wp-includes/class-wp-locale.php:373Retrieves translated version of meridiem string.
$meridiemstringstring public function get_meridiem( $meridiem ) { return $this->meridiem[ $meridiem ]; }Introduced in 2.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-locale.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.