def getTimeStamp(cn):
  messages=mailServer.retr(cn)[1]
  mail = email.message_from_bytes('\n'.encode('utf-8').join(messages))
  date=email.header.decode_header(mail.get('date'))
  utcstr = date[0][0].replace('+00:00','')
  global utcdatetime
  try:
    utcdatetime = datetime.datetime.strptime(utcstr, '%a, %d %b %Y %H:%M:%S +0000 (GMT)')
    localdatetime = utcdatetime + datetime.timedelta(hours=+8)
    localtimestamp = localdatetime.timestamp()
  except:
    utcdatetime = datetime.datetime.strptime(utcstr, '%a, %d %b %Y %H:%M:%S +0800')
    localtimestamp = utcdatetime.timestamp()
  return localtimestamp

bu_daytimestamp yesterdaytimestamp两个是需要补数据的时间戳

key_nums=0
mid2=mailCount
while 1==1:
  mid=getTimeStamp(round(mailCount))
  mid2=round(mid2/2)
  if mid >bu_daytimestamp:
    mailCount=mailCount-mid2
  elif mid<yesterdaytimestamp:
    mailCount=mailCount+mid2
  elif mid <=bu_daytimestamp and mid >=yesterdaytimestamp:
    key_nums=mailCount
    break
  print(mailCount)
print(key_nums)