title: How to subtract x amount of days from todays date
body: <p>I need to count back 90 days, 120 days and 160 days for a few items. How would I code this?
  I keep finding java code but that brings up errors when I am developing for android. </p>
  
  <p>I need to take todays date and subtract the x amount of days and have it result be displayed on the screen nothing else. Thanks</p>