how to compare date and time in php/ mysql -


i need compare date , time in php/mysql have application , server application needs connect server check new entries database. server receives datetime string application done here

simpledateformat dateformat = new simpledateformat("yyyy/mm/dd hh:mm:ss"); calendar cal = calendar.getinstance(); string time = dateformat.format(cal.gettime());

the server receives data here

f (isset($_get["time"]) || isset($_get["user_id"])) { $time = $_get['time']; $u_id = $_get['user_id']; $timestr=date('y-m-d h:i:s',strtotime($time));  $result = mysql_query("select max(created_at)from room"); $max_time = mysql_result($result, $row); $dbmax_time = date('y-m-d h:i:s',strtotime($max_time));

and comparison needs done here

if ($dbmax_time> $timestr) {     $newrooms = mysql_query("select * room created_at> cast($timestr time)"); }

how go confused on how compare please me fix it.

just comparing 2 timestamps suffice:

$t1 = strtotime($time); $t2 = strtotime($max_time);  if($t1 > $t2) { .. }

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