Beyond2037.java

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/*
 * @test
 * @bug 8073446 8262110
 * @summary Tests DST related beyond the year 2037
 * @run testng Beyond2037
 */

import java.text.SimpleDateFormat;
import java.util.TimeZone;

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import static org.testng.Assert.assertEquals;

@Test
public class Beyond2037 {

    @DataProvider
    Object[][] dstTransition() {
        return new Object[][] {
            {"2037/03/08 01:59:59:999", "2037/03/08 01:59:59:999"},
            {"2037/03/08 02:00:00:000", "2037/03/08 03:00:00:000"},
            {"2038/03/14 01:59:59:999", "2038/03/14 01:59:59:999"},
            {"2038/03/14 02:00:00:000", "2038/03/14 03:00:00:000"},
            {"2099/03/08 01:59:59:999", "2099/03/08 01:59:59:999"},
            {"2099/03/08 02:00:00:000", "2099/03/08 03:00:00:000"},
            {"2100/03/14 01:59:59:999", "2100/03/14 01:59:59:999"},
            {"2100/03/14 02:00:00:000", "2100/03/14 03:00:00:000"},
            {"8000/03/12 01:59:59:999", "8000/03/12 01:59:59:999"},
            {"8000/03/12 02:00:00:000", "8000/03/12 03:00:00:000"},
        };
    }

    @Test(dataProvider="dstTransition")
    public void testDstTransition(String source, String expected) throws Exception {
        var timeZone = TimeZone.getTimeZone("America/New_York");
        var sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSS" );
        sdf.setTimeZone(timeZone);
        assertEquals(sdf.format(sdf.parse(source)), expected);
    }

    @Test
    public void testGetOffset() throws Exception {
        var timeZone = TimeZone.getTimeZone("PST8PDT");
        var df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        df.setTimeZone(timeZone);
        var tMilli = df.parse("7681-03-09 03:20:49").getTime();
        assertEquals(timeZone.getOffset(tMilli), -25200000);
    }
}