<?php

// https://www.php.net/manual/en/datetimeimmutable.construct.php

// Correct
new DateTimeImmutable(timezone: new DateTimeZone('UTC'));
// Wrong
new DateTimeImmutable(tz: new DateTimeZone('UTC'));

// https://www.php.net/manual/en/datetimezone.construct.php

// Correct
new DateTimeZone(timezone: 'UTC');
// Wrong
new DateTimeZone(tz: 'UTC');

// See example from:
// https://3v4l.org/gsj5r

<?php

new DateTime(timezone: new DateTimeZone('UTC'));