wp-includes/SimplePie/src/Misc.php:1744$dtstringint|false public static function parse_date(string $dt) { $parser = \SimplePie\Parse\Date::get(); return $parser->parse($dt); }2 changes between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$dt retyped from untyped to string.verified against sourcenone to int|false.verified against sourcesrc/wp-includes/SimplePie/src/Misc.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.