Here

date.php

<?php
	function formatDate($date) {
		$date	= preg_replace('/:|T|\.|\+/', '-', $date);
		$p 		= explode('-', $date);
		
		foreach ($p as $index => &$part) {
			if ($index == 6) {
				$part .= str_repeat('0', 7 - strlen($part));
			} else {
				$part = strlen($part) < 2 ? 0 . $part : $part;
			}
		}
		
		return "$p[0]-$p[1]-$p[2]T$p[3]:$p[4]:$p[5].$p[6]+$p[7]:$p[8]";
	}