ISO 8601 in PHP
The one that ends in ‘Z’
To get the zoneless ISO-8601 formatted date, use this format string:
date("o-m-d\Th:i:s\Z");
To get this:
2016-02-18T07:56:04Z
The one with the timezone
To get it with timezone, you can use the short formatting code:
date("c");
To get this:
2016-02-18T07:56:04+00:00