Python中和时间操作有关的代码

深碍√TFBOYSˉ_ 2022-05-20 07:43 193阅读 0赞

本文转载自：https://blog.csdn.net/a8039974/article/details/79025504

1.获取当前时间的两种方法：

复制代码 代码如下:

import datetime,time  
now = time.strftime("%Y-%m-%d %H:%M:%S")  
print now  
now = datetime.datetime.now()  
print now

2.获取上个月最后一天的日期(本月的第一天减去1天)

复制代码 代码如下:

last = datetime.date(datetime.date.today().year,datetime.date.today().month,1)-datetime.timedelta(1)  
print last

3.获取时间差(时间差单位为秒，常用于计算程序运行的时间)

复制代码 代码如下:

starttime = datetime.datetime.now()  
\#long running  
endtime = datetime.datetime.now()  
print (endtime - starttime).seconds

4.计算当前时间向后10个小时的时间

复制代码 代码如下:

d1 = datetime.datetime.now()  
d3 = d1 + datetime.timedelta(hours=10)  
d3.ctime()

其本上常用的类有：datetime和timedelta两个。它们之间可以相互加减。每个类都有一些方法和属性可以查看具体的值，如 datetime可以查看：天数(day)，小时数(hour)，星期几(weekday())等;timedelta可以查看：天数(days)，秒数 (seconds)等。  
  
5.python中时间日期格式化符号：  
  
%y 两位数的年份表示（00-99）  
%Y 四位数的年份表示（000-9999）  
%m 月份（01-12）  
%d 月内中的一天（0-31）  
%H 24小时制小时数（0-23）  
%I 12小时制小时数（01-12）  
%M 分钟数（00=59）  
%S 秒（00-59）  
  
%a 本地简化星期名称  
%A 本地完整星期名称  
%b 本地简化的月份名称  
%B 本地完整的月份名称  
%c 本地相应的日期表示和时间表示  
%j 年内的一天（001-366）  
%p 本地A.M.或P.M.的等价符  
%U 一年中的星期数（00-53）星期天为星期的开始  
%w 星期（0-6），星期天为星期的开始  
%W 一年中的星期数（00-53）星期一为星期的开始  
%x 本地相应的日期表示  
%X 本地相应的时间表示  
%Z 当前时区的名称  
%% %号本身

<table style="border-collapse:collapse;border-spacing:0px 0px;text-align:left;"> 
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    <div style="margin-left:0px;"> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">import</span></code> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">datetime</span></code> 
     </div> 
     <div style="margin-left:0px;"> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>starttime </code><code>=</code><code>datetime.datetime.now()</code></span></span> 
     </div> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">#long running</span></code> 
     </div> 
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      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>endtime </code><code>=</code><code>datetime.datetime.now()</code></span></span> 
     </div> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">print</span></code> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>(endtime </code><code>-</code></span></span> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">starttime).seconds</span></code> 
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    </div></td> 
  </tr> 
 </tbody> 
</table>

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   <td style="border-bottom-color:rgb(221,221,221);border-bottom-style:solid;border-bottom-width:.5px;border-left-color:rgb(221,221,221);border-left-style:solid;border-left-width:.5px;border-right-color:rgb(221,221,221);border-right-style:solid;border-right-width:.5px;border-top-color:rgb(221,221,221);border-top-style:solid;border-top-width:.5px;color:rgb(79,79,79);font-size:14px;font-weight:400;line-height:22px;margin-left:0px;text-align:left;"> 
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      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>start </code><code>=</code><code>time.time()</code></span></span> 
     </div> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">run_fun()</span></code> 
     </div> 
     <div style="margin-left:0px;"> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>end </code><code>=</code><code>time.time()</code></span></span> 
     </div> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">print</span></code> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>end</code><code>-</code><code>start</code></span></span> 
     </div> 
    </div></td> 
  </tr> 
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     <div style="margin-left:0px;"> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>start </code><code>=</code><code>time.clock()</code></span></span> 
     </div> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">run_fun()</span></code> 
     </div> 
     <div style="margin-left:0px;"> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>end </code><code>=</code><code>time.clock()</code></span></span> 
     </div> 
     <div style="margin-left:0px;"> 
      <code><span style="font-family:NSimsun;font-size:14px;color:#4f4f4f;">print</span></code> 
      <span style="color:#4f4f4f;"><span style="font-family:NSimsun;"><code>end</code><code>-</code><code>start</code></span></span> 
     </div> 
    </div></td> 
  </tr> 
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