I want to build a Kendo UI Grid with format date dd//MM/yyyy. However, all questions that I found about this, it were resolved with code Format(\"{0:d}\");. So,
I don't know about Kendo UI but it looks to me like you want to pass a string formatted date rather than a DateTime object.
The /Date(...)/
output looks like a JSON formatted date from .Net.
I would convert the date to a string using somthing like myDateTime.ToString("dd/MM/yyyy");
before passing it to the control.