如何从Date删除毫秒，秒，分和小时 [英] How to remove milliseconds, seconds, minutes and hours from Date

问题描述

我遇到一个问题，我想比较两个日期。不过，我只想比较年，月，日。这是我可以做的：

I ran into a problem where I wanted to compare two dates. However, I only wanted to compare Year, Month and Day. And this is what I can up with:

 private Date trim(Date date) {

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.MILLISECOND, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.HOUR, 0);
        return calendar.getTime();
    }

我用这个功能修剪所有的单位，但是几天，几个月和几年。

I user this function to trim all units but days, months and years.

现在，问题是你怎么看？
你知道其他任何方式吗？

Now, the question is what do you think about it? Do you know any other way to do so?

谢谢

推荐答案

你真的需要使用 java.util.Date ？如果您可以切换到 joda时间，您会发现非常好的功能，如：

Do you really need to use java.util.Date ? If you can switch to joda time, you'll find very nice features like:

dateTime.dayOfMonth().roundFloorCopy()

它完全符合您的需要。

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