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Not sure, but try F() expression
from datetime import timedelta
myModel.objects.annotate(
count=Count("my_string"),
sum1=Sum('my_date'),
sum2=Sum(F('my_date') + timedelta(days=1))
).values('my_string', 'count', 'sum1', 'sum2')
https://docs.djangoproject.com/en/dev/ref/models/queries/#f-expressions
Source:stackexchange.com