Pymongo: $match on only date portion of datetime Mongodb

mdb_date_query.py

import pymongo
from datetime import date

# TODO: Add your connection string, database name and collection name below
my_client = pymongo.MongoClient("...")
my_db = my_client["..."]
my_collection = my_db["..."]


def filter_by_date(query_date):
    """
    Filters a mongodb collection on the year, month and day of a date.
    As mongodb stores dates as datetimes this allows you to query the date while ignoring the time.
    
    Note: If you expect the count of returned documents to be very high you may prefer to edit this function to
    return the mongodb cursor so that it can be iterated over, rather than casting to a list.
    """
    date_field = '$my_date_field' #TODO: Update this to the name of the field your date is stored in
    
    return list(my_collection.aggregate([
        # TODO: You could add an initial match stage here if there are any other conditions you're filtering on
        {
            '$project': {
                '_id': 1,
                'month': {
                    '$month': date_field
                },
                'day': {
                    '$dayOfMonth': date_field
                },
                'year': {
                    '$year': date_field
                }
                # TODO: Project any other fields you need here
            }
        },
        {
            '$match': {
                'day': query_date.day,
                'month': query_date.month,
                'year': query_date.year
            }
        }
    ]))


# Example of code running
my_date = date.today()
my_filtered_documents = filter_by_date(my_date)
print(len(my_filtered_documents))