from django.db.models import Q
datafilter = Q()
for i in range(1, now.day + 1):
    datafilter = datafilter | Q(publish_date__day=i)
datafilter = datafilter & Q(publish_date__month=now.month)
posts = TodaysObject.objects.filter(datafilter)
Фильтр дат Django по дням месяца