http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.asn1.test;

import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;

import org.bouncycastle.asn1.DERGeneralizedTime;
import org.bouncycastle.asn1.DERUTCTime;
import org.bouncycastle.util.test.SimpleTest;

public class LocaleTest
    extends SimpleTest
{
    public String getName()
    {
        return "LocaleTest";
    }

    private void doTestLocale(Locale l)
        throws Exception
    {
        long time = 1538063166000L;
        String timeString = "180927154606GMT+00:00";
        String longTimeString = "20180927154606Z";

        Locale.setDefault(l);

        isTrue(time == new DERUTCTime(timeString).getAdjustedDate().getTime());
        isTrue(time == new DERGeneralizedTime(longTimeString).getDate().getTime());

        isTrue(time == new DERUTCTime(new Date(time)).getAdjustedDate().getTime());
        isTrue(time == new DERGeneralizedTime(new Date(time)).getDate().getTime());

        Date d = new Date();

        isTrue((d.getTime() - (d.getTime() % 1000)) == new DERUTCTime(d).getAdjustedDate().getTime());
        isTrue((d.getTime() - (d.getTime() % 1000)) == new DERGeneralizedTime(d).getDate().getTime());
    }

    public void performTest()
        throws Exception
    {
        Locale defLocale = Locale.getDefault();

        Locale list[] = DateFormat.getAvailableLocales();
        for (int i = 0; i != list.length; i++)
        {
            doTestLocale(list[i]);
        }

        Locale.setDefault(defLocale);
    }

    public static void main(
        String[] args)
    {
        runTest(new LocaleTest());
    }
}