How to format an UTC date to use the Z (Zulu) zone designator in php?

Question

I need to display and handle UTC dates in the following format:

2013-06-28T22:15:00Z

As this format is part of the ISO8601 stand

Answer 1

No, there is no special constant for the desired format. I would use:

$date->format('Y-m-d\TH:i:s\Z');

But you will have to make sure that the times you are using are really UTC to avoid interpretation errors in your application.