package com.houserent.common.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * 日期工具類
 */
public class DateUtil {
    /**
     * @param args
     * @throws ParseException
     */
    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("2012-09-08 10:10:10");
        Date d2 = sdf.parse("2012-09-15 00:00:00");
        System.out.println(daysBetween(d1, d2));

//        System.out.println(daysBetween("2012-09-08 10:10:10", "2012-09-15 00:00:00"));
    }

    /**
     * 計算兩個日期之間相差的天數
     *
     * @param smdate 較小的時間
     * @param bdate  較大的時間
     * @return 相差天數
     * @throws ParseException
     */
    public static int daysBetween(Date smdate, Date bdate) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            smdate = sdf.parse(sdf.format(smdate));
            bdate = sdf.parse(sdf.format(bdate));
        } catch (ParseException e) {
            e.printStackTrace();
        }
        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));
    }

    /**
     * 字串的日期格式的計算
     */
    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));
    }

}