Java Date Time - Instant.query() Examples

package com.logicbig.example.instant;

import java.time.Instant;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalUnit;

public class QueryExample {

    public static void main(String... args) {
        Instant i = Instant.now();
        System.out.println(i);

        TemporalUnit query = i.query(TemporalQueries.precision());
        System.out.println(query);
    }
}

package com.logicbig.example.instant;

import java.time.*;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalQuery;

public class QueryExample2 {

    public static void main(String... args) {
        Instant i = Instant.now();
        System.out.println(i);


        Duration d = i.query(durationSince2010Query);
        System.out.println(d);
    }

    public static final TemporalQuery<Duration> durationSince2010Query = new TemporalQuery<Duration>() {
        long since2010 = LocalDate.of(2010, 01, 01).atStartOfDay().toEpochSecond(ZoneOffset.UTC);

        @Override
        public Duration queryFrom(TemporalAccessor temporal) {

            if (temporal.isSupported(ChronoField.INSTANT_SECONDS)) {
                long l = temporal.getLong(ChronoField.INSTANT_SECONDS);
                return Duration.of(l -since2010, ChronoUnit.SECONDS);

            }
            return null;
        }
    };
}