title: How to Subtract Minutes
body: <p>I want to send a reminder email.I don't want to use <code>cron</code> on Linux/Unix/BSD box or Scheduled Tasks on Windows.</p>
  
  <p>I'm trying to subtract 15 minutes from the current time.</p>
  
  <p>here is my code so far (doesn't work): </p>
  
  <pre><code>$days   = date("j",time());
  $months = date("n",time());
  $years  = date("Y",time());
  $hours  = date("G",time());
  $mins   = (date("i",time()));
  $secs   = date("s",time());
  $mins   = $mins-15;
  </code></pre>