Entry.objects.filter(pub_date__month=7) doesn't work with Django 1.8

[lxm]

I create a class named Entry,like this:

class Entry(models.Model):

    pub_date = models.DateTimeField()

this data table named Entry have one record:

• pub_date = '2015-7-14 xx:xx:xx'
  

then,I excute 'Entry.objects.filter(pub_date__year=2015)' in shell,this will return right result,
but when I excute 'Entry.objects.filter(pub_date__month=7)',this return empty list.

[Bill Freeman]

What does the following say?

   Entry.objects.filter(pub_date__year=2015)[0].pub_date.month

If it says 7, then its time to delve into the generated SQL for the month query.

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