<body onclick="">
<script>
a=Date.parse("1999-05-23 15:23:34".replace(/-/g,"/"))
b=Date.parse("2003-01-12 20:48:12".replace(/-/g,"/"))alert(b-a/1000)
</script>
<script>
a=Date.parse("1999-05-23 15:23:34".replace(/-/g,"/"))
b=Date.parse("2003-01-12 20:48:12".replace(/-/g,"/"))alert(b-a/1000)
</script>
<?
$date1 = "1999-05-23 15:23:34";
$date2 = "2003-01-12 20:48:12";
print strtotime($date2)-strtotime($date1);