def timediff_to_str(timestamp):
onlineTime = datetime.datetime.fromtimestamp(timestamp)
localTime = datetime.datetime.now()
result = localTime - onlineTime
hours = int(result.seconds / 3600)
minutes = int(result.seconds % 3600 / 60)
seconds = result.seconds%3600%60
return "{0}天{1}时{2}分{3}秒".format(result.days,hours,minutes,seconds)