Date Validation in JavaScript

/**
 * End Date Validation
 * @returns {Boolean}
 */
function endDateCheck(){
    var startDatechk = $('#datepickerStart').val();
    var enddatechk = $('#datepickerEnd').val();
    if(startDatechk != ''){
        if(Date.parse(enddatechk) > new Date() || Date.parse(enddatechk) < Date.parse(startDatechk)){
            alert("End date should be in between the start date and current date");
            $('#datepickerEnd').val('');
            return false;
        }
    }else if(Date.parse(enddatechk) > new Date() ){
        alert("End date should be in between the start date and current date");
        $('#datepickerEnd').val('');
        return false;
    }
    $('#datepickerEnd').datepicker("hide");
    return false;
}

/**
 * Start Date Validation
 * @returns {Boolean}
 */
function startDateCheck(){
    var startDatechk = $('#datepickerStart').val();
    var enddatechk = $('#datepickerEnd').val();
    if(Date.parse(startDatechk) > new Date() || Date.parse(enddatechk) < Date.parse(startDatechk)){
        alert("Start date should be bofore current date and end date");
        $('#datepickerStart').val('');
        return false;
    }
    $('#datepickerStart').datepicker("hide");
    return false;
}



//Call this onLoad of the body

$(document).ready(function() {
var startYear = new Date().getFullYear() - 3;
var dateRange = startYear+":"+new Date().getFullYear();
 $('#datepickerStart').datepicker({
         yearRange: dateRange,
        changeMonth: true,
        changeYear: true,
        showOn : 'button',
        buttonImage : '/dlrmap/images/icons/calendar.gif',
        buttonImageOnly : true
    });
   
    $('#datepickerEnd').datepicker({
           yearRange: dateRange,
        changeMonth: true,
        changeYear: true,
        showOn : 'button',
        buttonImage : '/dlrmap/images/icons/calendar.gif',
        buttonImageOnly : true
    });
});


//Use <script src='${pageContext.request.contextPath}/resources/jquery-ui-1.8.17.custom.min.js'></script>