jQuery Grid Plugin - jqGrid

I cannot get grips on the date localisation in jqgrid.

My locale is 'nl-BE' which uses the 'dd/mm/yyyy' date-format.

My web.api generates ISO8601Long dates.

Parameters are set as follows :

datefmt: 'ISO8601Long',

formatter: 'date',

formatoptions: { srcformat: 'ISO8601Long', newformat: 'd/m/Y'}

The dates are parsed allright on the screen, sorting works OK
BUT  editing and posting reverses day and month.

Please enlighten us and make us clear how the output-dates are formatted.

Mork