日期

宣告日期，並給予宣告當下的日期和時間

Calendar calendar = Calendar.getInstance();

改變日期、時間

calendar.set(Calendar.MONTH, Calendar.JULY);//設定月份

calendar.set(Calendar.DAY_OF_MONTH, 15);//設定日期

calendar.set(Calendar.YEAR, 1978);//設定年份

calendar.set(Calendar.HOUR, 2);設定小時

calendar.set(Calendar.MINUTE, 15);//設定分鐘

calendar.set(Calendar.SECOND, 37);//設定秒

取得日期、時間

System.out.println("The YEAR is: " + calendar.get(Calendar.YEAR));//取得年份

System.out.println("The MONTH is: " + calendar.get(Calendar.MONTH));//取得月份(一月為 0 )

System.out.println("The DAY is: " + calendar.get(Calendar.DATE));//取得日期

System.out.println("The HOUR is: " + calendar.get(Calendar.HOUR));//取得小時

System.out.println("The MINUTE is: " + calendar.get(Calendar.MINUTE));//取得分鐘

System.out.println("The SECOND is: " + calendar.get(Calendar.SECOND));//取得秒

System.out.println("The AM_PM indicator is: " + calendar.get(Calendar.AM_PM));//取得AM或PM