get_post_modified_time

	}

	$wp_timezone = wp_timezone();

	if ( 'gmt' === $source ) {
		$time     = ( 'modified' === $field ) ? $post->post_modified_gmt : $post->post_date_gmt;
		$timezone = new DateTimeZone( 'UTC' );
	} else {
		$time     = ( 'modified' === $field ) ? $post->post_modified : $post->post_date;
		$timezone = $wp_timezone;
	}

	if ( empty( $time ) || '0000-00-00 00:00:00' === $time ) {
		return false;
	}

	$datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', $time, $timezone );

	if ( false === $datetime ) {
		return false;
	}

	return $datetime->setTimezone( $wp_timezone );
}

/**
 * Retrieve post published or modified time as a Unix timestamp.
 *
 * Note that this function returns a true Unix timestamp, not summed with timezone offset
 * like older WP functions.
 *
 * @since 5.3.0
 *
 * @param int|WP_Post $post  Optional. WP_Post object or ID. Default is global `$post` object.
 * @param string      $field Optional. Published or modified time to use from database. Accepts 'date' or 'modified'.
 *                           Default 'date'.
 * @return int|false Unix timestamp on success, false on failure.
 */
function get_post_timestamp( $post = null, $field = 'date' ) {
	$datetime = get_post_datetime( $post, $field );

	if ( false === $datetime ) {
		return false;