获取当前系统时间的前一天，后一天

获取当前系统前一天日期 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;     } 获取当前系统当天日期 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;     } 获取当前系统下一天日期 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;     }