Is there any way to convert ZoneId to ZoneOffset in java 8?

Question

I have an epoch second and a zoneId,by method1.It can be convert to LocalDateTime with system default zoneId,but I don\'t find the way to convert epoch second to LocalDateTi

Answer 1

I have an epoch second and a zoneId. Is there any way to convert ZoneId to ZoneOffset in java 8?

1. Get ZonedDateTime from epoch second and Zone Id
2. Get ZoneOffset from ZonedDateTime

Demo:

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;

public class Main {
    public static void main(String[] args) {
        // Get ZonedDateTime from epoch second and Zone Id
        ZonedDateTime zdt = Instant.ofEpochSecond(1597615462L).atZone(ZoneId.of("Europe/London"));

        // Get ZoneOffset from ZonedDateTime
        ZoneOffset offset = zdt.getOffset();

        System.out.println(offset);
    }
}

Output:

+01:00