Django database query: How to filter objects by date range?

I've got a field in one model like

class Sample(models.Model):
    date = fields.DateField(auto_now=False)

Now, I need to filter the objects by a data range, for example, all the objects that has date between 1 Jan 2011 to 31 Jan 2011?

Thanks for your help!

Use

Sample.objects.filter(date__range=["2011-01-01", "2011-01-31"])

Or if you are just trying to filter month wise:

Sample.objects.filter(date__year='2011', 
                      date__month='01')

Edit

As lazerscience said, if you want a queryset which excludes the specified range ends you should consider his solution, which utilizes gt/lt (greater-than/less-than).