datetime将字符串日期转换为Java日期对象

Question

Possible Duplicates:
Calculating difference in dates in Java
How can I calculate a time span in Java and format the output?

假设给你两个日期作为字符串，它们是这种格式的8/11/11 9:16:36 PM我如何将它们转换为java日期对象，以便计算两个日期之间的差异

Answer 1

只要这两个时间都是GMT/UTC，就可以执行date1.getTime() - date2.getTime()，然后将结果除以86400000，得到天数。其余的可能是相当直观的

根据已编辑的问题进行编辑

要将字符串转换为日期，请使用SimpleDateFormat类

String yourDateString = "8/11/11 9:16:36 PM";
SimpleDateFormat format =
            new SimpleDateFormat("MM/dd/yy HH:mm:ss a");
Date yourDate = format.parse(yourDateString);

Answer 2

大多数Date的getter都已被弃用，取而代之的是Calendar方法。以下是你将如何做到这一点

Date date1, date2; //initialized elsewhere
Calendar day1 = new Calendar();
day1.setTime(date1)

Calendar day2 = new Calendar();
day2.setTime(date2);


int yearDiff, monthDiff, dayDiff, hourDiff, minuteDiff, secondDiff;
yearDiff = Math.abs(day1.get(Calendar.YEAR)-day2.get(Calendar.YEAR));
monthDiff = Math.abs(day1.get(Calendar.MONTH)-day2.get(Calendar.MONTH));
dayDiff = Math.abs(day1.get(Calendar.DAY_OF_YEAR)-day2.get(Calendar.DAY_OF_YEAR));
hourDiff = Math.abs(day1.get(Calendar.HOUR_OF_DAY)-day2.get(Calendar.HOUR_OF_DAY));
minuteDiff = Math.abs(day1.get(Calendar.MINUTE)-day2.get(Calendar.MINUTE));
secondDiff = Math.abs(day1.get(Calendar.SECOND)-day2.get(Calendar.SECOND));

然后你可以用这些数字做任何你喜欢的事情