title: strtotime conversion: only date
body: <p>So I'm trying to take a date I have stored in a string, and increment it by one week 9 times. (I want 10 dates total).</p>
  
  <p>The value of <code>$start_date</code> is initially: <code>2013-12-04 12:00</code>, but when I increment it it becomes:</p>
  
  <pre><code>606813 
  then: 
  1211613
  1816413 and so on.
  </code></pre>
  
  <p>I understand that the formatting will change, but I don't understand why I am getting the results that I do. The second returned number seems to imply:</p>
  
  <p>12(month)11(day)6(some unkown thing)13(year) </p>
  
  <p>which would be a week, but the first and third returned numbers doesn't make sense at all unless there is a 60th and 18th month of the year I'm not aware of, and they're all missing a time to go along with the date.</p>
  
  <p>This is my first attempt to use <code>strtotime()</code> so I'm not sure what I'm doing, but I have tried to work through this and I could use any help you can offer.</p>
  
  <pre><code>$start_date = $row["start_time"];
  
  for ( $i = 1; $i&lt;9; $i++) {
      $start_date= strtotime('+1 week', $start_date);
      $arr = array('id' =&gt; $row["course_id"],
          'title' =&gt; $row["course_name"],
          'start' =&gt; $start_date,
          'allDay' =&gt; false
      );
      array_push($result, $arr);
  }
  </code></pre>