Convert current server time to ISO 8601

I must convert the server current time to this format:


I think this is an ISO 8601 (even if I don't understand what are the final numbers, supposedly microseconds).

How can I do? Any help is welcome


The final numbers are the microseconds. It is easy to output a given DateTime object $d in this format:

echo $d->format('Y-m-d\TH:i:s.u');

It is not so easy, to get the current timestamp including microseconds, because constructing it with now only gets whole seconds. You could go this way and append the microseconds manually:

echo date('Y-m-d\TH:i:s') . substr((string) microtime(), 1, 7);
// 2016-03-23T14:55:25.535678

See doc for microtime() and DateTime.

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