如何在PHP中将时间戳转换为iso-8601和UTC？

Question

I am not sure how to convert timestamp into ISO-8601 and also apply UTC.
However, I am looking for following output: 2017-09-23T01:08:36.6437128Z ( Format = ISO-8601. Timezone = UTC)

I have tried couple of ways to get this but I am not getting it so anyone know how to get this. As this must be very quick and easy fix but I am missing something and that's the reason I am not getting this output.

Any help would be appreciated:) Thanks

Answer 1

First of all, your desired format is not ISO 8601 compliant because you're including microseconds.

Use date_default_timezone_set to get UTC and date to easily format a timestamp.

Demo: https://3v4l.org/aRKqi

$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-d\TH:i:s.u\Z", $timestamp) . PHP_EOL;

2017-09-22T13:16:54+00:00
2017-09-22T13:16:54.000000Z