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Javascript To Validate Or Compare Two Dates

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// Javascript to validate or compare two dates


function IsValidDate() {

            var dtFrom = R('<%=txtFrom.ClientId%>').value;
            var dtTo = R('<%=txtTo.ClientId%>').value;
            if ((dtTo == null || dtFrom == null) || (dtTo == '' || dtFrom == '') || (dtTo == undefined || dtFrom == undefined)) {
                alert('Please select proper start and end date');
                return false;
            }
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