jQuery Grid Plugin - jqGrid

Hi,

I've got a datetime column in a 3.5 grid using cell editing. I'm trying to get validation happening and I have the following column definition:

{ name: "DTField", index: "DTField", label:"DTField", key: false, hidden: false, width: 140, sortable: true, datefmt:"dd/mm/yyyy H:i", resizable: true, editable: true, sorttype: "date", editrules:{required:true ,date:true}, formatter: "date", formatoptions:{mask: 'dd/mm/yyyy H:i'} , editoptions: { size: 20, dataInit: function(elem) { pickdatetime(elem,true); }} },

The part that doesn't work is the H:i bit. I can get this to work if I only have a date and I remove the H:i from the format and mask. My datetime picker is returning the date and time in a string of 27/08/2009 11:12 and that is getting rejected (error message comes up after edit) by the 'dd/mm/yyyy H:i' format. 

Am I doing something wrong? I know I can remove the "date:true" param and then any datetime will be accepted, however I would really like to have the validation on.

Thanks,

Jo