yes, the flash Date object provides all the necessary properties to
calculate the time for different time zones, but it still wont be accurate
if the user's clock is off.
for more accuracy, youll need to have the time from the server. this should
be simple to do with any server side language. in php, you can use the
date('U') function or the time() function, which will both give you the Unix
timestamp - the number of seconds that have passed since 12am January 1,
1970. you can pass that into your swf using flashvars. you can then create a
Date object based off of that value. just note that (in php, at least) the
value is seconds, and the flash Date object uses milliseconds. oh, and load
time of your swf may cause that to be off a little. if thats a problem, you
could store it in a javascript Date object, and then grab the value when
youre ready for it.
On 9/6/07, Marcelo Volmaro <[EMAIL PROTECTED]> wrote:
>
> I took that data from various sources. I'm using that for my own clock
> too, and also have a function that, taking a "position" (first, second,
> third, etc), a month and "day" can calculate the real date when a DST
> occurs (for example, you feed "first Friday of may" or "last Monday of
> December" and it returns the correct date for a specific year).
>
> I have a list of DST/Timezones per location, but did not converted to AS
> (I have some XML files). The problem is that the list is a big one,
> because the list is compromised of:
> a) Countries
> b) Regions
> c) States
> d) Cities.
>
> Usually, you can trim down the list a lot, since almost all cities in a
> country have the same TZ/DST, but that's not the case for the US. In fact,
> you have some cities on the same state that have different TZ.
>
> You can get the complete list from:
>
> http://www.isi.edu/~pan/SWBP/time-zone-note/time-zone-note.html
>
> The problem with that list is that the dates specified for the start/end
> of DST is that are tied to a specific year and usually you need to wait
> until someone updates that list... so I coded the following list that has
> all the info necessary to do the calcs:
>
> private static const dstPolicies:Object = {
> USADLS:new DstPolicy(1,0,4, -1,0,10),
> EUDLS:new DstPolicy(-1,0,3, -1,0,10),
> AU2003DLS:new DstPolicy(-1,0,10, -1,0,3),
> AUTDLS:new DstPolicy(1,1,10, -1,0,3),
> RUDLS:new DstPolicy(-1,0,3, -1,0,10),
> EGDLS:new DstPolicy(-1,5,4, -1,4,9),
> IRDLS:new DstPolicy(-1,6,3, -1,1,9),
> IQDLS:new DstPolicy(255, 1,4, 255, 1,10),
> ILDLS:new DstPolicy(-1,4,3, 1,4,10),
> JODLS:new DstPolicy(-1,3,3, -1,4,10),
> NADLS:new DstPolicy(1,0,9, 1,0,4),
> PKDLS:new DstPolicy(1,6,4, 1,6,10),
> SYDLS:new DstPolicy(255,30,3, 255,21,9),
> CLDLS:new DstPolicy(2,0,10, 2,0,3),
> CLEDLS:new DstPolicy(2,5,10, 2,6,3),
> NZDLS:new DstPolicy(1,0,10, 3,0,3),
> PYDLS:new DstPolicy(1,0,9, 1,0,4),
> FKDLS:new DstPolicy(1,0,9, -1,0,4)
> };
>
> Where the first number is the position (1: first, -1:last, 255: straight
> date), the second and the third are the day/month.
> If the position is 255, the date is a straight day/month date, so for
> example for IRAQ the start date is April 1.
>
> The formulas for the calcs are:
>
> /**
> * @param y:int Year
> * @param m:int Month (0 - 11)
> * @param n:int Day of the week (0 for a Sunday, 1 for a
> Monday, 2 for a
> Tuesday, etc)
> * @param w:int Occurence (1:first, 2:second, 3:third,
> 4:fourth, -1:last)
> * @return real day of the month where the DST starts/ends
> *
> * first friday = w:1, n:5
> * third monday = w:3, n:1
> * last monday = w:-1, n:1
> */
>
> private static function calcStartEnd(y:int, m:int, n:int,
> w:int):int{
> if (w < 0){
> var nd:Number = (new Date(y, m,
> 0)).getDate();
> var diff:Number = (getDayOfWeek(y, m+1,
> nd) - n) % 7;
> if (diff < 0) diff += 7;
> return nd-diff;
> }
>
> var nq:int = 7 * w - 6 + (n - getDayOfWeek(y, m+1,
> 1)) % 7;
> if (nq < 1) nq += 7;
>
> return nq;
> }
>
> /**
> * @param y:int Year
> * @param m:int Month (1 - 12)
> * @param d:int Day (1 - 31)
> * @return 0 for a Sunday, 1 for a Monday, 2 for a
> Tuesday, etc.
> */
>
> private static function getDayOfWeek(y:int, m:int,
> d:int):int{
> var a:int = int((14 - m) / 12);
> y -= a;
> m += 12 * a - 2;
> var r:int = (d + y + int(y/4) - int(y/100) +
> int(y/400)
> + int((31*m)/12))%7;
> if (r < 0) {
> return 7+r;
>
> } else {
> return r;
> }
> }
>
>
>
> Hope it helps...
>
>
> On Thu, 06 Sep 2007 13:03:13 -0300, Keith Reinfeld
> <[EMAIL PROTECTED]> wrote:
>
> > Hi Corban,
> >
> > Yes, I've been working on mine. I really want to thank Marcelo for the
> > timezones array. Very helpful! Where did that come from?
> >
> > I have worked out a mechanism for applying Daylight Savings Time rules.
> > Now
> > all I need is the data, by location, to pass in.
> >
> > Note to Jim Berkey: First, thank you for the link. Nice touch with the
> > iconic location graphics. Second, I'm getting a 404 for the worldclock
> > source file. Just FYI.
> >
> > Regards,
> >
> > -Keith
> > http://keithreinfeld.home.comcast.net
> >
> >
> > _______________________________________________
> > [email protected]
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> >
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>
>
>
> --
> Marcelo Volmaro
> _______________________________________________
> [email protected]
> To change your subscription options or search the archive:
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>
> Brought to you by Fig Leaf Software
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> http://www.figleaf.com
> http://training.figleaf.com
>
--
John Van Horn
[EMAIL PROTECTED]
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