title: Where is Apache getting date-time from?
body: <p>I am deploying my (PHP, MySQL) app on client local machine. For Expiry I am comparing current date with start date &amp; End Date in DB. If current date is between start date &amp; end date than fine go ahead, other wise user will not be able to login.
  How would user By PASS my app expiry logic. I need to know possible tricks where user can bypass my app so that I work on it and make expiry unbeatable.
  I need to know from where Apache is taking current date. if from OS then user can change it &amp; bypass my app.</p>