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$timestamp = 1506086214;
// set the default timezone to use. Available since PHP 5.1
date_default_timezone_set('UTC');
// ISO 8601 (does NOT include microseconds)
echo date("c", $timestamp) . PHP_EOL;
// custom format e.g. 2017-09-23T01:08:36.6437128Z
echo date("Y-m-dTH:i:s.uZ", $timestamp) . PHP_EOL;
//快捷方法
echo gmdate("Y-m-dTH:i:s.000Z")