wp_resolve_post_date( string $post_date, string $post_date_gmt ): string|false

Source

function wp_resolve_post_date( $post_date = '', $post_date_gmt = '' ) {
	// If the date is empty, set the date to now.
	if ( empty( $post_date ) || '0000-00-00 00:00:00' === $post_date ) {
		if ( empty( $post_date_gmt ) || '0000-00-00 00:00:00' === $post_date_gmt ) {
			$post_date = current_time( 'mysql' );
		} else {
			$post_date = get_date_from_gmt( $post_date_gmt );
		}
	}

	// Validate the date.
	preg_match( '/^(\d{4})-(\d{1,2})-(\d{1,2})/', $post_date, $matches );

	if ( empty( $matches ) || ! is_array( $matches ) || count( $matches ) < 4 ) {
		return false;
	}

	$valid_date = wp_checkdate( $matches[2], $matches[3], $matches[1], $post_date );

	if ( ! $valid_date ) {
		return false;
	}
	return $post_date;
}

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