Question

I need to generate a timestamp in NTP format in Python. Specifically, I need to calculate the number of seconds since 1st January 1900, as a 32-bit number. (NTP timestamps are actually 64 bits, with the other 32 bits representing fractions of seconds - I m not worried about this part).

我怎么办?

Answer 1

import datetime
diff = datetime.datetime.utcnow() - datetime.datetime(1900, 1, 1, 0, 0, 0)
timestamp = diff.days*24*60*60+diff.seconds
timestamp
# returns
# 3531049334

(注timedelta. Total_seconds() is not available in python3)

Answer 2

http://pypi.python.org/pypi/ntplib/“rel=“nofollow”>ntplib:

SYSTEM_EPOCH = datetime.date(*time.gmtime(0)[0:3])
NTP_EPOCH = datetime.date(1900, 1, 1)
NTP_DELTA = (SYSTEM_EPOCH - NTP_EPOCH).days * 24 * 3600

def ntp_to_system_time(date):
    """convert a NTP time to system time"""
    return date - NTP_DELTA

def system_to_ntp_time(date):
    """convert a system time to a NTP time"""
    return date + NTP_DELTA

并且如:

ntp_time = system_to_ntp_time(time.time())

Answer 3

请参看ntplib。

http://pypi.python.org/pypi/ntplib/

Answer 4

from datetime import datetime

(datetime.utcnow() - datetime(1900, 1, 1)).total_seconds()

这张旗号是,你可以以明显的方式加以改动。确保对结果进行核对:<代码><=2**32-1,因为你的方案必须在2036年中断。

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