How can I get next week dates?
<p><strong>Problem</strong></p>

<p>I'm using the below code to get the next week's date and second week's date. It works fine for first few records but later it starts giving year <strong>1970</strong>.</p>

<p>If the start date is <strong>12/01/2013</strong> it shows me coorect result that is:</p>

<p>Next week: <strong>19/01/2013</strong></p>

<p>Second week: <strong>26/01/2013</strong></p>

<p>but in another record where the date is <strong>16/05/2013</strong> it shows the below</p>

<p>Next week: <strong>08/01/1970</strong></p>

<p>Second week: <strong>15/01/1970</strong></p>

<p>Please guide me where I might be going wrong ?</p>

<p><strong>Code</strong></p>

<pre><code>    //Date of when game started
    $starts_on = '12/01/2013';    

    //Next week's date from start date
    $next_week = strtotime(date("d/m/Y", strtotime($starts_on)) . "+1 week");
    $next_week = date('d/m/Y', $next_week);

    //Second week's date from start date
    $second_week = strtotime(date("d/m/Y", strtotime($starts_on)) . "+2 week");
    $second_week = date('d/m/Y', $second_week);

    echo $starts_on.", ".$next_week.", ".$second_week;
</code></pre>
