昨天午夜是什么时代？ [英] What was midnight yesterday as an epoch time?

问题描述

我试图让我的头脑围绕datetime模块。我知道现在的时间是一个时代，一个事件发生的时间（作为一个时代）。我需要做的是弄清楚这个事件是否在昨天午夜到午夜之间发生。

  t = time.time（） ＃现在是
 t2 = 1234567890＃从我的日志中的某些任意时间
  

24小时前是t - 86400，但是我怎么能把它上下颠倒到午夜。我遇到了一个方法来获取时间戳进出日期时间，然后操纵datetime来设置时间。

解决方案

p>生成最后一个午夜很容易：

  from datetime import datetime，date，time 
 
午夜= datetime.combine（date.today（），time.min）
  

结合了今天的日期，一起 time.min 在午夜时间形成 datetime 对象。

使用 timedelta（）您可以计算以前的 午夜：

  from datetime import timedelta 
 
 yesterday_midnight =午夜 -  timedelta（days = 1）
  

现在你需要做的是测试你的时间戳记是否在这两点之间：

  timestamp = datetime.fromtimestamp（some_timestamp_from_y my_log）
 if yesterday_midnight< = timestamp<午夜：
＃这发生在00:00:00和23:59:59之间
  

组合成一个函数：

  from datetime import datetime，date，time，timedelta 
 
 def is_yesterday （timestamp）：
 midnight = datetime.combine（date.today（），time.min）
 yesterday_midnight =午夜 -  timedelta（days = 1）
 timestamp = datetime.fromtimestamp（some_timestamp_from_your_log） 
 return yesterday_midnight< = timestamp<午夜：
  

I'm trying to get my head around the datetime module. I know the time now as an epoch and the time an event last happened (as an epoch time). What I need to do is figure out whether that event happened between midnight and midnight of yesterday.

t = time.time() # is now
t2 = 1234567890 # some arbitrary time from my log

24 hours ago is t - 86400, but how can I round that up and down to midnight. I'm having real trouble finding a way to get timestamps in and out of datetime or then manipulating a datetime to set the time.

解决方案

Generating the last midnight is easy:

from datetime import datetime, date, time

midnight = datetime.combine(date.today(), time.min)

That combines today's date, together with time.min to form a datetime object at midnight.

With a timedelta() you can calculate the previous midnight:

from datetime import timedelta

yesterday_midnight = midnight - timedelta(days=1)

Now all you need to do is test if your timestamp is in between these two points:

timestamp = datetime.fromtimestamp(some_timestamp_from_your_log)
if yesterday_midnight <= timestamp < midnight:
    # this happened between 00:00:00 and 23:59:59 yesterday

Combined into one function:

from datetime import datetime, date, time, timedelta

def is_yesterday(timestamp):
    midnight = datetime.combine(date.today(), time.min)
    yesterday_midnight = midnight - timedelta(days=1)
    timestamp = datetime.fromtimestamp(some_timestamp_from_your_log)
    return yesterday_midnight <= timestamp < midnight:

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