Error on import row - 'The added or subtracted value results in an un-representable DateTime.'

I'm loading a dataset through a stored procedure, and my dataset has 2 dateTime fields.  My stored procedure runs in a different class, then I copy that dataset into my form's dataset.  The first time it loads, everything is fine.  However, I need to be able to reload the data at the user's request.  For the reload, I clear the dataset table using DataSet1.Tables("Task").Clear(), then run loadTasks() (see below).  When it runs loadTasks the 2nd time, I am getting an error 'The added or subtracted value results in an un-representable DateTime.  Parameter name: t'.

Why does it work the first time and not the 2nd?  I haven't modified the data at this point, it's exactly the same.  Do I need to reinitialize the dataTable somehow?Start Free Trial

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Private Sub loadTasks()
        Dim dsTempSchedule As New DataSet()
 
        objMachine.getSchedule()
        dsTempSchedule = objMachine.ScheduleList
 
        For Each schedule In dsTempSchedule.Tables(0).Rows
            DataSet1.Tables(1).ImportRow(schedule)
        Next
    End Sub