Java 计算两个日期之间的天数

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import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class test3 {    /**     * @param args     * @throws ParseException     * format() 对日期进行格式化处理     * parse() 将日期设置为date类型     */    public static void main(String[] args) throws ParseException {          // TODO Auto-generated method stub          SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");          Date d1=sdf.parse("2016-09-08 10:10:10");          Date d2=sdf.parse("2016-09-26 22:00:00");        Date d3=sdf.parse(sdf.format(new Date()));//获得当前时间        System.out.println(daysBetween(d1,d2));          System.out.println(daysBetween(d2, d3));        System.out.println(daysBetween("2016-09-08 10:10:10","2016-09-29 00:00:00"));         System.out.println(daysBetween("2016-09-08 10:10:10", d3));    }            /**     * 计算两个日期之间相差的天数       * @param smdate 较小的时间      * @param bdate  较大的时间      * @return 相差天数      * @throws ParseException       * calendar 对日期进行时间操作     * getTimeInMillis() 获取日期的毫秒显示形式     */    public static int daysBetween(Date smdate,Date bdate) throws ParseException        {            Calendar cal = Calendar.getInstance();        cal.setTime(smdate);        long time1 = cal.getTimeInMillis();        cal.setTime(bdate);        long time2 = cal.getTimeInMillis();              long between_days=(time2-time1)/(1000*3600*24);          return Integer.parseInt(String.valueOf(between_days));               }    /**     * 字符串日期格式的计算     * @param smdate     * @param bdate     * @return     * @throws ParseException     */    public static int daysBetween(String smdate,String bdate) throws ParseException{          SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");          Calendar cal = Calendar.getInstance();            cal.setTime(sdf.parse(smdate));            long time1 = cal.getTimeInMillis();                         cal.setTime(sdf.parse(bdate));            long time2 = cal.getTimeInMillis();                 long between_days=(time2-time1)/(1000*3600*24);          return Integer.parseInt(String.valueOf(between_days));         }      /**     * 字符串日期格式和date日期格式的计算     * @param smdate     * @param bdate     * @return     * @throws ParseException     */    public static int daysBetween(String smdate,Date bdate) throws ParseException {    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");    Calendar cal = Calendar.getInstance();    cal.setTime(sdf.parse(smdate));    long time1 = cal.getTimeInMillis();    cal.setTime(bdate);    long time2 = cal.getTimeInMillis();    long between_days=(time2-time1)/(1000*3600*24);    return Integer.parseInt(String.valueOf(between_days));    }  }
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