来自UTC偏移的Pytz时区

Question

我正在使用Facebook的图形API与Python.对于any user_id,它将用户的时区指定为浮点数,表示与UTC的偏移量.

示例:对于印度的某个人,它给出5.5

我将如何转化为有效的此timezone类似Asia/Kolkata？

我已经调查过,pytz但没有找到任何合适的方法来做到这一点.

Answer 1

通过查看所有条目,您可以找到与Olson数据库中最后一个条目的给定偏移(忽略DST)匹配的所有时区.

码:

import datetime as dt
import pytz

def possible_timezones(tz_offset, common_only=True):
    # pick one of the timezone collections
    timezones = pytz.common_timezones if common_only else pytz.all_timezones

    # convert the float hours offset to a timedelta
    offset_days, offset_seconds = 0, int(tz_offset * 3600)
    if offset_seconds < 0:
        offset_days = -1
        offset_seconds += 24 * 3600
    desired_delta = dt.timedelta(offset_days, offset_seconds)

    # Loop through the timezones and find any with matching offsets
    null_delta = dt.timedelta(0, 0)
    results = []
    for tz_name in timezones:
        tz = pytz.timezone(tz_name)
        non_dst_offset = getattr(tz, '_transition_info', [[null_delta]])[-1]
        if desired_delta == non_dst_offset[0]:
            results.append(tz_name)

    return results

测试代码:

print(possible_timezones(5.5, common_only=False))

结果:

['Asia/Calcutta', 'Asia/Colombo', 'Asia/Kolkata']