Using GroupBy to sort a list by year and month

Questions
1

I want so sort a news list by year and month, e.g.

January 2014:

item 1 

Item 2

February 2014

item 3

item 4

I'm struggling to do this in Razor using GroupBy:

I can group items by year:

 

 var yearGroups = newsOverview.Descendants("duhubCalendarItem").OrderBy("date desc").GroupBy("date.Year");

But I need to group them by year and month. Is it possible to have nested groups? Or specify year and month in the groupBy clause?

Thanks

Dan

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/47243-using-groupby-to-sort-a-list-by-year-and-month