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<?php var_dump(\DateTimeImmutable::createFromFormat('U', '00000000'));
based on BfT2e
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "1970-01-01 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }
Output for hhvm-3.15.4
object(DateTimeImmutable)#1 (1) { ["data":"DateTimeImmutable":private]=> object(DateTime)#3 (3) { ["date"]=> string(26) "1970-01-01 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } }