Calendar

//获取当前时间

Calendar calendar = Calendar.getInstance();

//获取当前年

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

//获取当前月份

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

//获取当前天

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

//获取当前小时

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

//获取当前分钟

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

//获取是这周的第几天    周三 对应数字4

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

//Calendar转Date

Calendar calendar = Calendar.getInstance();

Date date = calendar.getTime();

// 获取前一天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;

}

// 获取后一天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;

}