javascript - Get correct time if it's changed on Window -


as title, how can correct date, time if it's changed user (with , without internet connection) example: real time july 2nd 2015 , user changed july 1st 2015, how can true value: july 2nd 2015??? (it's if using php, javascript or cmd) me please, thanks. , sorry bad english.

edit:

thanks answer

about project: want create key, has start , end date must current time check if key out of date, if user changes time of window previous day, key won't out of date (project installed , run on user pc) again.


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