时间模块 time

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          <h3 id="python">《Python 教程》授课笔记附件</h3>
<ul>
<li>讲师: 魏明择</li>
<li>时间: 2019</li>
</ul>
<h3 id="time">时间模块 time</h3>
<ul>
<li>此模块提供了时间相关的函数，且一直可用</li>
</ul>
<h4 id="_1">时间简介</h4>
<ul>
<li>
<p>公元纪年是从公元 0000年1月1日0时开始的</p>
</li>
<li>
<p>计算机元年是从1970年1月1日0时开始的,此时时间为0,之后每过一秒时间+1</p>
</li>
<li>
<p>UTC 时间 (Coordinated Universal Time)世界标准时间 是从Greenwich时间开始计算的.<br>UTC 时间不会因时区问题而产生错误</p>
</li>
<li>
<p>DST 阳光节约时间(Daylight Saving Time)，又称夏令时, 是一个经过日照时间修正后的时间</p>
</li>
</ul>
<h4 id="_2">时间元组</h4>
<ul>
<li>时间元组是一个9个整型元素组成的,这九个元素自前至后依次为:<ul>
<li>四位的年(如: 1993)</li>
<li>月 (1-12)</li>
<li>日 (1-31)</li>
<li>时 (0-23)</li>
<li>分 (0-59)</li>
<li>秒 (0-59)</li>
<li>星期几 (0-6, 周一是 0)</li>
<li>元旦开始日 (1-366)</li>
<li>夏令时修正时间 (-1, 0 or 1). </li>
</ul>
</li>
<li>注：<ul>
<li>如果年份值小于100,则会自动转换为加上1900后的值</li>
</ul>
</li>
</ul>
<h4 id="time_1">模块名: time</h4>
<h4 id="_3">时间模块用法：</h4>
<div class="codehilite"><pre>import time
# 或
from time import xxx
# 或
from time import *
</pre></div>

<table>
<thead>
<tr>
<th>数据</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>time.altzone</td>
<td>夏令时时间与UTC时间差(秒为单位)</td>
</tr>
<tr>
<td>time.daylight</td>
<td>夏令时校正时间</td>
</tr>
<tr>
<td>time.timezone</td>
<td>本地区时间与UTC时间差(秒为单位)</td>
</tr>
<tr>
<td>time.tzname</td>
<td>时区名字的元组， 第一个名字为未经夏令时修正的时区名,<br>第一个名字为经夏令时修正后的时区名</td>
</tr>
</tbody>
</table>
<p>注： CST为中国标准时间(China Standard Time UTC+8:00)</p>
<table>
<thead>
<tr>
<th>函数名</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>time.time()</td>
<td>返回从计算机元年至当前时间的秒数的浮点数(UTC时间为准)</td>
</tr>
<tr>
<td>time.gmtime([secs])</td>
<td>用给定秒数转换为用UTC表达的时间元组<br>(缺省返回当前时间元组)</td>
</tr>
<tr>
<td>time.localtime([secs])</td>
<td>将UTC秒数时间转换为日期元组（以本地时间为准)</td>
</tr>
<tr>
<td>time.mktime(tuple)</td>
<td>将本地日期时间元组转换为新纪元秒数时间(UTC为准)</td>
</tr>
<tr>
<td>time.asctime([tuple])</td>
<td>将时间元组转换为日期时间字符串</td>
</tr>
<tr>
<td>time.sleep(secs)</td>
<td>让程序按给定秒数的浮点数睡眠一段时间</td>
</tr>
</tbody>
</table>

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