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  • Java计算日期和时间差

    这篇文章将使用两个例子计算两个日期的时间差。
    1.使用Java SDK。
    2.使用Joda库。
    1.使用Java SDK
     计算两个Date之间的时间差,基本思路为把Date转换为ms(微秒),然后计算两个微秒时间差。时间的兑换规则如下:

    1s秒 = 1000ms毫秒 1min分种 = 60s秒 1hours小时 = 60min分钟 1day天 = 24hours小时
    package com.qiyadeng.date;
    
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    public class DateDifferentExample {
        public static void main(String[] args) {
            String dateStart = "2013-02-19 09:29:58";
            String dateStop = "2013-02-20 11:31:48";
    
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
            Date d1 = null;
            Date d2 = null;
    
            try {
                d1 = format.parse(dateStart);
                d2 = format.parse(dateStop);
    
                //毫秒ms
                long diff = d2.getTime() - d1.getTime();
    
                long diffSeconds = diff / 1000 % 60;
                long diffMinutes = diff / (60 * 1000) % 60;
                long diffHours = diff / (60 * 60 * 1000) % 24;
                long diffDays = diff / (24 * 60 * 60 * 1000);
    
                System.out.print("两个时间相差:");
                System.out.print(diffDays + " 天, ");
                System.out.print(diffHours + " 小时, ");
                System.out.print(diffMinutes + " 分钟, ");
                System.out.print(diffSeconds + " 秒.");
    
            } catch (Exception e) {
                e.printStackTrace();
            }
    
        }
    }
    

      

    运行结果:

    两个时间相差:1 天, 2 小时, 1 分钟, 50 秒.

    2.Joda时间库

    使用 joda-time-1.6.2 jar包  资源连接地址:http://www.java2s.com/Code/Jar/j/Downloadjodatime162jar.htm

    package util;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    import org.joda.time.DateTime;
    import org.joda.time.Days;
    import org.joda.time.Hours;
    import org.joda.time.Minutes;
    import org.joda.time.Seconds;
    
    public class TimeDiffUtil {
    	
    	public Integer getTimeDifference(String time) {
    		SimpleDateFormat date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    		String endTime = time;
    		String nowDate = date.format(new Date());
    		Date now = null;
    		Date end = null ;
    		try {
    			now = date.parse(nowDate);
    			end = date.parse(endTime);
    		} catch (ParseException e) {
    			e.printStackTrace();
    		}
    		return Days.daysBetween(new DateTime(end), new DateTime(now)).getDays();
    	}
    	
    	public static void main(String[] args) throws ParseException  {
    	  System.out.println(new TimeDiffUtil().getTimeDifference("2015-01-01 00:00:00"));
    		

      /**以下内容被放在getTimeDifference()方法中*/
    	  /*String dateStart = "2013-02-19 09:29:58";
              String dateStop = "2015-01-01 11:31:48";
    
              SimpleDateFormat date = new SimpleDateFormat("yyyy-MM-dd");
              dateStart = date.format(new Date());
    
              Date d1 = null;
              Date d2 = null;
    
              try {
                  d1 = date.parse(dateStart);
                  d2 = date.parse(dateStop);
    
                  DateTime dt1 = new DateTime(d1);
                  DateTime dt2 = new DateTime(d2);
    
                  System.out.print("两个时间相差:");
                  System.out.print(-Days.daysBetween(dt1, dt2).getDays() + " 天, ");
                  System.out.print(Hours.hoursBetween(dt1, dt2).getHours() % 24 + " 小时, ");
                  System.out.print(Minutes.minutesBetween(dt1, dt2).getMinutes() % 60 + " 分钟, ");
                  System.out.print(Seconds.secondsBetween(dt1, dt2).getSeconds() % 60 + " 秒.");
    
              } catch (Exception e) {
                  e.printStackTrace();
              }*/
    	}
    
    }
    

      

    运行结果:

    两个时间相差:1 天, 2 小时, 1 分钟, 50 秒.
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  • 原文地址:https://www.cnblogs.com/a757956132/p/4208415.html
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