GroupTable -> Column : dateFormat doesn't work?

Hello!
I try to format a column via dateFormat e.g.:

…column id=“createdDate” dateFormat=“dd.MM.yy”…

but dateFormat shows no effect.
Thanks for ideas,
br
HP

ok, found a solution:

[column id=“createdDate”]
[formatter]
[date format=“dd.MM.yy”/]
[/formatter]
[/column]