getallzones.html

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<TITLE>Retrieving Information on All Available Time Zones
(Java Developers Almanac Example)
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  <h3>
    e371.  
    Retrieving Information on All Available Time Zones</h3>

This example lists all time zones known by the JDK.


<pre>
    Date today = new Date();
    
    // Get all time zone ids
    String[] zoneIds = TimeZone.getAvailableIDs();
    
    // View every time zone
    for (int i=0; i&lt;zoneIds.length; i++) {
        // Get time zone by time zone id
        TimeZone tz = TimeZone.getTimeZone(zoneIds[i]);
    
        // Get the display name
        String shortName = tz.getDisplayName(tz.inDaylightTime(today), TimeZone.SHORT);
        String longName = tz.getDisplayName(tz.inDaylightTime(today), TimeZone.LONG);
    
        // Get the number of hours from GMT
        int rawOffset = tz.getRawOffset();
        int hour = rawOffset / (60*60*1000);
        int min = Math.abs(rawOffset / (60*1000)) % 60;
    
        // Does the time zone have a daylight savings time period?
        boolean hasDST = tz.useDaylightTime();
    
        // Is the time zone currently in a daylight savings time?
        boolean inDST = tz.inDaylightTime(today);
    }
</pre>
Here's a few time zone entries:

<pre>
    Id, Short Name, Long Name, Hour:Time from GMT
    
    ACT, CST, Central Standard Time (Northern Territory) 9:30
    AET, EST, Eastern Summer Time (New South Wales) 10:0
    AGT, ART, Argentine Time -3:0
    ART, EET, Eastern European Time 2:0
    AST, AKST, Alaska Standard Time -9:0
    Africa/Abidjan, GMT, Greenwich Mean Time 0:0
    Africa/Accra, GMT, Greenwich Mean Time 0:0
    Africa/Addis_Ababa, EAT, Eastern African Time 3:0
    Africa/Algiers, CET, Central European Time 1:0
    Africa/Asmera, EAT, Eastern African Time 3:0
    Africa/Bamako, GMT, Greenwich Mean Time 0:0
    Africa/Bangui, WAT, Western African Time 1:0
</pre>
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            &nbsp;Related Examples
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e369. <a class="eglink" href="GetCurTime.html?l=rel">
    Getting the Current Time
</a>
<br>

e370. <a class="eglink" href="GetTimeOtherZone.html?l=rel">
    Getting the Current Time in Another Time Zone
</a>
<br>

e372. <a class="eglink" href="GetTimeOtherZone2.html?l=rel">
    Converting Times Between Time Zones
</a>
<br>


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        See also: 
<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Arrays">
    Arrays
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Bits">
    Bits
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Collections">
    Collections
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Dates">
    Dates
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Hash%20Tables">
    Hash Tables
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Lists">
    Lists
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Property%20Files">
    Property Files
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sets">
    Sets
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Sorted%20Collections">
    Sorted Collections
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util/pkg.html?l=rel#Timers">
    Timers
</a>&nbsp;&nbsp;

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