In Telerik extension grid, ClientGroupFooterTemplate always gives 0 for max min operation on dates

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MVC

Telerik

In Telerik extension grid, ClientGroupFooterTemplate always gives 0 for max min operation on dates

It's working fine for int types. But it's always returning 0 for date types. Here is my code:

columns.Bound(column.DataType, column.ColumnName).Aggregate(a => a.Max()).GroupFooterTemplate(result => "Max : " + result.Max.Format("{0:MM/dd/yyyy}")).Format("{0:MM/dd/yyyy}").ClientGroupFooterTemplate("Max : <#= Max #>");

Please help. Thanks