Reset button

Hello.

Please try to use code like this for clearing selected dates in calendar:

        var inst = jQuery.datepick._getInst( jQuery( 'div[id^="calendar_booking"]' ).get(0) );
        inst.dates = [];
        jQuery.datepick._notifyChange(inst);
        jQuery.datepick._adjustInstDate(inst);
        jQuery.datepick._showDate(inst);
        jQuery.datepick._updateDatepick(inst);
        jQuery('textarea[id^="date_booking"]').val('');

Please note, you can use this code at the page, where inserted one booking form for specific booking resource.

Kind Regards.