$time='2013-8-3';

$result=preg_match("/^[0-9]{4}(\-|\/)[0-9]{1,2}(\\1)[0-9]{1,2}(|\s+[0-9]{1,2}(|:[0-9]{1,2}(|:[0-9]{1,2})))$/",$time);

if($result)

    echo('正确的日期格式');

else

    echo('错误的日期格式');

SyntaxHighlighter.highlight();