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.
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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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