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Need function to find previous thursday OR friday

Posted on 2008-11-03
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Last Modified: 2010-05-18
Hi :-)
I need a function that will return the date for the previus Thursday OR Friday (decided from a $parameter).

The date returned has to be at least 8 days before today - I will be calling this function twice to get the last full week going from friday -> thursday next week.

So today I would need to find 2 dates - Friday 10/24 and Thursday 10/30 - then use them later to perform a query.

I was building this function, where I owuld send 5 for thursday and 6 for friday - but it don't really work ::

function getStartDates($day=6){
      $dow = date("w"); //monday == 1
      $offset = ($dow -1);
      if ($offset <0) {
            $offset = $day;
      }
      return date("Ymd", mktime(0,0,0,date('m'), date('d')-$offset-1, date('Y') ));
}

Hope that some of you guys can help me out here :-)
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Question by:trg_dk
  • 3
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Accepted Solution

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lpxtech earned 500 total points
ID: 22865481
Here ya go. php built in function strtotime();
<?php echo date('m/d/Y', strtotime("last Thusday")); ?>
<?php echo date('m/d/Y', strtotime("last Friday")); ?>

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Expert Comment

by:lpxtech
ID: 22865485
By the way, the strtotime() function returns a unix timestamp which is why I wrapped it in a date() tag The above code will echo 10/30/2008 and 10/31/2008
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LVL 16

Expert Comment

by:alain34
ID: 22865500
Hello trg_dk,

You should look at the strtotime function http://uk3.php.net/manual/en/function.strtotime.php

For example

$dateLastThursday = date("Y-m-d",strtotime("last Thursday"));


Regards,

alain34
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LVL 2

Author Comment

by:trg_dk
ID: 22865521
:-O OK this just blows my head clean off :-)

Thank you so much - feel I should have found this on php.net ??
Are these function undocumented or did I fail miserably in the "Googling" categoru ?

Thanks again,
Mark
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LVL 6

Expert Comment

by:lpxtech
ID: 22865575
The php manual should be your best friend. :-) If all else fails, check php.net.

Glad I could help.
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