Java Date Time - OffsetDateTime.query() Examples

package com.logicbig.example.offsetdatetime;

import java.time.*;
import java.time.chrono.Chronology;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalUnit;

public class QueryExample {

    public static void main(String... args) {
        OffsetDateTime d = OffsetDateTime.of(2015, 11, 15, 18,
                20, 30, 100, ZoneOffset.ofHours(-6));

        Chronology c = d.query(TemporalQueries.chronology());
        System.out.println(c);

        LocalDate d2 = d.query(TemporalQueries.localDate());
        System.out.println(d2);

        LocalTime t = d.query(TemporalQueries.localTime());
        System.out.println(t);

        ZoneOffset z = d.query(TemporalQueries.offset());
        System.out.println(z);

        TemporalUnit p = d.query(TemporalQueries.precision());
        System.out.println(p);

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

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

package com.logicbig.example.offsetdatetime;

import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalQuery;

public class QueryExample2 {

    public static void main(String... args) {
        OffsetDateTime d = OffsetDateTime.of(2015, 11, 15, 18,
                20, 30, 100, ZoneOffset.ofHours(-5));


        Boolean b = d.query(ValidTimeZoneQuery);
        System.out.println(b);

    }

    public static final TemporalQuery<Boolean> ValidTimeZoneQuery = new TemporalQuery<Boolean>() {
        @Override
        public Boolean queryFrom(TemporalAccessor temporal) {
            Instant instant = Instant.now();
            ZoneId systemZone = ZoneId.systemDefault();
            ZoneOffset z1 = systemZone.getRules().getOffset(instant);
            ZoneOffset z2 = ZoneOffset.from(temporal);
            return z1.equals(z2);
        }
    };
}