package org.yeshi.utils;

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

public class DateUtil {

	public static String dateDiff(String startTime, String endTime) {

		String datatime = 0 + "天" + 0 + "小时" + 0 + "分钟";
		SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

		try {
			long nm = 1000 * 60;// 一分钟的毫秒数
			long nh = 1000 * 60 * 60;// 一小时的毫秒数
			long nd = 1000 * 24 * 60 * 60;// 一天的毫秒数

			// 获得两个时间的毫秒时间差异
			long diff = sd.parse(endTime).getTime() - sd.parse(startTime).getTime();

			long day = diff / nd;// 计算差多少天
			long hour = diff % nd / nh;// 计算差多少小时
			long min = diff % nd % nh / nm;// 计算差多少分钟

			datatime = day + "天" + hour + "小时" + min + "分钟";

		} catch (ParseException e) {
			e.printStackTrace();
		}

		return datatime;
	}

	public static String dateDiff2(Date startTime, Date endTime) throws Exception {

		String datatime = 0 + "天" + 0 + "小时" + 0 + "分钟";

		long nm = 1000 * 60;// 一分钟的毫秒数
		long nh = 1000 * 60 * 60;// 一小时的毫秒数
		long nd = 1000 * 24 * 60 * 60;// 一天的毫秒数

		// 获得两个时间的毫秒时间差异
		long diff = endTime.getTime() - startTime.getTime();

		long day = diff / nd;// 计算差多少天
		long hour = diff % nd / nh;// 计算差多少小时
		long min = diff % nd % nh / nm;// 计算差多少分钟

		datatime = day + "天" + hour + "小时" + min + "分钟";

		return datatime;
	}
	
	/**
	 * 通过时间秒毫秒数判断两个时间的间隔
     * @param date1
     * @param date2
     * @return
     */
    public static int differentDaysByMillisecond(Date start, Date end) {
    	return (int) ((end.getTime() - start.getTime()) / (1000*3600*24));
    }
	
	public String transferLongToDate(String dateFormat, Long millSec) {
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		Date date = new Date(millSec);
		return sdf.format(date);
	}

	/**
	 * 验证是否属于同一天
	 * 
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static boolean isSameDay(Date date1, Date date2) {
		if (date1 != null && date2 != null) {
			Calendar cal1 = Calendar.getInstance();
			cal1.setTime(date1);
			Calendar cal2 = Calendar.getInstance();
			cal2.setTime(date2);
			return isSameDay(cal1, cal2);
		} else {
			return false;
		}
	}

	/**
	 * 验证是否属于同一天
	 * 
	 * @param cal1
	 * @param cal2
	 * @return
	 */
	public static boolean isSameDay(Calendar cal1, Calendar cal2) {
		if (cal1 != null && cal2 != null) {
			return cal1.get(0) == cal2.get(0) && cal1.get(1) == cal2.get(1) && cal1.get(6) == cal2.get(6);
		} else {
			return false;
		}
	}
	
	/**
	 * 指定日期加上天数后的日期
	 * 
	 * @param num
	 *            增加的天数
	 * @param nowDate
	 *            创建时间
	 * @return
	 * @throws ParseException
	 */
	public static String plusDay(int num, String nowDate) throws ParseException {
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Date currdate = format.parse(nowDate);
	
		Calendar ca = Calendar.getInstance();
		ca.setTime(currdate);
		ca.add(Calendar.DATE, num);
		
		return format.format(ca.getTime());
	}
	
	
	/**
	 * 指定日期加上天数后的日期
	 * 
	 * @param num
	 *            增加的天数
	 * @param nowDate
	 *            创建时间
	 * @return
	 * @throws ParseException
	 */
	public static String plusDay(int num, Date currdate) throws ParseException {
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
	
		Calendar ca = Calendar.getInstance();
		ca.setTime(currdate);
		ca.add(Calendar.DATE, num);
		
		return format.format(ca.getTime());
	}
	
	/**
	 * 指定日期减去天数后的日期
	 * 
	 * @param num
	 *            减去的天数
	 * @param nowDate
	 *            创建时间
	 * @return
	 * @throws ParseException
	 */
	public static String reduceDay(int num, String nowDate) throws ParseException {
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		Date currdate = format.parse(nowDate);
	
		Calendar ca = Calendar.getInstance();
		ca.setTime(currdate);
		ca.add(Calendar.DATE, -num); // 日期减 如果不够减会将月变动
		
		return format.format(ca.getTime());
	}
	
	  /**
     * 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));     
    } 
	
	/**
	 * 返回中间日期
	 * @param startTime
	 * @param endTime
	 * @return
	 * @throws Exception
	 */
	public static List<String> dayFactory(String startTime, String endTime) throws Exception {

		List<String> listDate = new ArrayList<String>();

		String plusDay = "";
		for (int i = 0; i < 1000; i++) {
			if (i == 0) {
				plusDay = startTime;
			} else {
				plusDay = DateUtil.plusDay(i, startTime);
			}

			listDate.add(plusDay);

			if (plusDay.equals(endTime)) {
				break; // 时间结束
			}
		}
		return listDate;
	}
	
	
	/**
     * @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 00:00:00");  
        Date d2=sdf.parse("2016-09-08 00:00:00");
        
        System.out.println(daysBetween(d1,d2));  
        System.out.println(daysBetween("2016-09-08 10:10:10","2016-09-29 00:00:00")); 
    }  

	
}