7, 17, 30)
  assert get_date_time()==datetime(2021, 3, 7, 17, 30)
  assert get_date_time()==datetime(2021, 3, 7, 17, 30)
output: def get_date_time():
      return datetime(2021, 3, 7, 17, 30)