"""
    1.如果不在同一年 '%Y年%m月%d日'
    2.如果在同一年
      2.1 如果在同一個月
        2.1.1 如果在同一天 '%H:%M'
        2.1.2 如果是昨天 '昨天 %H:%M'
        2.1.2 如果在同一周 '周x 00:00' 去除周日 的情況
      2.2 否則 '%m月%d日 %H:%M'
    """

 def fmtdt_str(dtstr, fmt): 
    result = ""
    locale.setlocale(locale.LC_CTYPE, 'chinese')
    curtime = datetime.now()
    curYear = curtime.year
    curMonth = curtime.month
    str_time = datetime.strptime(dtstr, fmt)
    if str_time.year == curYear:
      if str_time.month == curMonth:
        days_interval = (curtime.day - str_time.day)
        if days_interval == 0:
          result = str_time.strftime("%H:%M")
        elif days_interval == 1:
          result = str_time.strftime("昨天 %H:%M")
        else:
          if curtime.strftime("%W") == str_time.strftime("%W"):
            week_str = ['周日', '周一', '周二', '周三', '周四', '周五', '周六']
            str_weekno = str_time.weekday()
            if str_weekno == 0:
              result = str_time.strftime("%m月%d日 %H:%M")
            else:
              result = str_time.strftime(week_str[str_weekno] + " %H:%M")
          else:
            result = str_time.strftime("%m月%d日 %H:%M")
      else:
        result = str_time.strftime("%m月%d日 %H:%M")
    else:
      result = str_time.strftime("%Y年%m月%d日")
    return result