I'm able to display dates in my custom dateformat (my cell renderer) but when inline editing starts in cell, date format is changed to for example "Tue Feb 14 00:00:00 CET 2012". This is nice if it comes to presentation but to input a date.
How to show & edit dates in "YY-MM-DD" format in all Date cells in every state?
TableCellRenderer
is for viewing, Try overwriting TableCellEditor
Here few examples you can find for CellEditor Concepts: Editors and Renderers