python code to achieve imitation weibo chat time formatting display

 """
    1. if not in the same year '%Y year %m month %d day'
    2. If in the same year
      2.1 If in the same month
        2.1.1 If on the same day '%H:%M'
        2.1.2 If yesterday 'Yesterday %H:%M'
        2.1.2 if in the same week 'week x 00:00' Remove the case of Sunday
      2.2 Otherwise '%m month %d day %H:%M'
    """

 def fmtdt_str(dtstr, fmt): 
    result = ""
    (locale.LC_CTYPE, 'chinese')
    curtime = ()
    curYear = 
    curMonth = 
    str_time = (dtstr, fmt)
    if str_time.year == curYear:
      if str_time.month == curMonth:
        days_interval = ( - str_time.day)
        if days_interval == 0:
          result = str_time.strftime("%H:%M")
        elif days_interval == 1:
          result = str_time.strftime("Yesterday %H:%M")
        else:
          if ("%W") == str_time.strftime("%W"):
            week_str = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
            str_weekno = str_time.weekday()
            if str_weekno == 0:
              result = str_time.strftime("%m month %d day %H:%M")
            else:
              result = str_time.strftime(week_str[str_weekno] + " %H:%M")
          else:
            result = str_time.strftime("%m month %d day %H:%M")
      else:
        result = str_time.strftime("%m month %d day %H:%M")
    else:
      result = str_time.strftime("%Y year %m month %d day")
    return result