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<?php $dt = new DateTime(null, new DateTimeZone('UTC')); var_dump(DateTime::ISO8601, $dt::ISO8601, constant(sprintf('%s::ISO8601', get_class($dt))));
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/koLuF on line 3 string(13) "Y-m-d\TH:i:sO" string(13) "Y-m-d\TH:i:sO" string(13) "Y-m-d\TH:i:sO"

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