PHP从离线PC获取真实日期

Question

我正在为客户端创建离线 php 系统，我想在没有互联网的情况下获得确切日期，并且考虑到用户可以更改PC 时间，那么解决方案是什么？

Answer 1

date() will use the system time, unless otherwise specified not to. That being said, you cannot avoid the user from changing their system clock. If you want to make sure date and time are not changed by the user, use the internet to validate. Since you must be offline, you'll just have to trust the user.