好吧，Unix时间戳表示为自1970年1月1日以来的秒数，因此，如果您从另一个中减去一个，则会得到以秒为单位的差.那么，天数的差异就是除以一天中的秒数即可.

Well, Unix timestamps are expressed as a number of seconds since 01 Jan 1970, so if you subtract one from the other you get the difference in seconds. The difference in days is then simply a matter of dividing by the number of seconds in a day:

(date_modified - date_submitted) / (24*60*60)

或

(date_modified - date_submitted) / 86400