function compareDateTime(frmtime,totime) { var date1 = new Date(frmtime); var date2 = new Date(totime); var diff = new Date(); alert(date1); alert(date2); diff = (date2.getTime()-date1.getTime()); if (diff<0) { alert("From Time cannot be later than To Time!"); return 0; } else if (diff==0) { alert("From Time cannot be equal with To Time!"); return 0; } else { return diff; } }