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<?php function so_validate_date( $date, $format ) { $d = DateTime::createFromFormat( "!$format", $date ); return $d && $d->format( $format ) == $date; } echo so_validate_date('2011-02', 'Y-m') ? 'true' : 'false';
Output for git.master, git.master_jit, rfc.property-hooks
true

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