adding 1 week to the existing date variable in php
<p>i write the code for adding a 12 weeks to the saturday and stored in a variable,now i want to take another variable to add 1 week for the variable that stored in 12 weeks.i wrote it,but it shows error msg  with the "1970/jan/08" date.
i write the code as </p>

<pre class="lang-php prettyprint-override"><code>$month = 2;
$year = 2012;
$saturday = strtotime('First Saturday '.date('F o',
    mktime(0,0,0, $month, 1, $year)));
echo date('Y/M/d', $saturday);
echo "&lt;br/&gt;";
$season1 = strtotime ( '+12 week' , $saturday);
$season1= date ( 'Y/M/d' , $season1 );
echo $season1;
echo "&lt;br/&gt;";
echo "&lt;br/&gt;";
$abc = strtotime ('+1 week' , $season1);
$abc = date ('Y/M/d', $abc);
echo "&lt;br/&gt;";
echo $abc;
</code></pre>

<p>in $abc variable i got the error.can any one help me to sort out this,thanks in advance</p>
