[LEAPSECS] authoritative tz project info

[Brooks Harris]

On 2015-06-01 03:25 PM, Steve Allen wrote:
> On Mon 2015-06-01T12:05:08 -0700, Tom Van Baak hath writ:
>> Can you send me a definitive URL with global TZ rules so I can
>> grep|sort|uniq to get a feel for when DST transitions occurs?  I guess
>> I thought it always was 2 am local (which implies jumps from 02h->03h
>> and 02h->01h).
> I believe several Arab countries change at midnight.
> This is the one-stop shopping authoritative data
>
> https://www.iana.org/time-zones
>
> except that the IANA content is repackaged by various vendors inside
> of various toolkits for various platforms, so your system may not
> follow those rules.
>
>> Also, possibly related, do you know of any place where DST is +/- 2
>> hours instead of +/- 1 hour?  I ask because the still-in-development
>> PE (phase encoded) WWVB format appears to allow for such a (non US
>> legal) transition.  I can't quite tell if it's a bug or typo or spec.
> These are good questions for the tz mail list because the denizens
> there have memory of many of the crazy things that local officials
> have declared during the history of the tz project.

And there's the Windows timezones. They don't match tz database ....

The top of Windows registry hive holding the timezone information for 
each of the supported timezones. Note this data is dynamically updated 
with a "Windows Update". There's no authoritative information I've found 
on how Microsoft goes about accumulating and managing this information.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones

The Windows registry key holding the currently selected timezone information

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation

-Brooks
>
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