java - 如何使用 Apache DateUtils 获取上个月从第一天到最后一天的时间 [JAVA]？

Question

如果输入是今天（6 月 7 日），那么它应该给我 5 月 1 日上午 12:00 到 5 月 31 日晚上 11:59。我正在使用日历，但我想使用 DateUtils。

Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.DAY_OF_MONTH, -1);
calendar.set(Calendar.HOUR,23);
calendar.set(Calendar.MINUTE,59);
calendar.set(Calendar.SECOND,59);
System.out.println("Last date of month: " + calendar.getTime());


calendar.set(Calendar.DAY_OF_MONTH, 1);
calendar.set(Calendar.HOUR, 12);
calendar.set(Calendar.MINUTE,00);
calendar.set(Calendar.SECOND,00);
System.out.println("fir stdate of month: " + calendar.getTime());

Answer 1

DateUtils 可以执行所需的操作：

Date lastmonth = DateUtils.addMonths(new Date(), -1);
System.out.println(lastmonth);
System.out.println(DateUtils.truncate(lastmonth, Calendar.MONTH));
System.out.println(DateUtils.addMinutes(DateUtils.ceiling(lastmonth, Calendar.MONTH), -1));

编辑：添加输出

Sat May 07 23:06:05 AST 2016
Sun May 01 00:00:00 AST 2016
Tue May 31 23:59:00 AST 2016

Answer 2

我最终使用了 JodaTime。容易多了！

MutableDateTime dateTime = new MutableDateTime();
System.out.println("CurrentTime " + dateTime);
dateTime.addMonths(-1); //last Month
dateTime.setMinuteOfDay(0);
dateTime.setSecondOfMinute(0);
dateTime.setHourOfDay(12);
dateTime.setDayOfMonth(1); //first Day of last Month     
System.out.println("first Day Time " + dateTime);

dateTime.setDayOfMonth(dateTime.dayOfMonth().getMaximumValue()); //set Day to last Day of that month
dateTime.setMinuteOfDay(59);
dateTime.setSecondOfMinute(59);
dateTime.setHourOfDay(23); //time set to night time 11:59:59

System.out.println("last Day Time " + dateTime);