Java中时间方法大全01（持续更新）_system.currenttimemillis() / 1000

下面这些方法都可以封装到一个工具类中

　　/**
     * 获取当前时间的时间戳
     */
    public static int getCurrentTimeIntValue() {
        return (int) (System.currentTimeMillis() / 1000);
    }
 
 
    /**
     * 获取days天后的当前时间 时间戳
     */
    public static int addDaysTimeStamp(int days) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(new Date());
        cal.add(Calendar.DATE, days);
        return (int) (cal.getTimeInMillis() / 1000);
    }
 
    /**
     * 获取今日零点的时间戳
     */
    public static int getStartTimeStamp() {
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis()/1000;
        return (int)time;
    }
 
    /**
     * 获取今日23：59：59的时间戳
     */
    public static int getEndTimeStamp() {
        Calendar todayEnd = Calendar.getInstance();
        todayEnd.set(Calendar.HOUR_OF_DAY, 23);
        todayEnd.set(Calendar.MINUTE, 59);
        todayEnd.set(Calendar.SECOND, 59);
        todayEnd.set(Calendar.MILLISECOND, 999);
        long time = todayEnd.getTimeInMillis() / 1000;
        return (int) time;
    }
 
    /**
     * 获取指定时间零点的时间戳
     */
    public static int getStartTimeStamp(Date date) {
        Calendar todayStart = Calendar.getInstance();
        todayStart.setTime(date);
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis()/1000;
        return (int)time;
    }
 
    /**
     * 获取指定时间23：59：59的时间戳
     */
    public static int getEndTimeStamp(Date date) {
        Calendar todayEnd = Calendar.getInstance();
        todayEnd.setTime(date);
        todayEnd.set(Calendar.HOUR_OF_DAY, 23);
        todayEnd.set(Calendar.MINUTE, 59);
        todayEnd.set(Calendar.SECOND, 59);
        todayEnd.set(Calendar.MILLISECOND, 999);
        long time = todayEnd.getTimeInMillis() / 1000;
        return (int) time;
    }
 
    /**
     * 获取昨天零点的时间(字符串)
     */
    public static String getYesterDayStartTimeStamp() {
        SimpleDateFormat sdfYMD = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.SECOND,0); //这是将【秒】设置为0
        calendar.set(Calendar.MINUTE,0); //这是将【分】设置为0
        calendar.set(Calendar.HOUR_OF_DAY,0); //这是将【时】设置为0
        calendar.add(Calendar.DATE,-1); //当前日期加一
        String yesterday  = sdfYMD.format(calendar.getTime()); //获取昨天的时间 如2021-02-25 00:00:00
        return yesterday;
    }
 
    /**
     * 获取昨天零点的时间戳
     */
    public static Integer getBeforeStartTime(){
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis()/1000;
        return (int)time-86400;
    }
 
    /**
     * 获取昨天23:59:59的时间(字符串)
     */
    public static String getYesterDayEndTimeStamp() {
        SimpleDateFormat sdfYMD = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.SECOND,59); //这是将当天的【秒】设置为0
        calendar.set(Calendar.MINUTE,59); //这是将当天的【分】设置为0
        calendar.set(Calendar.HOUR_OF_DAY,23); //这是将当天的【时】设置为0
        calendar.add(Calendar.DATE,-1); //当前日期加一
        String yesterday  = sdfYMD.format(calendar.getTime()); //获取第二天的时间 2021-02-25 00:00:00
        return yesterday;
    }
 
 
 
    /**
     * 获取明天零点的时间戳
     */
    public static Integer getAfterStartime()
    {
        Calendar todayStart = Calendar.getInstance();
        todayStart.set(Calendar.HOUR_OF_DAY, 0);
        todayStart.set(Calendar.MINUTE, 0);
        todayStart.set(Calendar.SECOND, 0);
        todayStart.set(Calendar.MILLISECOND, 0);
        long time = todayStart.getTimeInMillis()/1000;
        return (int)time+86400;
    }
 
    /**
     * 将昨天凌晨时间转换为Date类型(下面设置成这样 new simpleDateFormat("yyyy-MM-dd HH:mm:ss") 数据中对应的字段类型就是DateTime)
　　　* 这个方法中调用了上面的getYesterDayStartTimeStamp()方法哦
     */
    public static Date getDateTime()
    {
        Date dateTime = null;
        String yesterDayStartTimeStamp =  DateUtil.getYesterDayStartTimeStamp();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try
        {
            dateTime = formatter.parse(yesterDayStartTimeStamp);
        }
        catch (ParseException e)
        {
            e.printStackTrace();
        }
        //Sun May 09 00:00:00 CST 2021
        return dateTime;
    }

   /**
     * @param begin 开始时间
     * @param end 结束时间
     * 获取begin - end 时间段内的每一天的日期 比如获取 2021-4-15到2021-5-10内每一天的日期
     */
    public static List<String> getDayBetweenDates(String begin, String end) throws ParseException
    {
        SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
        Date dBegin = sd.parse(begin); //将字符串参数转为Date类型 比如参数为 "2021-4-14" 将其转为Date类型
        Date dEnd = sd.parse(end);
        List<String> lDate = new ArrayList<>(); //创建集合, 存储begin - end 时间段内的时间
        lDate.add(sd.format(dBegin));
        Calendar calBegin = Calendar.getInstance();
        calBegin.setTime(dBegin);
        Calendar calEnd = Calendar.getInstance();
        calEnd.setTime(dEnd);
        while (dEnd.after(calBegin.getTime()))
        {
            calBegin.add(Calendar.DAY_OF_MONTH, 1);
            lDate.add(sd.format(calBegin.getTime()));
        }
        return lDate;
    }