check if start date is greater than end date

check_date.js

function checkTime() {
        start = $("#startDate").val();
        end = $("#endDate").val();
        
        if((Date.parse(start) > Date.parse(end))) {
            $("#startDate").focus();
            alert('Incorrect Start time and End time');
            return false;
        }else{
            return true;
        }
    }