Name: joT67522 Date: 10/24/97


The attached applet exhibits a long time zone name
which is different from the name in the TimeZone.java
SimpleTimeZone table comments. (The Comment column was
added by hand.)


Ordinal ID rawOffset(hh:mm) dstOffset(hh:mm) long name Comment
19 AST -09:00 -09:00 Atlantic Standard Time Alaska Standard Time

/*
 * @(#)TZApplet.java 1.0 9/19/1997
 *
 * Copyright (c) 1997 by Sun Microsystems, Inc. All Rights Reserved
 *
 * Date Author Change
 * 9/19/97 Wally Wedel Created
 *
 */

import java.applet.*;

import java.awt.Color;
import java.awt.GridLayout;

import java.text.SimpleDateFormat;
import java.text.FieldPosition;

import java.util.Calendar;
import java.util.Date;
import java.util.SimpleTimeZone;
import java.util.TimeZone;

// import jclass.bwt.JCMultiColumnList;

/**
  * TZApplet is a class to test JDK 1.1 time zone support.
 *
 * @author Wally Wedel
 *
 */
public class TZApplet extends Applet {
    int MILLISPERHOUR = 60*60*1000;
    /**
     * Construct myself with default values.
    **/
    public TZApplet() {
        super();
    }
    /**
     * A few simple tests.
    **/
    public void init() {
        String[] cols = {"Ordinal","ID","GMTOffset", "DSTOffset","Name"};
        /*
         * Instantiate a TimeZone so we can get the ids.
         */
        TimeZone tz = new SimpleTimeZone(-7*MILLISPERHOUR,"PNT");
        /*
         * Computational variables.
         */
        int offset, rawOffset, minutesOffset, hours, minutes, rHours, rMinutes;
        /*
         * Instantiate a SimpleDateFormat set up to produce a full time zone name.
         */
        SimpleDateFormat sdf = new SimpleDateFormat("zzzz");
        /*
         * A String array for the time zone ids.
         */
        String[] ids = tz.getAvailableIDs();
        /*
         * Instantiate a Date.
         */
        Date aDay = new Date(1997,1,1);
        /*
         * How many ids do we have?
         */
        System.out.println(" Time Zone IDs size: " + ids.length);
        /*
         * Column headings (sort of)
         */
        System.out.println("Ordinal ID rawOffset(hh:mm) dstOffset(hh:mm) name");
        setLayout(new GridLayout(1,1));
        setBackground(Color.lightGray);
        // JCMultiColumnList mcl = new JCMultiColumnList();

        /*
         * Loop through the tzs.
         */
        for (int i = 0; i < ids.length; i++) {
            // System.out.println(i + " " + ids[i]);
            TimeZone ttz = tz.getTimeZone(ids[i]);
            rawOffset = ttz.getRawOffset();
            offset = getDSTOffset(ttz, aDay);

            char sign = '+';
            if (offset < 0) {
                sign = '-';
                offset = -offset;
                rawOffset = -rawOffset;
            }

            // System.out.println(i + " " + ids[i] + " offset " + offset);
            rHours = rawOffset/3600000;
            hours = offset/3600000;
            rMinutes = (rawOffset%3600000)/60000;
            minutes = (offset%3600000)/60000;

            String dstOffset = "" + sign + (hours < 10 ? "0" : "") +
                    hours + ':' + (minutes < 10 ? "0" : "") + minutes;
            String gmtOffset = "" + sign + (rHours < 10 ? "0" : "") +
                    rHours + ':' + (rMinutes < 10 ? "0" : "") + rMinutes;

            // System.out.println(i + " " + ids[i] + " offset " + hours + ":" + minutes);
            sdf.setTimeZone(ttz);
            /*
             * Format the output.
             */
            StringBuffer tzS = new StringBuffer();
            sdf.format(aDay,tzS, new FieldPosition(0));
            /*
             * Show our result.
             */
            System.out.println(i + " " + ids[i] + " " + gmtOffset + " " + dstOffset + " " + tzS);
            String row = (new Integer(i)).toString() + "|" + ids[i] + "|" + gmtOffset + "|" + dstOffset + "|" + tzS.toString();
            // mcl.addItem(row,'|');


        }
        // mcl.setColumnButtons(cols);
        // add(mcl);
    }

    public void start() {
    }

    public void stop() {
    }

    public void destroy() {
    }

    public int getDSTOffset(TimeZone tz, Date date) {
        /*
         * Instantiate a Calendar so we can get DST offset.
         */
        Calendar cal = Calendar.getInstance();
        cal.setTimeZone(tz);
        cal.setTime(date);
        return cal.get(Calendar.ZONE_OFFSET) +
                    cal.get(Calendar.DST_OFFSET);
    }

    public static void main(String args[]) {
Applet a = new TZApplet();
a.init();
    }
}




The proper acronym per the NIH tables is AKST but that's more than three
letters! Here are the pertinent comments from the NIH northamerica data:

# From Bob Devine (1988-01-28):
# ...Alaska (and Hawaii) had the timezone names changed in 1967.
# old new
# Pacific Standard Time(PST) -same-
# Yukon Standard Time(YST) -same-
# Central Alaska S.T. (CAT) Alaska-Hawaii St[an]dard Time (AHST)
# Nome Standard Time (NT) Bering Standard Time (BST)
#
# ...Alaska's timezone lines were redrawn in 1983 to give only 2 tz.
# The YST zone now covers nearly all of the state, AHST just part
# of the Aleutian islands. No DST.

# From Paul Eggert (1995-12-19):
# The tables below use `NST', not `NT', for Nome Standard Time.
# I invented `CAWT' for Central Alaska War Time.

# From U. S. Naval Observatory (1989-01-19):
# USA EASTERN 5 H BEHIND UTC NEW YORK, WASHINGTON
# USA EASTERN 4 H BEHIND UTC APR 3 - OCT 30
# USA CENTRAL 6 H BEHIND UTC CHICAGO, HOUSTON
# USA CENTRAL 5 H BEHIND UTC APR 3 - OCT 30
# USA MOUNTAIN 7 H BEHIND UTC DENVER
# USA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 30
# USA PACIFIC 8 H BEHIND UTC L.A., SAN FRANCISCO
# USA PACIFIC 7 H BEHIND UTC APR 3 - OCT 30
# USA ALASKA STD 9 H BEHIND UTC MOST OF ALASKA (AKST)
# USA ALASKA STD 8 H BEHIND UTC APR 3 - OCT 30 (AKDT)
# USA ALEUTIAN 10 H BEHIND UTC ISLANDS WEST OF 170W
# USA - " - 9 H BEHIND UTC APR 3 - OCT 30
# USA HAWAII 10 H BEHIND UTC
# USA BERING 11 H BEHIND UTC SAMOA, MIDWAY

# From Arthur David Olson (1989-01-21):
# The above dates are for 1988.
# Note the "AKST" and "AKDT" abbreviations, the claim that there's
# no DST in Samoa, and the claim that there is DST in Alaska and the
# Aleutians.

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