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    <p>this works perfect!!! phpfiddle <a href="http://phpfiddle.org/main/code/0zy-7nh" rel="nofollow">here</a></p> <pre><code>&lt;?php // start and end must be timestamps !!!! $start = 1346976000; // Thu 2012-09-06 $end = 1348704000; // Tue 2012-09-26 // generate the weeks $weeks = generateweeks($start, $end); // diaplay the weeks echo 'From: '.fDate($start).'&lt;br&gt;'; foreach ($weeks as $week){ echo fDate($week['start']).' '.fDate($week['end']).'&lt;br&gt;'; } echo 'To: '.fDate($end).'&lt;br&gt;'; /* outputs this: From: Thu 2012-09-06 Thu 2012-09-06 Sun 2012-09-09 Mon 2012-09-10 Sun 2012-09-16 Mon 2012-09-17 Sun 2012-09-23 Mon 2012-09-24 Wed 2012-09-26 To: Wed 2012-09-26 */ // $start and $end must be unix timestamps (any range) // returns an array of arrays with 'start' and 'end' elements set // for each week (or part of week) for the given interval // return values are also in timestamps function generateweeks($start,$end){ $ret = array(); $start = E2D($start); $end = E2D($end); $ns = nextSunday($start); while(true){ if($ns&gt;=$end) {insert($ret,$start,$end);return $ret;} insert($ret,$start,$ns); $start = $ns +1; $ns+=7; } } // helper function to append the array and convert back to unix timestamp function insert(&amp;$arr, $start, $end){$arr[] = array('start'=&gt;D2E($start), 'end'=&gt;D2E($end));} // recives any date on CD format returns next Sunday on CD format function nextSunday($Cdate){return $Cdate + 6 - $Cdate % 7;} // recives any date on CD format returns previous Monday on CD format // finaly not used here function prevMonday($Cdate){return $Cdate - $Cdate % 7;} // recives timestamp returns CD function E2D($what){return floor($what/86400)+2;} // floor may be optional in some circunstances // recives CD returns timestamp function D2E($what){return ($what-2)*86400;} // 24*60*60 // just format the timestamp for output, you can adapt it to your needs function fDate($what){return date('D Y-m-d',$what);} </code></pre>
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    1. POFind weekly periods (starting on a Monday) for a month
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