wp-includes/class-wp-locale.php:394Registers date/time format strings for general POT.
public function _strings_for_pot() { /* translators: Localized date format, see https://www.php.net/manual/datetime.format.php */ __( 'F j, Y' ); /* translators: Localized time format, see https://www.php.net/manual/datetime.format.php */ __( 'g:i a' ); /* translators: Localized date and time format, see https://www.php.net/manual/datetime.format.php */ __( 'F j, Y g:i a' ); }Introduced in 3.6.0. 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.