converting any date having timezone to UTC

Question

I am working on converting any date having timezone to UTC.

i have offset i wants to convert UTC time from that particular time by adding/subs rating offset like +5300 can any one help me how write PHP code for the same.

I have tried following code :

$d = new DateTime('2010-01-31 20:30:00');
$d->modify('+5300 hours');
echo $d->format('Y-m-d H:i:s'), "\n";`

Answer 1

If the time stamp is 2010-01-31 20:30:00+5300, then you would want to do:

$d = new DateTime('2010-01-31 20:30:00');
$d->modify('-53 hours');

5300 stands for 53 hours, 0 minutes, not 5300 hours. Also you need to subtract that to get back to UTC, it is already ahead of UTC.