Hi Martin,

Above example works for the first time but it doesnt work for the second time .

Suppose, you have selected start date as 5/10/2020 and then prior to 5/10/2020 will not be visible for end date which is correct . but click again on end date and now it will not work ,it will show dates prior to start date .

We have removed date = null from the below code and its working for the second time click

{
columnKey: "END_DATE",
editorType: "datepicker",
editorOptions: {
itemSelected: function (evt, ui) {
endDate = $(this).igDatePicker("value");
},
dropDownListOpening: function (evt, ui) {
var BEGIN_DATE = $("#datePeriod").igGrid("getCellText", rowID, "BEGIN_DATE");
debugger;
if (date) BEGIN_DATE = date;
$(ui.editorInput[0]).datepicker("option", "minDate", new Date(BEGIN_DATE));
// date = null;  -- removed this line 
endDate = $(this).igDatePicker("value");
},
validatorOptions: {
required: true,
}
}

}

But, we need to make it null because its showing the same filtered criteria for start date (not greater than end date) after reopening the pop up  like I closed the pop up for the first time and clicked again on Add new row so it shows the old filtered criteria and start date will not allow to select dates which were greater than end date in previous selection. 

Where should we make it to null to work it for the second time ?