Python datetime.replace() 在上传到 Firebase Firestore 时表现异常

Question

为了测试，我部署了一个Firebase云函数。当这个函数被调用时，它会在我的Firestore集合中添加一个文档，里面有两个字段，分别包含两个时间。

@https_fn.on_call(region='europe-west1', vpc_connector='connector1', vpc_connector_egress_settings=options.VpcEgressSetting('ALL_TRAFFIC'))
def testing(req: https_fn.CallableRequest):
    firestore_client: google.cloud.firestore.Client = firestore.client()
    visit_collection = firestore_client.collection('visits')
    visit_collection.add(
        {
            'test1': datetime.now().astimezone(),
            'test2': datetime.now().replace(hour=0, minute=0, second=0, microsecond=0).astimezone(),
        },
        'test'
    )

在Firebase控制台的Cloud Firestore中查看文档内容时，我期望文档中字段的值是这样的（如果时间是19:50的话）：

test1: 23 March 2024 at 19:50:00 UTC+1
test2: 23 March 2024 at 00:00:00 UTC+1

但是，我在文档中看到的是：

test1: 23 March 2024 at 19:50:00 UTC+1
test2: 23 March 2024 at 01:00:00 UTC+1

Answer 1

我用pytz这个包解决了这个问题：

import pytz
from datetime import datetime, time
from firebase_functions import https_fn, options
from firebase_admin import initialize_app, auth, firestore
import google.cloud.firestore

@https_fn.on_call(region='europe-west1', vpc_connector='connector1', vpc_connector_egress_settings=options.VpcEgressSetting('ALL_TRAFFIC'))
def testing(req: https_fn.CallableRequest):
    firestore_client: google.cloud.firestore.Client = firestore.client()
    visit_collection = firestore_client.collection('visits')
    brussels_tz = pytz.timezone('Europe/Brussels')
    current_datetime = datetime.now(brussels_tz)
    current_date = current_datetime.date()
    midnight_brussels = datetime.combine(current_date, time())
    midnight_brussels = brussels_tz.localize(midnight_brussels)
    visit_collection.add(
        {
            'test1': current_datetime,
            'test2': midnight_brussels,
        },
        'test'
    )