So minor, barely worth reporting, but best to get it perfect:
eachCell: function(cell, ci, ri, column, rowData)
{
....
cell["format"] = "dd/mm/yyyy hh:mm";
}
When I open Excel, the cells have a custom format as 'dd\/mm\/yyyy hh:mm' and not 'dd/mm/yyyy hh:mm'
It all works fine, it's just the escape character should not be included.