java date时间操作

计算时间差

public static int secondsBetween(Date beforeDate,Date nowDate) throws Exception  {
        //时间格式
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        beforeDate=sdf.parse(sdf.format(beforeDate));
        nowDate=sdf.parse(sdf.format(nowDate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(beforeDate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(nowDate);
        long time2 = cal.getTimeInMillis();
        return Integer.parseInt(String.valueOf((time2-time1)/(1000)));
}

获取系统前一天

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;
}

获取当前系统时间

public static Date getNextDay(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时间

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;
} 

判断一个时间是否在一个时间段内

    /**
     * Description: 判断一个时间是否在一个时间段内 </br>
     *
     * @param nowTime 当前时间 </br>
     * @param beginTime 开始时间 </br>
     * @param endTime 结束时间 </br>
     */
    private boolean belongCalendar(Date nowTime, Date beginTime, Date endTime) {
        Calendar date = Calendar.getInstance();
        date.setTime(nowTime);
 
        Calendar begin = Calendar.getInstance();
        begin.setTime(beginTime);
 
        Calendar end = Calendar.getInstance();
        end.setTime(endTime);
 
        return date.after(begin) && date.before(end);
    }
}