概述

Java示例，使用Java 8计算中两个日期之间的差异。首先，我们将学习使用Jodatime API来计算，该API在Java 8发布之前就已经可用了。如果您仍然不习惯使用Java 8，那么JodaTime应该是你的首选。

JodaTime 两个日期时间之差

MAVEN

<dependency>
 <groupId>joda-time</groupId>
 <artifactId>joda-time</artifactId>
 <version>2.10</version>
</dependency>
 

示例

由于大家都喜欢喜欢性，建议使用Jodatime库（它实际上启发了 Java 8 date/time APIs）。

public void difference_between_two_dates_duration_Joda()
 {
 DateTime dateOfBirth = new DateTime(1988, 7, 4, 0, 0, GregorianChronology. getInstance ());
 DateTime currentDate = new DateTime();
 Days diffInDays = Days.daysBetween(dateOfBirth, currentDate);
 Hours diffInHours = Hours.hoursBetween(dateOfBirth, currentDate);
 Minutes diffInMinutes = Minutes.minutesBetween(dateOfBirth, currentDate);
 Seconds seconds = Seconds.secondsBetween(dateOfBirth, currentDate);
 }
 

Java 8 两个日期时间之差

Java Date一直缺乏足够的支持来有效地表达日期和时间段。Java 8首次尝试升级此date/time API。如果你在项目中使用的是Java 8，则一定要使用以下两种方法之一来计算两个日期之间的日期/时间差。

java.time.Period示例，计算天/月/年的时间差

可使用Period类获取两时期的两个日期之间的差。

LocalDate endofCentury = LocalDate.of(2014, 01, 01);
LocalDate now = LocalDate.now();

Period  diff  = Period.between(endofCentury, now);

System.out. printf ("Difference is %d years, %d months and %d days old",
 diff.getYears(), diff.getMonths(), diff.getDays());
 

java.time.temporal.ChronoUnit示例，计算天/月/年的差

可使用ChronoUnit类获得数月之内两个日期之间的差。

public void difference_between_two_dates_java8(){
 LocalDate dateOfBirth = LocalDate.of(1980, Month.JULY, 4);
 LocalDate currentDate = LocalDate.now();
 long diffInDays = ChronoUnit.DAYS.between(dateOfBirth, currentDate);
 long diffInMonths = ChronoUnit.MONTHS.between(dateOfBirth, currentDate);
 long diffInYears = ChronoUnit.YEARS.between(dateOfBirth, currentDate);
}
 

你可以使用ChronoUnit来计算更小的 时间单位 ，如几分钟，分钟等。但是在这种情况下，你必须使用LocalDateTime来代替第一个示例中使用的LocalDate。

public void difference_between_two_dates_duration()
 {
 LocalDateTime dateTime = LocalDateTime.of(1988, 7, 4, 0, 0);
 LocalDateTime dateTime2 = LocalDateTime.now();
 long diffInNano = ChronoUnit.NANOS.between(dateTime, dateTime2);
 long diffInSeconds = ChronoUnit.SECONDS.between(dateTime, dateTime2);
 long diffInMilli = ChronoUnit.MILLIS.between(dateTime, dateTime2);
 long diffInMinutes = ChronoUnit.MINUTES.between(dateTime, dateTime2);
 long diffInHours = ChronoUnit.HOURS.between(dateTime, dateTime2);
 }
 

java.time.Duration示例，计算毫米/秒/分钟等的差

可使用Duration类来获取以毫米为单位的两个日期之间的差。

public void difference_between_two_dates_duration()
 {
 LocalDateTime dateTime = LocalDateTime.of(1988, 7, 4, 0, 0);
 LocalDateTime dateTime2 = LocalDateTime.now();
 int diffInNano = java.time.Duration.between(dateTime, dateTime2).getNano();
 long diffInSeconds = java.time.Duration.between(dateTime, dateTime2).getSeconds();
 long diffInMilli = java.time.Duration.between(dateTime, dateTime2).toMillis();
 long diffInMinutes = java.time.Duration.between(dateTime, dateTime2).toMinutes();
 long diffInHours = java.time.Duration.between(dateTime, dateTime2).toHours();
 }
 

以上三种方法都具有足够的初步性和重要性，可以知道不同时间单位的日期之间的差异。

译文链接：Java 8两个日期之间的差异