php convert datetime to UTC

Question

I am in need of an easy way to convert a date time stamp to UTC (from whatever timezone the server is in) HOPEFULLY without using any libraries.

Answer 1

Use strtotime to generate a timestamp from the given string (interpreted as local time) and use gmdate to get it as a formatted UTC date back.

Example

As requested, here’s a simple example:

echo gmdate('d.m.Y H:i', strtotime('2012-06-28 23:55')); 

Answer 2

Using DateTime:

$given = new DateTime("2014-12-12 14:18:00"); echo $given->format("Y-m-d H:i:s e") . "\n"; // 2014-12-12 14:18:00 Asia/Bangkok  $given->setTimezone(new DateTimeZone("UTC")); echo $given->format("Y-m-d H:i:s e") . "\n"; // 2014-12-12 07:18:00 UTC