Calendar calendar=Calendar.getInstance(); System.out.println("年:"+calendar.get(Calendar.YEAR)); System.out.println("月:"+(calendar.get(Calendar.MONTH)+1)); System.out.println("日:"+calendar.get(Calendar.DATE)); calendar.set(Calendar.MILLISECOND,0); calendar.set(Calendar.SECOND,0); calendar.set(Calendar.MINUTE,0); calendar.set(Calendar.HOUR_OF_DAY,0); System.out.println(DateFormatUtils.format(calendar.getTime(),"yyyy-MM-dd HH:mm:ss")); calendar.set(Calendar.HOUR_OF_DAY,24); System.out.println(DateFormatUtils.format(calendar.getTime(),"yyyy-MM-dd HH:mm:ss"));