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:
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:
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