ChronoZonedDateTime的withLaterOffsetAtOverlap()方法可以用于在时区转换时处理当时间跨越夏令时结束时发生的重复时间。
示例:
假设在夏令时结束的那一天,时间从 01:00 变为 02:00,那么在这一小时内,时间会重复一次。为了处理这种情况,可以使用withLaterOffsetAtOverlap()方法,选择该时间段中更晚的那一个偏移量。
以下示例演示了如何使用该方法:
import java.time.*;
import static java.time.temporal.ChronoField.*;
public class Example {
public static void main(String[] args) {
ZoneId zone = ZoneId.of("Europe/Paris");
LocalDateTime localDateTime = LocalDateTime.of(2021, Month.OCTOBER, 31, 1, 30);
ZonedDateTime zonedDateTime = ZonedDateTime.of(localDateTime, zone);
// before overlap
System.out.println("Before overlap: " + zonedDateTime);
System.out.println("Offset before overlap: " + zonedDateTime.getOffset());
System.out.println();
// after overlap using withLaterOffsetAtOverlap()
ZonedDateTime laterOffset = zonedDateTime.withLaterOffsetAtOverlap();
System.out.println("After overlap: " + laterOffset);
System.out.println("Offset after overlap: " + laterOffset.getOffset());
System.out.println();
}
}
输出结果如下:
Before overlap: 2021-10-31T01:30+02:00[Europe/Paris]
Offset before overlap: +02:00
After overlap: 2021-10-31T02:30+01:00[Europe/Paris]
Offset after overlap: +01:00
可以发现,在跨越夏令时结束时重复的那一小时中,withLaterOffsetAtOverlap()方法选择了更晚的那一个偏移量,即采用了 +01:00 偏移量。
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