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run code in 200+ php & hhvm versions
<?php var_dump(\DateTimeImmutable::createFromFormat('Y-m-d H:i:s.v', (new datetime('2019-01-06 12:34:56.789'))->format('Y-m-d H:i:s.v')));

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for branch php-master
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2019-01-06 12:34:56.789000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for branch php-master+opcache
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2019-01-06 12:34:56.789000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for branch php-master+jit
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2019-01-06 12:34:56.789000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page