title: if system date changes, how to prevent user change date of application in android?
body: <p>In an Android offline application , i have been stuck in to an issue that.</p>
  
  <p>if user changes the system date of android tablet/device than user is able to make some fake entries past dates. </p>
  
  <p>i have tried to restrict user up to one week by taking last sync time and current time i.e user can very date for one week from current system date but if <strong>system date changes</strong> than my scenario does not work for past days.</p>