title: Subtracting days, months or years from date using php
body: <p>I have a db table with a date field <code>startBefore</code> in <code>('Y-m-d')</code> format. There are also 3 other int fields representing years, months and days. What I would like to do is to fill these three fields the new <code>startAfter</code> date in <code>'Y-m-d'</code> format.</p>
  
  <p>For example I have the '2001-11-14' as <code>startBefore</code> date and I would like to subtract 3 yrs, 7 months, 1 day to get the <code>startAfter</code> date.</p>
  
  <p>Any ideas how I can accomplish this?</p>
  
  <p>Thanks!</p>