System.currentTimeMillis()获取前一天

通过System.currentTimeMillis()方法获取的时间戳是当前时间的毫秒数，它表示从1970年1月1日00:00:00 GMT（格林尼治标准时间）到当前时间的毫秒数。要获取前一天的时间戳，我们可以先获取当前时间戳，然后减去一天的毫秒数。一天的毫秒数等于24小时乘以60分钟乘以60秒乘以1000毫秒，即24 * 60 * 60 * 1000。代码如下：

long currentTimeMillis = System.currentTimeMillis();
long oneDayInMillis = 24 * 60 * 60 * 1000; // 一天的毫秒数
long previousDayInMillis = currentTimeMillis - oneDayInMillis;

这样，previousDayInMillis就是获取到的前一天的时间戳。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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