Question

我要向表单传递两个朴素的日期。然后使用pytz确保时区设置为EST。但是，这会导致错误。我猜这是由于DST问题引起的。日期和夏令时令人困惑。有人可以启发我如何制作“ DST证明”吗？

from rest_framework import serializers
from datetime import datetime
import pytz


class SearchForm(serializers.Serializer):
    start_date = serializers.DateField(required=True)
    end_date = serializers.DateField(required=False)

    def save(self):
        # Doesn't actually save, 
        start_date = self.validated_data['start_date']
        end_date = self.validated_data['end_date']

        # Convert dates to EST timezone
        est = pytz.timezone('America/New_York')
        start_date = datetime.combine(start_date, time.min).astimezone(est)
        end_date = datetime.combine(end_date, time.max).astimezone(est)

        print(f'Start date: {start_date} => {start_date.tzinfo}')
        print(f'End date: {end_date} => {end_date.tzinfo}')

        assert start_date.tzinfo == end_date.tzinfo

        # Filter based on timeframe
        qs = self.filter_timeframe(qs, start_date, end_date)

        return SearchSerializer(qs, many=True)

将start_date传递为“ 2018-11-1”，将end_date传递为“ 2018-11-5”将得到AssertionError。打印日期将导致：

Start date: 2018-11-01 00:00:00-04:00 => America/New_York
End date: 2018-11-05 23:59:59.999999-05:00 => America/New_York

问题是为什么end_date时区-05:00而不是-04:00像start_date一样？

Answer 1

America / New_York与EST不同。前者根据夏令时调整。后者固定为东部标准时间。使用：

est = pytz.timezone('EST')

pytz时区DST问题

1 个答案: