Convert time in PHP from gmt offset

Question

For example i have a time string of "11:00" and and gmt offset string of "+02:00".

How can i combine the two to make the conversion in PHP?

Here is my current code:

$time = $row->time;

//Get users gmt setting

$timezone = $this->_get_gmt();

//calculate correct time here

$time = ; //whatever i have to do.

All answers appreciated.

Answer 1

$date = DateTime::createFromFormat('H:i P', '11:00 +02:00');
$date->setTimeZone(new DateTimeZone('GMT'));
echo $date->format('H:i');

Demo

This:

1. Creates a DateTime object with the time and offset
2. Converts the timezone to GMT
3. Echo's out the time in GMT