dt1 = document.getElementById('startmonth').value+'/'+document.getElementById('startday').value+'/'+document.getElementById('startyear').value; dt2 = document.getElementById('endmonth').value+'/'+document.getElementById('endday').value+'/'+document.getElementById('endyear').value; dt2 = new Date(dt2); dt1 = new Date(dt1); alert(dt1); alert(dt2); if ( dt2 > dt1 ){ alert ("End date is less than start date."); return false; }