Pythondatetime.utcnow()返回不正确的日期时间

datetime.utcnow() 使用OS提供的值.

datetime.utcnow()使用gettimeofday(2)或time.time()在Python 2上(gmtime(3)并将结果转换为细分时间).

time.time()使用gettimeofday(2),ftime(3),time(2).较新的CPython版本可能会使用clock_gettime(2),GetSystemTimeAsFileTime().

您可以按如下方式检查自我一致性:

#!/usr/bin/env python
import time
from datetime import datetime, timedelta

print(datetime.utcnow())
print(datetime(1970, 1, 1) + timedelta(secOnds=time.time()))
print(datetime(*time.gmtime()[:6]))

这是基于CPython源GetSystemTimeAsFileTime()在Windows 上调用的(未经测试的)代码:

#!/usr/bin/env python
import ctypes.wintypes
from datetime import datetime, timedelta

def utcnow_microseconds():
    system_time = ctypes.wintypes.FILETIME()
    ctypes.windll.kernel32.GetSystemTimeAsFileTime(ctypes.byref(system_time))
    large = (system_time.dwHighDateTime <<32) + system_time.dwLowDateTime
    return large // 10 - 11644473600000000

print(datetime(1970, 1, 1) + timedelta(microsecOnds=utcnow_microseconds()))

这是调用clock_gettime()Python 2的代码.

datetime.utcnow() 使用OS提供的值.

datetime.utcnow()使用gettimeofday(2)或time.time()在Python 2上(gmtime(3)并将结果转换为细分时间).

time.time()使用gettimeofday(2),ftime(3),time(2).较新的CPython版本可能会使用clock_gettime(2),GetSystemTimeAsFileTime().

您可以按如下方式检查自我一致性:

#!/usr/bin/env python
import time
from datetime import datetime, timedelta

print(datetime.utcnow())
print(datetime(1970, 1, 1) + timedelta(secOnds=time.time()))
print(datetime(*time.gmtime()[:6]))

这是基于CPython源GetSystemTimeAsFileTime()在Windows 上调用的(未经测试的)代码:

#!/usr/bin/env python
import ctypes.wintypes
from datetime import datetime, timedelta

def utcnow_microseconds():
    system_time = ctypes.wintypes.FILETIME()
    ctypes.windll.kernel32.GetSystemTimeAsFileTime(ctypes.byref(system_time))
    large = (system_time.dwHighDateTime <<32) + system_time.dwLowDateTime
    return large // 10 - 11644473600000000

print(datetime(1970, 1, 1) + timedelta(microsecOnds=utcnow_microseconds()))

这是调用clock_gettime()Python 2的代码.