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i've got users coming in from a different site and i'm getting that site to send across their timezone in a standard 'tz' format Antarctica/Casey Antarctica/Davis Antarctica/DumontDUrville Antarctica/Macquarie Antarctica/Mawson Antarctica/McMurdo How do i verify that this 'string' coming in is a VALID timezone entry? this is what i'm doing $script_tz = date_default_timezone_get(); if(!date_default_timezone_set($specifiedTimeZone)) { date_default_timezone_set($script_tz); $errormessage = "Invalid TimeZone"; return; } date_default_timezone_set($script_tz); but i dont like it - seems kludgy. testing it out: Test1 $test1 = 'America/New_York'; $test2 = 'junk'; $start = microtime(true); for($i=1;$i<10000;$i++) { if (in_array($test1, DateTimeZone::listIdentifiers())) {}else {} if (in_array($test2, DateTimeZone::listIdentifiers())) {}else {} } $end = microtime(true); echo $end-$start; ?> 9.7208099365234 Test2 <?php $test1 = 'America/New_York'; $test2 = 'junk'; error_reporting(0); $start = microtime(true); for($i=1;$i<10000;$i++) { $script_tz = date_default_timezone_get(); if(!date_default_timezone_set($test1)) { date_default_timezone_set($script_tz); } else date_default_timezone_set($script_tz); $script_tz = date_default_timezone_get(); if(!date_default_timezone_set($test2)) { date_default_timezone_set($script_tz); } else date_default_timezone_set($script_tz); } $end = microtime(true); echo $end-$start; ?> 0.25762510299683

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