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converting date formats

need a function to convert m-d-Y or Y-m-d

i want to run the function anytime a date variable is used & only modify the variable data IF it fits the format to be modified.

in layman's terms:
if( *date* == format m-d-Y){ convert to Y-m-d )
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Ray Paseur
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Ray Paseur
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Your question is a little hard to understand because clients have so many different ways of expressing dates.  Consider this: 03-05-2011.  Do you think that should be March 5 or May 3?  Would you want to convert 03-05-2011 but not convert 03/05/2011?  Would you want to not use ISO8601 formats for some reason?  Questions like that are lurking in the design that seems to underpin your question.  If you can give us a little more context and explanation we may be able to give you a better answer.  In the correct computer science methods, you would do something like this:

$s = '03-05-2011';
$t = strtotime($s);
if (!$t) die("$s is a bogus date string");
$d = date('Y-m-d', $t);
echo $d;