Getting time difference between two times in PHP [duplicate]

Question

Possible Duplicate:
How to get time difference in minutes in PHP

I am working on an attendance table to calculate the late and very late employees. I am storing the login time in the table (Type: time). I am able to get the time from the database and i would like to show the time difference in the separate column.

i.e., if employee logged on or before 09:00:59, then its right time and the time diff should be shown as null. If he logs in after the time i.e, 09:01:00 or later the time difference should be 00:00:01. Like wise i need to calculate the differences in time.

One time is constant i.e., 09:00:59 and another one i am getting from database table. Need to get diff between both. I am working in PHP. Hope my question is clear.

Thank you in Advance.

Answer 1

You can use strtotime() for time calculation. Here is an example:

$checkTime = strtotime('09:00:59'); echo 'Check Time : '.date('H:i:s', $checkTime); echo '<hr>';  $loginTime = strtotime('09:01:00'); $diff = $checkTime - $loginTime; echo 'Login Time : '.date('H:i:s', $loginTime).'<br>'; echo ($diff < 0)? 'Late!' : 'Right time!'; echo '<br>'; echo 'Time diff in sec: '.abs($diff);  echo '<hr>';  $loginTime = strtotime('09:00:59'); $diff = $checkTime - $loginTime; echo 'Login Time : '.date('H:i:s', $loginTime).'<br>'; echo ($diff < 0)? 'Late!' : 'Right time!';  echo '<hr>';  $loginTime = strtotime('09:00:00'); $diff = $checkTime - $loginTime; echo 'Login Time : '.date('H:i:s', $loginTime).'<br>'; echo ($diff < 0)? 'Late!' : 'Right time!'; 

Demo

Check the already-asked question - how to get time difference in minutes:

Subtract the past-most one from the future-most one and divide by 60.

Times are done in unix format so they're just a big number showing the number of seconds from January 1 1970 00:00:00 GMT

Answer 2

You can also use DateTime class:

$time1 = new DateTime('09:00:59'); $time2 = new DateTime('09:01:00'); $interval = $time1->diff($time2); echo $interval->format('%s second(s)'); 

Result:

1 second(s)