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17 December 2008
Getting a Complete List of Timezones from Java

I've been doing some research on i18n, locales, timezones, and all that jazz lately. Today I wanted to build a dropdown list of possible timezones, and came across a bit of Java code that I converted to CFSCRIPT. Thought I'd share it in case anybody else finds it useful. I will say that there are a LOT more timezones than I would have ever guessed (592 to be exact), and the results of my snippet probably aren't useful as-is to populate a dropdown; but, at least you do have a way to access what your CF server's JVM knows about, and you can filter it as you like.

Oh, I ran this code under CF8; not sure what it does under earlier versions.

The Code:

<!--- create list of valid time zones using java... --->

<cfscript>

tz = createobject("java","java.util.TimeZone");

aTZID = tz.getAvailableIDs();

today = now();

aTZs = arraynew(1);

for(i=1;i<=arraylen(aTZID);i=i+1){

tmptz = tz.getTimeZone(aTZID[i]);

stThisTZ = structnew();

stThisTZ.id = aTZID[i];

// Get the display name

stThisTZ.shortName = tmptz.getDisplayName(tmptz.inDaylightTime(today), tz.SHORT);

stThisTZ.longName = tmptz.getDisplayName(tmptz.inDaylightTime(today), tz.LONG);

stThisTZ.readableName = tmptz.getDisplayName();

 

// Get the number of hours from GMT

rawOffset = tmptz.getRawOffset();

stThisTZ.offset = rawOffset / (60*60*1000);

stThisTZ.offsetMinutes = abs(rawOffset / (60*1000)) % 60;

 

// Does the time zone have a daylight savings time period?

stThisTZ.hasDST = tmptz.useDaylightTime();

 

// Is the time zone currently in a daylight savings time?

stThisTZ.inDST = tmptz.inDaylightTime(today);

arrayAppend(aTZs,structcopy(stThisTZ));

}

</cfscript>

<cfdump var="#aTZs#">


screenshot of the output:
screenshot of output of timezones retrieved via java timezone object




Posted by dougboude at 7:16 AM | PRINT THIS POST! |Link | 3 comments
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Re: Getting a Complete List of Timezones from Java
Posted by PaulH on December 17, 2008 at 9:32 AM

Re: Getting a Complete List of Timezones from Java
nice article
Posted by bala on May 18, 2010 at 2:50 AM

Re: Getting a Complete List of Timezones from Java
@bala - thanks! :)
Posted by dougboude on May 18, 2010 at 10:14 AM

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