java日期常用操作

 @Test
    public void validateDateUtils(){
        // 1 字符串转换日期
        Date result = DateUtil.parse("2023-08-01", com.alibaba.excel.util.DateUtils.DATE_FORMAT_10);
        log.info("result : [{}]" , result);

        // 2 日期转换字符串
        final Date date = new Date();
        String formatStr = DateFormatUtils.format(date, com.alibaba.excel.util.DateUtils.DATE_FORMAT_19);
        log.info("formatStr : [{}]" , formatStr);

        // 3 获取当前时间，格式为yyyy-MM-dd，yyyy-MM-dd HH:mm:ss，yyyyMMddHHmmss
        final String formatYMR = DateFormatUtils.format(date, com.alibaba.excel.util.DateUtils.DATE_FORMAT_10);
        log.info("formatYMR : [{}]" , formatYMR);
        final String formatYMRSFM = DateFormatUtils.format(date, com.alibaba.excel.util.DateUtils.DATE_FORMAT_19);
        log.info("formatYMRSFM : [{}]" , formatYMRSFM);
        final String formatYMRSFMS = DateFormatUtils.format(date, com.alibaba.excel.util.DateUtils.DATE_FORMAT_14);
        log.info("formatYMRSFMS : [{}]" , formatYMRSFMS);

        // 4 日期相减
        final long resultTime = result.getTime();
        final long dateTIme = date.getTime();
        final long diffInDays = (dateTIme - resultTime) / (1000 * 60 * 60 * 24);
        log.info("diffInDays : [{}]" , diffInDays);

        // 5 日期加减操作
        final int compareDays = cn.hutool.core.date.DateUtil.compare(date, result);
        log.info("compareDays : [{}]" , compareDays);
        final Date addDate = DateUtils.addDays(new Date(), 1);
        log.info("addDate : [{}]" , addDate);

        // 6 日期转换时间戳
        final long current = cn.hutool.core.date.DateUtil.current();
        final long currentTimeMillis = System.currentTimeMillis();
        log.info("currentTimeMillis : [{}]" , currentTimeMillis);
        log.info("current : [{}]" , current);
        // 7 util.date转换sql.date
        Timestamp timestamp = new Timestamp(currentTimeMillis);
        log.info("timestamp : [{}]" , timestamp);

    }

22:49:41.918 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - result : [Tue Aug 01 00:00:00 CST 2023]
22:49:42.102 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - formatStr : [2023-08-09 22:49:41]
22:49:42.103 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - formatYMR : [2023-08-09]
22:49:42.103 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - formatYMRSFM : [2023-08-09 22:49:41]
22:49:42.106 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - formatYMRSFMS : [20230809224941]
22:49:42.106 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - diffInDays : [8]
22:49:42.121 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - compareDays : [1]
22:49:42.121 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - addDate : [Thu Aug 10 22:49:42 CST 2023]
22:49:42.122 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - currentTimeMillis : [1691592582122]
22:49:42.122 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - current : [1691592582122]
22:49:42.123 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - timestamp : [2023-08-09 22:49:42.122]