Changing the Displayed Value in a DataGrid

I am trying to modify the value that is displayed in a DataGrid cell after the user has entered or modified the existing value.  For example, if the user enters "5/6/12" I want the cell to display "05/06/2012" when the user exits the cell.  Here is the code that creates the column:

final TextInputCell fosterDateStartCell = new TextInputCell();

final Column<IFosterHistoryProxy, String> fosterDateStartColumn;

fosterDateStartColumn = new Column<IFosterHistoryProxy, String>(fosterDateStartCell) {

    @Override

    public String getValue(final IFosterHistoryProxy fosterHistory) {

        final String date = fosterHistory.getFosterDateStart();

        if (GLGWTUtil.isEmpty(date)) {

            return "";

        }

        return date.substring(4, 6) + "/" + date.substring(6, 8) + "/" + date.substring(0, 4);

    }

};

fosterDateStartColumn.setFieldUpdater(new FieldUpdater<IFosterHistoryProxy, String>() {

    @Override

    public void update(final int index, final IFosterHistoryProxy fosterHistory, final String value) {

        final String[] dateParts = value.split("/");

        if (dateParts.length != 3) {

            return;

        }

        final int month = Integer.valueOf(dateParts[0]);

        final int day = Integer.valueOf(dateParts[1]);

        final int year = Integer.valueOf(dateParts[2]);

        final String date = (year < 100 ? 2000 + year : year) + (month < 10 ? "0" : "") + month +

                            (day < 10 ? "0" : "") + day;

        getEditDTO(fosterHistory, ECacheUpdateType.Update).setFosterDateStart(date);

        final ViewData viewData = new ViewData(date.substring(4, 6) + "/" + date.substring(6, 8) +

                                               "/" + date.substring(0, 4));

        fosterDateStartCell.setViewData(fosterHistory.getFosterHistoryId(), viewData);

        fosterHistoryGrid.redraw();

    }

});

fosterDateStartColumn.setSortable(true);

fosterHistoryGrid.addColumn(fosterDateStartColumn, "Start Date");

fosterHistoryGrid.setColumnWidth(fosterDateStartColumn, "10ex");

The getValue() method is working well ... if the value in the proxy object is "20120506" then I see "05/06/2012" in the cell.  But the update() method is not showing the correct value ... if the user enters "5/6/12" then I do not see "05/06/2012" (the value in the cell is still "5/6/12" after the update() method has executed).  Note that the setFosterDateStart() method does not cause the update to be sent to the server; it simply sets the value in the editable proxy object.  Also note that the getFosterHistoryId() method returns the stable identifier value for the IFosterHistoryProxy object, and that the key provider for the selection model associated with the DataGrid is using that identifier.

Many thanks for any help!

Andy

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