java 获取两个日期差_java如何获取两个日期的时间差

在 Java 中，可以使用 `java.time` 包中的 `LocalDate` 类来计算两个日期之间的差值。以下是一个示例代码：

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

public class DateDifference {
    public static void main(String[] args) {
        LocalDate date1 = LocalDate.of(2021, 1, 1);
        LocalDate date2 = LocalDate.of(2021, 3, 15);

        long daysBetween = ChronoUnit.DAYS.between(date1, date2);
        System.out.println("Days between " + date1 + " and " + date2 + ": " + daysBetween);

        long monthsBetween = ChronoUnit.MONTHS.between(date1, date2);
        System.out.println("Months between " + date1 + " and " + date2 + ": " + monthsBetween);

        long yearsBetween = ChronoUnit.YEARS.between(date1, date2);
        System.out.println("Years between " + date1 + " and " + date2 + ": " + yearsBetween);
    }
}

在这个示例中，我们创建了两个 `LocalDate` 对象，然后使用 `ChronoUnit` 枚举类中的 `DAYS`、`MONTHS` 和 `YEARS` 常量来计算它们之间的差值。最后输出结果。

你也可以使用 `Period` 类来计算两个日期之间的差值，如下所示：

import java.time.LocalDate;
import java.time.Period;

public class DateDifference {
    public static void main(String[] args) {
        LocalDate date1 = LocalDate.of(2021, 1, 1);
        LocalDate date2 = LocalDate.of(2021, 3, 15);

        Period period = Period.between(date1, date2);
        System.out.println("Days between " + date1 + " and " + date2 + ": " + period.getDays());
        System.out.println("Months between " + date1 + " and " + date2 + ": " + period.getMonths());
        System.out.println("Years between " + date1 + " and " + date2 + ": " + period.getYears());
    }
}

在这个示例中，我们使用 `Period` 类来计算两个日期之间的差值，并输出结果。`Period` 类提供了各种方法来获取差值的年、月、日等部分。