ordering inside regroup

Hi, I'm new to django that's why the tittle may says something stupid.
I was asked to write small application to group products with
producers. OK now the problem. Problem is ordering. I use "regroup" to
make:

Producer 1
product 1
product 2
Producer 2
product 1
Producer 3
product 1

but I have to order this "structure" by the date of added product
( newer first ) so if I add to this : product 2 for Producer 3 it
should look like this :

Producer 3
product 1
product 2
Producer 1
product 1
product 2
Producer 2
product 1

so, is it possible to do something like this with "regroup" ?

I add that in my model, fields with DateTime are only in product.

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