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我想找到最后一个午夜时间戳(只有输入是当前时间戳)。什么是最好的方法?

我正在为全球移动应用程序编写 python 脚本。具有当前时间戳的用户请求,并且在服务器端我想在不影响时区参数的情况下找到用户的最后一个午夜时间戳。

我搜索了一下,有解决办法

import time
etime = int(time.time())
midnight = (etime - (etime % 86400)) + time.altzon

它对我有用。但我对time.altzon功能感到困惑,它是否会给不同时区的用户带来任何问题。

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1 回答 1

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要获取客户端(移动设备)的午夜时间戳,您需要知道客户端的时区。

from datetime import datetime
import pytz # pip install pytz

fmt = '%Y-%m-%d %H:%M:%S %Z%z'
tz = pytz.timezone("America/New_York") # supply client's timezone here

# Get correct date for the midnight using given timezone.

# due to we are interested only in midnight we can:

# 1. ignore ambiguity when local time repeats itself during DST change e.g.,
# 2012-04-01 02:30:00 EST+1100 and
# 2012-04-01 02:30:00 EST+1000
# otherwise we should have started with UTC time

# 2. rely on .now(tz) to choose timezone correctly (dst/no dst)
now = datetime.now(tz)
print(now.strftime(fmt))

# Get midnight in the correct timezone (taking into account DST)
midnight = tz.localize(now.replace(hour=0, minute=0, second=0, microsecond=0, tzinfo=None),
                       is_dst=None)
print(midnight.strftime(fmt))

# Convert to UTC (no need to call `tz.normalize()` due to UTC has no DST transitions)
dt = midnight.astimezone(pytz.utc)
print(dt.strftime(fmt))

# Get POSIX timestamp
print((dt - datetime(1970,1,1, tzinfo=pytz.utc)).total_seconds())

输出

2012-08-09 08:46:29 EDT-0400
2012-08-09 00:00:00 EDT-0400
2012-08-09 04:00:00 UTC+0000
1344484800.0

注意:在我的机器上@phihag 的答案与上面1344470400.0的不同(我的机器不在纽约)。

于 2012-08-09T12:51:06.757 回答