Create a small function to extract just the date:
def extract_date(entity):
'extracts the starting date from an entity'
return entity.start_time.date()
Then you can use it with itertools.groupby
:
from itertools import groupby
entities = Entity.objects.order_by('start_time')
for start_date, group in groupby(entities, key=extract_date):
do_something_with(start_date, list(group))
Or, if you really want a list of lists:
entities = Entity.objects.order_by('start_time')
list_of_lists = [list(g) for t, g in groupby(entities, key=extract_date)]
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