E10- Update EquipMeter Table

How to update “ReadingDate” column value in Erp.EquipMeter table. It is taking current date not back dated.

Code:
private void oTrans_adapter_BeforeAdapterMethod(object sender, BeforeAdapterMethodArgs args)
{
switch (args.MethodName)
{
case “Update”:
EpiDataView edv = (EpiDataView)oTrans.EpiDataViews[“MeterRead”];
System.Data.DataRow edvRow = edv.CurrentDataRow;
if(edvRow != null)
{
edvRow.BeginEdit();
edvRow[“ReadingDate”] = dteDate.Value;
edvRow.EndEdit();
}
break;
}

}