Java 計算兩個日期相差月數、天數

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package com.myjava;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;public class MyCalendar {    /**     * @param args     * @throws ParseException     */    public static void main(String[] args) throws ParseException {        System.out.println(MyCalendar.getMonthSpace("1982-12-8", "2012-12-12"));    }/**     *      * @param date1 <String>     * @param date2 <String>     * @return int     * @throws ParseException     */    public static int getMonthSpace(String date1, String date2)            throws ParseException {        int result = 0;        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        Calendar c1 = Calendar.getInstance();        Calendar c2 = Calendar.getInstance();        c1.setTime(sdf.parse(date1));        c2.setTime(sdf.parse(date2));        result = c2.get(Calendar.MONTH) - c1.get(Calendar.MONTH);        return result == 0 ? 1 : Math.abs(result);    }}

 

     * @param date1 <String>     * @param date2 <String>     * @return int     * @throws ParseException     */    public int getDateSpace(String date1, String date2)            throws ParseException {        int result = 0;        Calendar calst = Calendar.getInstance();;        Calendar caled = Calendar.getInstance();        calst.setTime(parseDate("yyyyMMdd",date1));        caled.setTime(parseDate("yyyyMMdd",date2));          //設定時間為0時            calst.set(Calendar.HOUR_OF_DAY, 0);            calst.set(Calendar.MINUTE, 0);            calst.set(Calendar.SECOND, 0);            caled.set(Calendar.HOUR_OF_DAY, 0);            caled.set(Calendar.MINUTE, 0);            caled.set(Calendar.SECOND, 0);           //得到兩個日期相差的天數            int days = ((int)(caled.getTime().getTime()/1000)-(int)(calst.getTime().getTime()/1000))/3600/24;                    return days;       }

 

public static final int daysBetween(Date early, Date late) {               java.util.Calendar calst = java.util.Calendar.getInstance();            java.util.Calendar caled = java.util.Calendar.getInstance();            calst.setTime(early);             caled.setTime(late);             //設定時間為0時             calst.set(java.util.Calendar.HOUR_OF_DAY, 0);             calst.set(java.util.Calendar.MINUTE, 0);             calst.set(java.util.Calendar.SECOND, 0);             caled.set(java.util.Calendar.HOUR_OF_DAY, 0);             caled.set(java.util.Calendar.MINUTE, 0);             caled.set(java.util.Calendar.SECOND, 0);            //得到兩個日期相差的天數             int days = ((int) (caled.getTime().getTime() / 1000) - (int) (calst                    .getTime().getTime() / 1000)) / 3600 / 24;                      return days;       }              public static void main(String[] args)    {         Date earlydate = new Date();            Date latedate = new Date();            DateFormat df = DateFormat.getDateInstance();            try {                earlydate = df.parse("2009-09-21");                latedate = df.parse("2009-10-16");            } catch (ParseException e) {                  e.printStackTrace();              }             int days = daysBetween(earlydate,latedate);             System.out.println(days);       }

Java 計算兩個日期相差月數、天數