Java 日期截止时间信息
我有一个包含日期和时间信息的 Java Date 对象.我想写一个方法，截断时间信息，截断时分秒，所以我只剩下日期了.
I have a Java Date object containing date and time information. I want to write a method that cuts off the time information, truncates the hours-minutes-seconds, so I only have the date left.
示例输入:
2008-01-01 13:15:00
预期输出:
2008-01-01 00:00:00
你有小费吗?我试着做这样的事情:
Do you have a tip? I tried doing something like this:
(timestamp / (24 * 60 * 60 * 1000)) * (24 * 60 * 60 * 1000)
但我遇到了时区问题.
推荐答案
推荐 进行日期/时间操作的方法是使用 Calendar 对象:
The recommended way to do date/time manipulation is to use a Calendar object:
Calendar cal = Calendar.getInstance(); // locale-specific
cal.setTime(dateObject);
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
long time = cal.getTimeInMillis();
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