如何用 Java 计算时差？

我想从19:00减去两个时间周期，比如16:00:00从19:00。有什么 Java 函数可以做到这一点吗？结果可以是毫秒、秒或分钟。

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小开
最佳答案 
String 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();

差别是毫秒。

我修改了 Sfaizs Post。

小开

就像任何其他语言一样，将时间周期转换为 Unix 时间戳(即 Unix 时代以来的秒数) ，然后简单地进行减法。 然后，生成的秒应该被用作一个新的 unix 时间戳，并以任何您想要的格式读取。

Ah, give the above poster (genesiss) his due credit, code's always handy ;) 不过，现在你也有了一个解释:)

小开

最痛苦的方法是转换成毫米，然后做减法，然后回到任何你想要的秒数。更好的方法是使用 JodaTime。

小开

那就是时间差太大了

// 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.");
小开

爪哇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();
小开 
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.

并且，为了更好地显示格式，您可以使用:

    DecimalFormat myDecimalFormatter = new DecimalFormat("###,###.###");
System.out.println(myDecimalFormatter.format(((double)d2.getTime()-d1.getTime())/1000));
小开

Java8有一个 cleaner solution即时和持续时间

例如:

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");
小开

如果选择不同的时间，例如: 22:00和01:55。

public static long getDiffTime(Date date1, Date date2){
if (date2.getTime() - date1.getTime() < 0) {// if for example date1 = 22:00, date2 = 01:55.
Calendar c = Calendar.getInstance();
c.setTime(date2);
c.add(Calendar.DATE, 1);
date2 = c.getTime();
} //else for example date1 = 01:55, date2 = 03:55.
long ms = date2.getTime() - date1.getTime();


//235 minutes ~ 4 hours for (22:00 -- 01:55).
//120 minutes ~ 2 hours for (01:55 -- 03:55).
return TimeUnit.MINUTES.convert(ms, TimeUnit.MILLISECONDS);
}
小开 
    /*
* Total time calculation.
*/
private void getTotalHours() {
try {
// TODO Auto-generated method stub
if (tfTimeIn.getValue() != null && tfTimeOut.getValue() != null) {
Long min1 = tfTimeOut.getMinutesValue();
Long min2 = tfTimeIn.getMinutesValue();
Long hr1 = tfTimeOut.getHoursValue();
Long hr2 = tfTimeIn.getHoursValue();
Long hrsTotal = new Long("0");
Long minTotal = new Long("0");
if ((hr2 - hr1) == 1) {
hrsTotal = (long) 1;
if (min1 != 0 && min2 == 0) {
minTotal = (long) 60 - min1;
} else if (min1 == 0 && min2 != 0) {
minTotal = min2;
} else if (min1 != 0 && min2 != 0) {
minTotal = min2;
Long minOne = (long) 60 - min1;
Long minTwo = min2;
minTotal = minOne + minTwo;
}
if (minTotal >= 60) {
hrsTotal++;
minTotal = minTotal % 60;
}
} else if ((hr2 - hr1) > 0) {
hrsTotal = (hr2 - hr1);
if (min1 != 0 && min2 == 0) {
minTotal = (long) 60 - min1;
} else if (min1 == 0 && min2 != 0) {
minTotal = min2;
} else if (min1 != 0 && min2 != 0) {
minTotal = min2;
Long minOne = (long) 60 - min1;
Long minTwo = min2;
minTotal = minOne + minTwo;
}
if (minTotal >= 60) {
minTotal = minTotal % 60;
}
} else if ((hr2 - hr1) == 0) {
if (min1 != 0 || min2 != 0) {
if (min2 > min1) {
hrsTotal = (long) 0;
minTotal = min2 - min1;
} else {
Notification.show("Enter A Valid Time");
tfTotalTime.setValue("00.00");
}
}
} else {
Notification.show("Enter A Valid Time");
tfTotalTime.setValue("00.00");
}
String hrsTotalString = hrsTotal.toString();
String minTotalString = minTotal.toString();
if (hrsTotalString.trim().length() == 1) {
hrsTotalString = "0" + hrsTotalString;
}
if (minTotalString.trim().length() == 1) {
minTotalString = "0" + minTotalString;
}
tfTotalTime.setValue(hrsTotalString + ":" + minTotalString);
} else {
tfTotalTime.setValue("00.00");
}
}
catch (Exception e) {
e.printStackTrace();
}
}
小开 
class TimeCalculator
{
String updateTime;


public TimeCalculator(String time)
{
// Time should be in 24 hours format like 15/06/2016 17:39:20
this.updateTime = time;
}


public String getTimeDifference()
{
String td = null;


// Get Current Time
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss");
Date currentDate = new Date();
Calendar calendar = new GregorianCalendar();
calendar.setTime(currentDate);


int c_year = calendar.get(Calendar.YEAR);
int c_month = calendar.get(Calendar.MONTH) + 1;
int c_day = calendar.get(Calendar.DAY_OF_MONTH);


// Get Editing Time


Date edit_date = sdf.parse(updateTime);
Calendar edit_calendar = new GregorianCalendar();
edit_calendar.setTime(edit_date);


int e_year = edit_calendar.get(Calendar.YEAR);
int e_month = edit_calendar.get(Calendar.MONTH) + 1;
int e_day = edit_calendar.get(Calendar.DAY_OF_MONTH);


if(e_year == c_year && e_month == c_month && e_day == c_day)
{
int c_hours = calendar.get(Calendar.HOUR_OF_DAY);
int c_minutes = calendar.get(Calendar.MINUTE);
int c_seconds = calendar.get(Calendar.SECOND);


int e_hours = edit_calendar.get(Calendar.HOUR_OF_DAY);
int e_minutes = edit_calendar.get(Calendar.MINUTE);
int e_seconds = edit_calendar.get(Calendar.SECOND);


if(c_hours == e_hours && c_minutes == e_minutes && c_seconds == e_seconds)
{
td = "just now";
return td;
}
else if(c_hours == e_hours && c_minutes == e_minutes)
{
int d_seconds = c_seconds-e_seconds;
td = String.valueOf(d_seconds);
td = td + " seconds ago";
return td;
}
else if(c_hours == e_hours && c_minutes != e_minutes)
{
int d_minutes = c_minutes-e_minutes;
int d_seconds;
if(c_seconds>e_seconds)
{
d_seconds = c_seconds-e_seconds;
}
else
{
d_seconds = e_seconds-c_seconds;
}
td = "00:" + String.valueOf(d_minutes) + ":" + String.valueOf(d_seconds) + " ago";
return td;
}
else
{
int d_minutes, d_seconds, d_hours;
d_hours = c_hours-e_hours;
if(c_minutes>e_minutes)
{
d_minutes = c_minutes - e_minutes;
}
else
{
d_minutes = e_minutes - c_minutes;
}
if(c_seconds>e_seconds)
{
d_seconds = c_seconds - e_seconds;
}
else
{
d_seconds = e_seconds - c_seconds;
}


td = String.valueOf(d_hours) + ":" + String.valueOf(d_minutes) + ":" + String.valueOf(d_seconds) + " ago";
return td;
}
}
else if(e_year == c_year && e_month == c_month && c_day == e_day+1)
{
td = "yesterday";
return td;
}
else
{
td = updateTime;
return td;
}
}


}
小开 
String start = "12:00:00";
String end = "02:05:00";


SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");


Date date1 = format.parse(start);


Date date2 = format.parse(end);


long difference = date2.getTime() - date1.getTime();


int minutes = (int) TimeUnit.MILLISECONDS.toMinutes(difference);


if(minutes<0)minutes += 1440;

现在分钟将是两次之间的正确持续时间(以分钟为单位)。

小开 
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();
}
}
}
小开 
import java.text.SimpleDateFormat;
import java.util.Date;


public class Main {


public static void main(String[] args) throws Exception {
String time1 = "12:00:00";
String time2 = "12:01:00";
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
Date date1 = format.parse(time1);
Date date2 = format.parse(time2);
long difference = date2.getTime() - date1.getTime();
System.out.println(difference/1000);
}
}

它抛出解析异常的异常句柄。

小开

试试这个:

public String timeDifference8(String startTime, String endTime) {
LocalTime initialTime = LocalTime.parse(startTime);
LocalTime finalTime =LocalTime.parse(endTime);
StringJoiner joiner = new StringJoiner(":");
long hours = initialTime.until( finalTime, ChronoUnit.HOURS);
initialTime = initialTime.plusHours( hours );
long minutes = initialTime.until(finalTime, ChronoUnit.MINUTES);
initialTime = initialTime.plusMinutes( minutes );
long seconds = initialTime.until( finalTime, ChronoUnit.SECONDS);
joiner.add(String.valueOf(hours));
joiner.add(String.valueOf(minutes));
joiner.add(String.valueOf(seconds));
return joiner.toString();
}
小开

除了使用最常见的统计期和持续时间对象的方法之外，您还可以通过其他方法扩展您在 Java 中处理时间的知识。

高级 Java8库。 ChronoUnit 用于差异。

ChronoUnit is a great way to determine how far apart two Temporal values are. Temporal includes LocalDate, 本地时间 and so on.

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

第一个例子展示了截断之间而不是整数之间的关系。

第二个例子展示了计算不同单位的容易程度。

最后一个例子提醒我们，在 Java 中不应该搞错日期和时间:)

小开 
import java.sql.*;


class Time3 {


public static void main(String args[]){
String time1 = "01:03:23";
String time2 = "02:32:00";
long difference ;
Time t1 = Time.valueOf(time1);
Time t2 = Time.valueOf(time2);
if(t2.getTime() >= t1.getTime()){
difference = t2.getTime() - t1.getTime() -19800000;
}
else{
difference = t1.getTime() - t2.getTime() -19800000;
}


java.sql.Time time = new java.sql.Time(difference);
System.out.println(time);
}


}
小开

我找到了这个清洁工。

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));

输出

Time taken [0] hours : [0] mins : [10] secs
小开

这可以使用 Java8 LocalTime 轻松完成;

String time1 = "16:00:00";
String time2 = "19:00:00";


long seconds = Duration.between(LocalTime.parse(time1), LocalTime.parse(time2)).getSeconds()

Duration also supports toMillis(), toMinutes() which can be used in place of getSeconds() to get milliseconds or minutes

小开

使用即时通讯软件

        Instant start = Instant.parse("2017-10-03T10:15:30.00Z");
Instant end = Instant.parse("2017-10-04T11:35:31.00Z");


long duration = Duration.between(start, end).toMillis();
long minutes = TimeUnit.MILLISECONDS.toMinutes(duration)*60;
String time = String.format("%02d hours, %02d min, %02d sec",
TimeUnit.MILLISECONDS.toHours(duration),
TimeUnit.MILLISECONDS.toMinutes(duration) -  TimeUnit.MILLISECONDS.toHours(duration) * 60,
TimeUnit.MILLISECONDS.toSeconds(duration) - minutes);
;
System.out.println("time = " + time);

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