Hi @sayed.tabrez ,
Assuming you have already read the Data from the Excel as a Datatable, you can Check with the below Expression :
SecondHighestDate = DT.AsEnumerable.OrderByDescending(Function(x)CDate(x("YourBirthDateColumnName").ToString))(1).ToString
Here, SecondHighestDate
is of the Type String, and DT
is the Datatable variable.
Let us know if the above expression does not work.