我想找到最后一个午夜时间戳(只输入当前时间戳)。什么是最好的方式?
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,我想找到没有影响时区参数的用户的最后一个午夜时间戳。
我搜索了它,我得到了一个解决方案
import time
etime = int(time.time())
midnight = (etime - (etime % 86400)) + time.altzon
它为我工作。但是我对time.altzon
函数感到困惑,是否为不同时区的用户带来了任何问题。
答案 0 :(得分:5)
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())
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:在我的计算机@phihag's answer上生成的1344470400.0
与上面的不同(我的机器不在纽约)。