jQuery Grid Plugin - jqGrid

Hi,

Is it possible to assign more than one format to a cell?

I have a cell, that i need the following formatting on:

 1) The built-in "date" format, to display my date as 'yyyy-mm-dd'; and then also

 2) I have written a custom format function to display dates in red if the date is in the past.

How do I specify in the col model to use both formats at once?

Thanks!