Comparing two ISO8601 dates strings in PHP
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Published on 2011-02-23T22:47:02Z
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2011/02/23
23:25 UTC
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I need to compare (actually rank/sort) dates in a PHP script. The dates are ISO-8601 Date format i.e.
YYYY-MM-DD
I wrote a comparison function which splits the dates and compares by year/month/day. However, it seems this may be overkill and I could just as easily done a simple string comparison like:
if ($date1 < $date2)
// do something
elseif( $date1 > $date2)
//do something else
else
//do yet another thing
Is my assumption about (ISO-8601) Date string comparison correct - i.e. can I get rid of my function (to save a few clock cycles on the server), or is it safer to explicity do the comparison in a custom function?
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