从本地转换为utc时区

Question

我正在尝试制作一个带有时间对象并将其转换为UTC时间的函数.下面的代码似乎关闭了一个小时.当我通过转换器中午运行时,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17:00:00.

我在这做错了什么？任何帮助将不胜感激.

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")

**编辑**

这是更新的(和功能)代码,以防其他人需要帮助转换为/从UTC转换.

谢谢大家的帮助!

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")

Answer 1

更改

src_dt = dt.replace(tzinfo=src_tz)

至

src_dt = src_tz.localize(dt)

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