从本地转换为 UTC 时区 [英] converting from local to utc timezone

问题描述

我正在尝试制作一个函数，该函数接受一个时间对象并将其转换为 UTC 时间.下面的代码似乎关闭了一小时.当我中午通过转换器时，我回到 18:00:00.但是当我通过在线转换器运行相同的数据时，我得到了 17:00:00.

I'm attempting to craft a function that takes a time object and converts it to UTC time. The code below appears to be off by one hour. When i run noon through the converter, i get back 18:00:00. But when i run the same data through online converters, i get 17:00:00.

我在这里做错了什么?任何帮助将不胜感激.

What am i doing wrong here? Any help would be greatly appreciated.

import pytz, datetime

def convert_to_utc(time, tz):
    now_dt = datetime.datetime.utcnow()
    #get a date object
    date_dt = now_dt.date()
    #combine the current date object with our given time object
    dt = datetime.datetime.combine(date_dt, time)
    #get an timezone object for the source timezone
    src_tz = pytz.timezone(str(tz))
    #stamp the source datetime object with the src timezone 
    src_dt = dt.replace(tzinfo=src_tz)
    #get the offset from utc to given timezone
    offset = str(int(src_dt.strftime("%z"))).rstrip('0')
    #convert the source datetime object to
    utc_dt = src_dt.astimezone(pytz.utc)
    #return the converted time and the offset in integer format
    return (utc_dt.time(), int(offset))

time = datetime.datetime.strptime('12:00:00', "%H:%M:%S").time()
(TIME, offset) = convert_to_utc(time, 'America/Chicago')
print TIME.strftime("%H:%M:%S")

**EDIT**

**EDIT**

这是更新的(和功能性的)代码，以防其他人需要帮助转换为 UTC 或从 UTC 转换.

Here's the updated(and functional) code in case anyone else needs help converting to/from UTC.

感谢大家的帮助！

import pytz, datetime

def convert_to_utc(time, tz): #this returns the offset in int form as well
    now_dt = datetime.datetime.utcnow()
    #get a date object
    date_dt = now_dt.date()
    #combine the current date object with our given time object
    dt = datetime.datetime.combine(date_dt, time)
    #get an timezone object for the source timezone
    src_tz = pytz.timezone(str(tz))
    #stamp the source datetime object with the src timezone 
    src_dt = src_tz.localize(dt)
    #get the offset from utc to given timezone
    offset = str(int(src_dt.strftime("%z"))).rstrip('0')
    #convert the source datetime object to
    utc_dt = src_dt.astimezone(pytz.utc)
    #return the converted time and the offset in integer format
    return (utc_dt.time(), int(offset))

def convert_from_utc(time, tz):
    now_dt = datetime.datetime.now()
    date = now_dt.date()
    dt = datetime.datetime.combine(date, time)
    dest = pytz.timezone(str(tz))
    dt = dt.replace(tzinfo=pytz.utc)
    dest_dt = dt.astimezone(dest)
    return dest_dt.time()

time = datetime.datetime.strptime('12:00:00', "%H:%M:%S").time()
(TIME, offset) = convert_to_utc(time, 'America/Chicago')
print TIME.strftime("%H:%M:%S")

utc_time = datetime.datetime.strptime('17:00:00', "%H:%M:%S").time()
TIME = convert_from_utc(utc_time, 'America/Chicago')
print TIME.strftime("%H:%M:%S")

推荐答案

更改

src_dt = dt.replace(tzinfo=src_tz)

到

src_dt = src_tz.localize(dt)

使用 localize 调整夏令时，而 replace 不会.请参阅文档中标题为本地化时间和日期算术"的部分.

Using localize adjusts for Daylight Savings Time, while replace does not. See the section entitled "Localized times and date arithmetic" in the docs.

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