java计算两个日期间的天数

精确到年月日

    public static int daysBetween(Date start, Date end) {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        try {            start = sdf.parse(sdf.format(start));            end = sdf.parse(sdf.format(end));        } catch (ParseException e) {            e.printStackTrace();        }        long startTime = start.getTime();        long endTime = end.getTime();        long betweenDays = (endTime - startTime) / (1000 * 3600 * 24);        return Integer.parseInt(String.valueOf(betweenDays));    }

精确到秒，向下取值

    public static int daysBetween(Date start, Date end) {        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        try {            start = sdf.parse(sdf.format(start));            end = sdf.parse(sdf.format(end));        } catch (ParseException e) {            e.printStackTrace();        }        Calendar cal = Calendar.getInstance();        cal.setTime(start);        long startTime = cal.getTimeInMillis();        cal.setTime(end);        long endTime = cal.getTimeInMillis();        long betweenDays = (endTime - startTime) / (1000 * 3600 * 24);        return Integer.parseInt(String.valueOf(betweenDays));    }

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来源地址：https://blog.csdn.net/qq_40240091/article/details/129055104