java时间处理Calendar使用小记

DECEMBER  11

    /**    * 取得当天0点时间   2017-02-04 00:00:00    * @return  毫秒级时间戳    */    public static long getDayZero(long date) {        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        //取得当天的起始时间        calendar.set(Calendar.HOUR_OF_DAY,0);        calendar.set(Calendar.MINUTE, 0);        calendar.set(Calendar.SECOND, 0);        calendar.set(Calendar.MILLISECOND, 0);        //取得当天的结束时间        calendar.add(Calendar.DATE,1);        calendar.add(Calendar.MILLISECOND,-1);        return calendar.getTimeInMillis();    }    /**     * 入参时间所在月份的第一天     * @param date 入参时间 毫秒     * @return     */    public static long getFirstDayOfMonth(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        calendar.set(Calendar.DAY_OF_MONTH,1);        //可以设置当天的起始时间或者结束时间        //起始时间  0点0分0秒0毫秒        calendar.set(Calendar.HOUR_OF_DAY,0);        calendar.set(Calendar.MINUTE,0);        calendar.set(Calendar.SECOND,0);        calendar.set(Calendar.MILLISECOND,0);        //结束时间  23点59分59秒999毫秒        calendar.set(Calendar.HOUR_OF_DAY,23);        calendar.set(Calendar.MINUTE,59);        calendar.set(Calendar.SECOND,59);        calendar.set(Calendar.MILLISECOND,999);        return calendar.getTimeInMillis();    }    /**     * 入参时间所在月份的最后一天 有很多方式实现     * @param date 入参时间 毫秒     * @return     */    public static long getLastDayOfMonth(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        /*---------------------------------------------*/        //当前时间月份加一，设置天是月份的第一天，再减一天就是当月的最后一天        calendar.add(Calendar.MONTH,1);        calendar.set(Calendar.DAY_OF_MONTH,1);        calendar.add(Calendar.DATE,-1);        //可以设置当天的起始时间或者结束时间        //起始时间  0点0分0秒0毫秒        calendar.set(Calendar.HOUR_OF_DAY,0);        calendar.set(Calendar.MINUTE,0);        calendar.set(Calendar.SECOND,0);        calendar.set(Calendar.MILLISECOND,0);        /*--------------------如果不关心具体时间也可以根据毫秒减一获得-------------------------*/        calendar.add(Calendar.MONTH,1);        calendar.set(Calendar.DAY_OF_MONTH,1);        //设置为当天的起始时间 0点0分0秒0毫秒 ，再将时间减掉一毫秒        calendar.set(Calendar.HOUR_OF_DAY,0);        calendar.set(Calendar.MINUTE,0);        calendar.set(Calendar.SECOND,0);        calendar.set(Calendar.MILLISECOND,0);        calendar.add(Calendar.MILLISECOND,-1);        return calendar.getTimeInMillis();    }    /**     * 入参时间上个月份的最后一天     * @param date 入参时间 毫秒     * @return     */    public static long getPreviousMonthLastDay(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        calendar.set(Calendar.DAY_OF_MONTH,0);        return calendar.getTimeInMillis();    }    /**     * 入参时间的前一天     * 获得当前时间的前几天，几分钟，几秒 直接使用 calendar.add（）填写需要增加或者减少的属性 和值 即可     * @param date 入参时间 毫秒     * @return     */    public static long getPreviousDay(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        calendar.add(Calendar.DATE,-1);        //calendar.add(Calendar.MONDAY,-1);        //calendar.add(Calendar.YEAR,-1);        //calendar.add(Calendar.HOUR,-1);        //calendar.add(Calendar.MINUTE,-1);        //calendar.add(Calendar.SECOND,-1);        //calendar.add(Calendar.MILLISECOND,-1);        return calendar.getTimeInMillis();    }    /**     * 入参时间是当月的第几个week     * @param date     * @return     */    public static int getWeekOfMonth(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        return calendar.get(Calendar.WEEK_OF_MONTH);    }    /**     * 入参时间是当年的第几个week     * @param date     * @return     */    public static int getWeekOfYear(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        return calendar.get(Calendar.WEEK_OF_YEAR);    }    /**     * 入参时间是当年的第几天     * @param date     * @return     */    public static int getDayOfYear(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        return calendar.get(Calendar.DAY_OF_YEAR);    }    /**     * 入参时间是当月的第几天     * @param date     * @return     */    public static int getDayOfMonth(long date){        Calendar calendar = Calendar.getInstance();        //设置为入参时间        calendar.setTimeInMillis(date);        return calendar.get(Calendar.DAY_OF_MONTH);    }    /**     * 获取前N个月的起始时间，n为0表示当前月，1表示前一个月     * @param n     * @return 单位毫秒     */    public static long getLastNMonthStartTime(int n) {        Calendar calendar = Calendar.getInstance();        calendar.set(Calendar.DAY_OF_MONTH, 1);        calendar.set(Calendar.HOUR_OF_DAY, 0);        calendar.set(Calendar.MINUTE, 0);        calendar.set(Calendar.SECOND, 0);        calendar.set(Calendar.MILLISECOND, 0);        calendar.add(Calendar.MONTH, 0 - n);        return calendar.getTimeInMillis();    }    /**     * 获取前N个月的终止时间，n为0表示当前月，1表示前一个月     * @param n     * @return 单位毫秒     */    public static long getLastNMonthEndTime(int n) {        Calendar calendar = Calendar.getInstance();        calendar.set(Calendar.DAY_OF_MONTH, 1);        calendar.set(Calendar.HOUR_OF_DAY, 0);        calendar.set(Calendar.MINUTE, 0);        calendar.set(Calendar.SECOND, 0);        calendar.set(Calendar.MILLISECOND, 0);        calendar.add(Calendar.MONTH, 0 - n + 1);        calendar.add(Calendar.MILLISECOND ,-1);        return calendar.getTimeInMillis();    }    public static void main(String[] args){        System.out.println(DateTimeUtil.getDateTimeString(getDayZero(System.currentTimeMillis())));        System.out.println(getWeekOfMonth(System.currentTimeMillis()));        System.out.println(getWeekOfYear(System.currentTimeMillis()));        System.out.println(getDayOfMonth(System.currentTimeMillis()));        System.out.println(getDayOfYear(System.currentTimeMillis()));    }