将datetime。在Python中，date转换为UTC时间戳

我正在处理Python中的日期，我需要将它们转换为UTC时间戳以供使用在Javascript。下面的代码不能工作:

>>> d = datetime.date(2011,01,01)
>>> datetime.datetime.utcfromtimestamp(time.mktime(d.timetuple()))
datetime.datetime(2010, 12, 31, 23, 0)

首先将date对象转换为datetime也没有帮助。我在这个链接中尝试了这个例子，但是:

from pytz import utc, timezone
from datetime import datetime
from time import mktime
input_date = datetime(year=2011, month=1, day=15)

现在:

mktime(utc.localize(input_date).utctimetuple())

mktime(timezone('US/Eastern').localize(input_date).utctimetuple())

做的工作。

一般问题:如何根据UTC将日期转换为从epoch开始的秒数?

当前回答

一个完整的时间字符串包含:

日期时间 utcoffset [+HHMM或-HHMM]

例如:

0000 == UNIX时间戳:3600

$ python3
>>> from datetime import datetime
>>> from calendar import timegm
>>> tm = '1970-01-01 06:00:00 +0500'
>>> fmt = '%Y-%m-%d %H:%M:%S %z'
>>> timegm(datetime.strptime(tm, fmt).utctimetuple())
3600

注意:

UNIX时间戳是一个浮点数，以UTC标准从epoch开始的秒数表示。

编辑:

$ python3
>>> from datetime import datetime, timezone, timedelta
>>> from calendar import timegm
>>> dt = datetime(1970, 1, 1, 6, 0)
>>> tz = timezone(timedelta(hours=5))
>>> timegm(dt.replace(tzinfo=tz).utctimetuple())
3600

2012-01-08 14:06:06

其他回答

Assumption 1: You're attempting to convert a date to a timestamp, however since a date covers a 24 hour period, there isn't a single timestamp that represents that date. I'll assume that you want to represent the timestamp of that date at midnight (00:00:00.000). Assumption 2: The date you present is not associated with a particular time zone, however you want to determine the offset from a particular time zone (UTC). Without knowing the time zone the date is in, it isn't possible to calculate a timestamp for a specific time zone. I'll assume that you want to treat the date as if it is in the local system time zone.

首先，您可以使用timetuple()成员将日期实例转换为表示各种时间组件的元组:

dtt = d.timetuple() # time.struct_time(tm_year=2011, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=5, tm_yday=1, tm_isdst=-1)

然后你可以使用time.mktime将其转换为时间戳:

ts = time.mktime(dtt) # 1293868800.0

您可以通过使用epoch时间本身(1970-01-01)测试来验证此方法，在这种情况下，函数应该返回该日期本地时区的时区偏移量:

d = datetime.date(1970,1,1)
dtt = d.timetuple() # time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=1, tm_isdst=-1)
ts = time.mktime(dtt) # 28800.0

28800.0是8小时，这对太平洋时区(我所在的时区)来说是正确的。

2012-01-08 16:53:52

遵循python2.7文档，必须使用calendar.timegm()而不是time.mktime()

>>> d = datetime.date(2011,01,01)
>>> datetime.datetime.utcfromtimestamp(calendar.timegm(d.timetuple()))
datetime.datetime(2011, 1, 1, 0, 0)

2014-06-30 06:51:30

这次深入的讨论给我留下了深刻的印象。

我的观点是:

from datetime import datetime
import time

utc格式的时间戳为:

timestamp = \
    (datetime.utcnow() - datetime(1970,1,1)).total_seconds()

or,

timestamp = time.time()

if now的结果是datetime.now()，在相同的DST

utcoffset = (datetime.now() - datetime.utcnow()).total_seconds()
timestamp = \
    (now - datetime(1970,1,1)).total_seconds() - utcoffset

2019-10-06 13:23:30

这对我来说是可行的，传递一个函数。

from datetime import timezone, datetime, timedelta 
import datetime


def utc_converter(dt):
    dt = datetime.datetime.now(timezone.utc)
    utc_time = dt.replace(tzinfo=timezone.utc)
    utc_timestamp = utc_time.timestamp()
    return utc_timestamp



# create start and end timestamps
_now = datetime.datetime.now()
str_start = str(utc_converter(_now))
_end = _now + timedelta(seconds=10)
str_end = str(utc_converter(_end))

2021-05-07 13:31:22