Java Date Time - ZoneOffset.query() Examples

package com.logicbig.example.zoneoffset;

import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.temporal.TemporalQueries;

public class QueryExample {

    public static void main(String... args) {
        ZoneOffset z = ZoneOffset.of("-6");
        System.out.println(z);

        ZoneId z2 = z.query(TemporalQueries.zone());
        System.out.println(z2);

        ZoneId z3 = z.query(TemporalQueries.zoneId());
        System.out.println(z3);
    }
}

package com.logicbig.example.zoneoffset;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoField;
import java.time.temporal.TemporalQuery;
import java.util.ArrayList;
import java.util.List;

public class QueryExample2 {

    public static void main(String... args) {

        ZoneOffset z = ZonedDateTime.now().getOffset();
        System.out.println(z);

        List<ZoneId> list = z.query(zonesOfSameOffsets);
        list.forEach(System.out::println);
    }

    static TemporalQuery<List<ZoneId>> zonesOfSameOffsets = temporal -> {
        List<ZoneId> zones = new ArrayList<>();
        if (temporal.isSupported(ChronoField.OFFSET_SECONDS)) {
            ZoneOffset z = ZoneOffset.from(temporal);
            for (String s : ZoneOffset.getAvailableZoneIds()) {
                ZoneId zid = ZoneId.of(s);
                ZoneOffset offset = zid.getRules()
                                     .getOffset(Instant.now());
                if (z.compareTo(offset)==0) {
                       zones.add(zid);
                }
            }
        }
        return zones;
    };
}