我想计算两个时间段的差值,比如从19:00:00减去16:00:00。是否有Java函数可做到这一点?结果可以用毫秒、秒或分钟表示。
Java 8提供了一种更简洁的解决方案 - Instant和Duration
例:
import java.time.Duration;
import java.time.Instant;
...
Instant start = Instant.now();
//your code
Instant end = Instant.now();
Duration timeElapsed = Duration.between(start, end);
System.out.println("Time taken: "+ timeElapsed.toMillis() +" milliseconds");
System.out.println("Duration: " + String.valueOf(Duration.between(outerstart, Instant.now()).toMillis()));
用于记录持续时间。如果其他语言可以使用类似 print("Duration: " + str(time.time()-start))
的代码来完成此操作,那么我不认为这是 Java8 中一个好的、干净的解决方案... - Luc1小时15分钟3.022秒
而不是4503022毫秒
),则更容易进行调整。 - JakeRobbString time1 = "16:00:00";
String time2 = "19:00:00";
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
Date date1 = format.parse(time1);
Date date2 = format.parse(time2);
long difference = date2.getTime() - date1.getTime();
差异以毫秒为单位。
我修改了sfaizs的文章。
// d1, d2 are dates
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(diffDays + " days, ");
System.out.print(diffHours + " hours, ");
System.out.print(diffMinutes + " minutes, ");
System.out.print(diffSeconds + " seconds.");
Java 8
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime dateTime1= LocalDateTime.parse("2014-11-25 19:00:00", formatter);
LocalDateTime dateTime2= LocalDateTime.parse("2014-11-25 16:00:00", formatter);
long diffInMilli = java.time.Duration.between(dateTime1, dateTime2).toMillis();
long diffInSeconds = java.time.Duration.between(dateTime1, dateTime2).getSeconds();
long diffInMinutes = java.time.Duration.between(dateTime1, dateTime2).toMinutes();
就像任何其他语言一样,将您的时间段转换为Unix时间戳(即自Unix纪元以来的秒数),然后简单地相减。 然后,所得到的秒数应该被用作新的Unix时间戳,并以您想要的任何格式进行格式化。
啊,给上面的帖子(genesiss)应有的功劳,代码总是很方便的 ;) 不过,现在您也有了解释 :)
import java.util.Date;
...
Date d1 = new Date();
...
...
Date d2 = new Date();
System.out.println(d2.getTime()-d1.getTime()); //gives the time difference in milliseconds.
System.out.println((d2.getTime()-d1.getTime())/1000); //gives the time difference in seconds.
而且,为了以更好的格式显示,您可以使用:
DecimalFormat myDecimalFormatter = new DecimalFormat("###,###.###");
System.out.println(myDecimalFormatter.format(((double)d2.getTime()-d1.getTime())/1000));
LocalTime one = LocalTime.of(5,15);
LocalTime two = LocalTime.of(6,30);
LocalDate date = LocalDate.of(2019, 1, 29);
System.out.println(ChronoUnit.HOURS.between(one, two)); //1
System.out.println(ChronoUnit.MINUTES.between(one, two)); //75
System.out.println(ChronoUnit.MINUTES.between(one, date)); //DateTimeException
第一个示例显示的是取整而不是四舍五入。
第二个示例展示了计算不同单位的简易方法。
最后一个示例提醒我们在Java中不要搞混日期和时间 :)
Date start = new Date();
//Waiting for 10 seconds
Thread.sleep(10000);
Date end = new Date();
long diff = end.getTime() - start.getTime();
String TimeTaken = String.format("[%s] hours : [%s] mins : [%s] secs",
Long.toString(TimeUnit.MILLISECONDS.toHours(diff)),
TimeUnit.MILLISECONDS.toMinutes(diff),
TimeUnit.MILLISECONDS.toSeconds(diff));
System.out.println(String.format("Time taken %s", TimeTaken));
Time taken [0] hours : [0] mins : [10] secs
public class timeDifference {
public static void main(String[] args) {
try {
Date startTime = Calendar.getInstance().getTime();
Thread.sleep(10000);
Date endTime = Calendar.getInstance().getTime();
long difference = endTime.getTime() - startTime.getTime();
long differenceSeconds = difference / 1000 % 60;
long differenceMinutes = difference / (60 * 1000) % 60;
long differenceHours = difference / (60 * 60 * 1000) % 24;
long differenceDays = difference / (24 * 60 * 60 * 1000);
System.out.println(differenceDays + " days, ");
System.out.println(differenceHours + " hours, ");
System.out.println(differenceMinutes + " minutes, ");
System.out.println(differenceSeconds + " seconds.");
}
catch (Exception e) {
e.printStackTrace();
}
}
}
使用Java 8的LocalTime可以轻松实现此功能;
String time1 = "16:00:00";
String time2 = "19:00:00";
long seconds = Duration.between(LocalTime.parse(time1), LocalTime.parse(time2)).getSeconds()
Duration 还支持 toMillis() 和 toMinutes() 方法,可以代替 getSeconds() 方法来获取毫秒或分钟。