JAVA日期操作

Calendar calendar = new GregorianCalendar();
System.out.println("YEAR: " calendar.get(Calendar.YEAR)); //得到当前年
System.out.println("MONTH: " calendar.get(Calendar.MONTH)); //得到当前月
System.out.println("WEEK_OF_YEAR: " calendar.get(Calendar.WEEK_OF_YEAR)); //得到当前年中的第几周
System.out.println("WEEK_OF_MONTH: " calendar.get(Calendar.WEEK_OF_MONTH)); //得到当前月中的第几周
System.out.println("DATE: " calendar.get(Calendar.DATE)); //得到当前日期
System.out.println("DAY_OF_MONTH: " calendar.get(Calendar.DAY_OF_MONTH)); //得到当前日期
System.out.println("DAY_OF_YEAR: " calendar.get(Calendar.DAY_OF_YEAR));
System.out.println("DAY_OF_WEEK: " calendar.get(Calendar.DAY_OF_WEEK));
System.out.println("DAY_OF_WEEK_IN_MONTH: "
calendar.get(Calendar.DAY_OF_WEEK_IN_MONTH));
System.out.println("AM_PM: " calendar.get(Calendar.AM_PM));
System.out.println("HOUR: " calendar.get(Calendar.HOUR));
System.out.println("HOUR_OF_DAY: " calendar.get(Calendar.HOUR_OF_DAY));
System.out.println("MINUTE: " calendar.get(Calendar.MINUTE));
System.out.println("SECOND: " calendar.get(Calendar.SECOND));
System.out.println("MILLISECOND: " calendar.get(Calendar.MILLISECOND));