protected function humanDateToIso($humandate)
    {
        $datetime = \DateTime::createFromFormat( $this->format, $humandate);
        if (!$datetime) return null;

        $humandate = $datetime->format('Y-m-d');
        return $humandate;
    }
protected function humanDateToIso($humandate)
    {
        $datetime = \DateTime::createFromFormat( $this->format, $humandate);
        if (!$datetime) return null;

        $humandate = $datetime->format('Y-m-d');
        return $humandate;
    }
protected function humanDateToIso ( $ humandate ) { $ datetime = \ DateTime :: createFromFormat ( $ this -> format , $ humandate ) ; if ( ! $ datetime ) return null ; $ humandate = $ datetime -> format ( 'Y-m-d' ) ; return $ humandate ; }
convert from current user format to iso date
convert from current user format to iso date