怎么用 gmmktime 函数计算两个时间点之间的差值？一步步教你

gitbox 2025-09-18

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 文章开始之前的无关内容</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"这是一段和正文没关系的提示文字。"</span></span><span>;

</span><span><span class="hljs-comment">// 分隔线</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<hr>"</span></span><span>;
</span><span><span class="hljs-meta">?></span></span><span>

<h1>怎么用 gmmktime 函数计算两个时间点之间的差值？一步步教你</h1>

<p>在 PHP 中，<code></span><span><span class="hljs-title function_ invoke__">gmmktime</span></span><span>()

与 mktime() 不同的是，gmmktime() 不受本地时区影响，而是以 UTC 时间为基准，这样在涉及跨时区的应用时更为精准。

2. 获取两个时间点的时间戳

假设我们要计算 2023 年 1 月 1 日 00:00:00 和 2023 年 2 月 1 日 00:00:00 之间的差值，可以这样写：

&lt;?php
</span><span><span class="hljs-variable">$time1</span></span><span> = </span><span><span class="hljs-title function_ invoke__">gmmktime</span></span><span>(</span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">2023</span></span><span>);
</span><span><span class="hljs-variable">$time2</span></span><span> = </span><span><span class="hljs-title function_ invoke__">gmmktime</span></span><span>(</span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">2</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">2023</span></span><span>);

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"第一个时间戳: <span class="hljs-subst">$time1</span></span></span><span>&lt;br&gt;";
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"第二个时间戳: <span class="hljs-subst">$time2</span></span></span><span>&lt;br&gt;";
?&gt;

3. 计算差值（秒数）

两个 Unix 时间戳相减，就能得到它们之间的秒数差：

&lt;?php
</span><span><span class="hljs-variable">$diff</span></span><span> = </span><span><span class="hljs-variable">$time2</span></span><span> - </span><span><span class="hljs-variable">$time1</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"两个时间相差的秒数为: <span class="hljs-subst">$diff</span></span></span><span> 秒";
?&gt;

4. 转换为天数

如果我们更关心天数，可以把秒数换算为天数：

&lt;?php
</span><span><span class="hljs-variable">$days</span></span><span> = </span><span><span class="hljs-variable">$diff</span></span><span> / (</span><span><span class="hljs-number">60</span></span><span> * </span><span><span class="hljs-number">60</span></span><span> * </span><span><span class="hljs-number">24</span></span><span>);
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"两个时间相差 <span class="hljs-subst">$days</span></span></span><span> 天";
?&gt;

5. 综合示例

完整的代码如下：

&lt;?php
</span><span><span class="hljs-variable">$time1</span></span><span> = </span><span><span class="hljs-title function_ invoke__">gmmktime</span></span><span>(</span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">2023</span></span><span>);
</span><span><span class="hljs-variable">$time2</span></span><span> = </span><span><span class="hljs-title function_ invoke__">gmmktime</span></span><span>(</span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">0</span></span><span>, </span><span><span class="hljs-number">2</span></span><span>, </span><span><span class="hljs-number">1</span></span><span>, </span><span><span class="hljs-number">2023</span></span><span>);

</span><span><span class="hljs-variable">$diff</span></span><span> = </span><span><span class="hljs-variable">$time2</span></span><span> - </span><span><span class="hljs-variable">$time1</span></span><span>;
</span><span><span class="hljs-variable">$days</span></span><span> = </span><span><span class="hljs-variable">$diff</span></span><span> / (</span><span><span class="hljs-number">60</span></span><span> * </span><span><span class="hljs-number">60</span></span><span> * </span><span><span class="hljs-number">24</span></span><span>);

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"从 2023-01-01 到 2023-02-01 共相差: &lt;br&gt;"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<span class="hljs-subst">$diff</span></span></span><span> 秒&lt;br&gt;";
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<span class="hljs-subst">$days</span></span></span><span> 天";
?&gt;

6. 总结

通过 gmmktime()，我们能够轻松获取 GMT 时间戳，并通过相减来计算两个时间点之间的差值。换算后，我们就能得到秒、分钟、小时甚至天数，非常适合做时间差的计算。如果你在项目中遇到类似需求，不妨尝试用这种方法来实现。