Some date() timestamp() mt_time() troubble :)

[Ellingsen]

Anyone kind enough to help me with this? i've searched trough sites and forums for it, but seems hard to find. If i have a week number of a year, like date('W Y'), and i need to find the date of the monday in that week, say week 28 2006, what date was monday? anyone got some info on this? all help appriciated

[Barand]

I don't know any php function that accepts week as input to give date so you need to calculate it yourself

 

Here's one way

 

<?php


function MondayOfWeekN($input)   {
        list ($w, $y) = explode (' ', $input);

        $day1 = mktime(0,0,0,1,1,$y);
        // what day was it?
        $dow = date('w', $day1);
        // get date of first Monday
        $offset = ($dow+6)%7;
        $firstMonday = strtotime ("-$offset days", $day1);

        /**
        * now we know date of first monday
        * the Nth monday is that date + (N-1) * 7 days
        */
        $n = ($w - 1) * 7;
        return date ('l jS F, Y', strtotime("+$n days", $firstMonday));
}

echo MondayOfWeekN ("28 2006");   // --> Monday 3rd July, 2006
?>