獲取當前系統時間的前一天，后一天

獲取當前系統前一天日期

public static Date getYesterday(Date date) {

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);

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

        date = calendar.getTime();

        return date;

    }

獲取當前系統當天日期

public static Date getToday(Date date) {

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);

        calendar.add(Calendar.DAY_OF_MONTH, 0);

        date = calendar.getTime();

        return date;

    }

獲取當前系統下一天日期

public static Date getNextday(Date date) {

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);

        calendar.add(Calendar.DAY_OF_MONTH, 1);

        date = calendar.getTime();

        return date;

    }