[tz] Fallback rules?

Paul Goyette paul at vps1.whooppee.com
Wed Nov 4 02:03:01 UTC 2015


On Wed, 4 Nov 2015, Alfie John wrote:

> On Wed, Nov 4, 2015, at 11:33 AM, Robert Elz wrote:
>> Oh, I forgot to say in the last reply, that you (always) work out which
>> rules apply from the Zone line, never from what is in the rules
>> themselves.
>
> Yep, that's what I was assuming.
>
>> For Australia/Brisbane we have (as you indicated...)
>>
>>   Zone Australia/Brisbane 10:12:08 -      LMT     1895
>>                           10:00   Aus     AE%sT   1971
>>                           10:00   AQ      AE%sT
>>
>> The last of those lines has no "UNTIL" value, hence does not end
>> (which is normal for a zone specification, time is not expected to
>> end anywhere I know of, or not anytime within the range of tzdata.)
>
> Awesome, thanks for that. So as Australia/Brisbane is still on AQ as
> you say, and AQ no longer has any rules active, I should go with GMTOFF
> = 10:00, meaning that Brisbane is currently equivalent as GMT+10 (i.e.
> has no DST).

It's not a question of "any rules active."  Rather it's a question of
whether there are additional transitions defined.  There are none, so
Australia/Brisbane stays on its current time indefinitely.


+------------------+--------------------------+-------------------------+
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
| (Retired)        | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com    |
| Kernel Developer | 0786 F758 55DE 53BA 7731 | pgoyette at netbsd.org  |
+------------------+--------------------------+-------------------------+


More information about the tz mailing list