Stumped by Third Day of Month problem

Posted on 16th Feb 2014 by admin

I am trying to build an algorithm that will essentially do this:
Code: [Select]$this_month = October
$third_sunday = CalculateThirdSunday(October)

if ( ( TodaysDate before $third_sunday ) | ( TodaysDate == $third_sunday )
do something
else CalculateThirdSunday(November)
do something else

So the sorta pseudo-code above should reveal that I want a function that will always take the current month and calculate the third Sunday. Then if it's on or before that third sunday do something. However if it is after the the third Sunday, then we will calculate the third sunday of next month and then do something.

I can calculate what the third sunday out from now() is quite trivially:

<?PHP echo date('l jS F (Y-m-d)', strtotime('third Sunday')); ?>

But anyone got any idea how to find the third sunday from the beginning of the month? I tried something like

<?PHP echo date('l jS F (Y-m-d)', strtotime('2009-10-01 +third Sunday')); ?>

but that appears to not work. It tells me the next sunday is in Feb

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