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$s = '2016-03-10 12:23:12';
$t = (1000+substr($s,0,4)).substr($s,4);
echo $t;
$s = '2016-03-10 12:23:12';
$t = explode('-', $s, 2);
$t[0] += 1000;
echo join('-', $t);
3016-03-10 12:23:12
$date = '2016-03-10 12:23:12';
$timestamp = strtotime($date);
$y = date('Y',$timestamp);
echo ($y+1000).date('-m-d H:i:s',$timestamp);