AncientDays.java

import java.time.Instant;
import java.time.ZonedDateTime;
import java.time.ZoneId;
import java.util.Calendar;
import java.util.Locale;
import org.joda.time.DateTimeZone;

public class AncientDays {
    public static void main(String[] args) {
        final ZonedDateTime zoned = ZonedDateTime.of(1000, 1, 1, 0, 0, 0, 0, ZoneId.of("Asia/Tokyo"));
        final Instant instant = zoned.toInstant();
        System.out.println(instant.getEpochSecond());

        final Calendar cal = Calendar.getInstance(DateTimeZone.forID("Asia/Tokyo").toTimeZone(), Locale.ENGLISH);
        cal.setTimeInMillis(instant.getEpochSecond() * 1000L);
        System.out.println(String.format(Locale.ENGLISH, "%02d-%02d-%02d",
                cal.get(Calendar.YEAR),
                cal.get(Calendar.MONTH) + 1,
                cal.get(Calendar.DAY_OF_MONTH)));
    }
}

build.gradle

apply plugin: 'java'

repositories {
    mavenCentral()
}

dependencies {
    compile 'joda-time:joda-time:2.9.2'
}

sourceSets {
    main {
        java {
            srcDir '.'
        }
    }
}

task run(type: JavaExec) {
    main = project.hasProperty('main') ? project.getProperty('main') : 'AncientDays'
    classpath = sourceSets.main.runtimeClasspath
}

$ ./gradlew run
:compileJava
:processResources UP-TO-DATE
:classes
:run
-30610257539
999-12-26

BUILD SUCCESSFUL

Total time: 1.053 secs