//獲取當前時間

Calendar calendar = Calendar.getInstance();

//獲取當前年

int year = calendar.get(Calendar.YEAR);??

//獲取當前月份

int month = calendar.get(Calendar.MONTH) + 1;

//獲取當前天

int day = calendar.get(Calendar.DAY_OF_MONTH);

//獲取當前小時

int hour = calendar.get(Calendar.HOUR_OF_DAY);

//獲取當前分鐘

int minute = calendar.get(Calendar.MINUTE);

//獲取是這周的第幾天 ? ?周三 對應數字4

int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);

//Calendar轉Date

Calendar calendar = Calendar.getInstance();

Date date = calendar.getTime();

// 獲取前一天date

private Date getBeforeDay(Date date) {

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

calendar.add(Calendar.DAY_OF_MONTH, -1);

date = calendar.getTime();

return date;

}

// 獲取后一天date

private Date getNextDay(Date date) {

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

calendar.add(Calendar.DAY_OF_MONTH, +1);

date = calendar.getTime();

return date;

}