python - How to query for entity commited yesterday by DateTimeProperty() -

i have calendar model records number of contributions users make per day:

class calmodel(db.model):     user = db.referenceproperty(usermodel, collection_name = "calendar")     date = db.datetimeproperty(auto_now_add = true)     contrib = db.integerproperty(required = true) 

i want query calmodel entity date attribute yesterday. how specify datetime object day yesterday? (the strftime format default)

something goes like:

cal = calmodel.all().filter("date", datetimeobject).get() 

figured out.

yesterday = datetime.today() - timedelta(1) query = calmodel.all().ancestor(calendar_key()).filter("user", user).filter("date", yesterday).get()