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<?php var_dump((new DateTimeImmutable('2008-03-01T13:00:00+00:00'))->format(DateTimeInterface::RFC3339));
Output for 8.1.29 - 8.1.30, 8.2.19 - 8.2.24, 8.3.5 - 8.3.12
string(25) "2008-03-01T13:00:00+00:00"
preferences:
53.23 ms | 406 KiB | 5 Q