Django filter by week
There's no predefined query field lookup that can do this for weeks.  I'd either reuse code from the WeekArchiveView date-based generic view, or ideally directly subclass it - it already handles the filtering.
Is there a way to easily filter Date objects by week? Basically I want to do something like 
items= RelevantObject.objects.filter(date__week=32)
I've found that it's possible to do this for year and month, but it doesn't seem like the capability for week is built in. Is there a "right" way to do this? It seems like it shouldn't be too difficult. 
Thanks