code: def get_time_diff_days(start_txt, end_txt):
      ''' Number of days between two days  '''
  
      if start_txt is None or end_txt is None:
          return None
  
      start = parser.parse(start_txt)
      end = parser.parse(end_txt)
  
      seconds_day = float(60 * 60 * 24)
      diff_days = \
          (end - start).total_seconds() / seconds_day
      diff_days = float('%.2f' % diff_days)
  
      return diff_dayf get_time_diff_days(start_txt, end_txt):
      ''' Number of days between two days  '''
  
      if start_txt is None or end_txt is None:
          return None
  
      start = parser.parse(start_txt)
      end = parser.parse(end_txt)
  
      seconds_day = float(60 * 60 * 24)
      diff_days = \
          (end - start).total_seconds() / seconds_day
      diff_days = float('%.2f' % diff_days)
  
      return diff_days
docs: Number of days between two days