how to clear the dropdown check box and datepicker using javascript

clear section of dropdown( with and out check box inside) and datepicker -------------------------------------------------------------------------- function GetClearSelction() { $find('cbCustomer').clearSelection();--------> this for combo box var items = $find('cbCustomer').get_checkedItems(); var i = 0; while (i < items.length) {---> these five lines for combo box inside check box items[i].uncheck(); i++; } $find('cbZone').clearSelection(); this is for datepicker
------------------------ var fullDate = new Date() var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun","Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; var twoDigitMonth = ((fullDate.getMonth().length + 1) === 1) ? (fullDate.getMonth() + 1) : '0' + (fullDate.getMonth() + 1); var currentDate = fullDate.getDate() + " " + months[fullDate.getMonth()] + " " + fullDate.getFullYear(); document.getElementById("FrmDt_dateInput").value = currentDate; document.getElementById("ToDt_dateInput").value = currentDate; } this is button <input type="button" onclick="GetClearSelction();" value="Clear" />