Date info in session from bkap date selection form

functions.php

<?php

function bkap_date_from_session_cookie( $date ) {
	if ( $date ) {
		if ( str_contains( $date, '/' ) ) {
			$d    = DateTime::createFromFormat( 'j/n/y', $date );
			$date = $d->format( 'Y-m-d' );
		}
	}
	return $date;
}
add_filter( 'bkap_date_from_session_cookie', 'bkap_date_from_session_cookie', 10, 1 );