[tz] Irish Standard Time vs Irish Summer Time

[Paul Eggert]

On 12/08/2017 12:12 PM, Michael Deckers via tz wrote:
>
>   Allowing negative AT values would
>   provide a "convenient notation" to avoid the
>   Chatham Rules, as in
>
>   Rule  NZ  2008  max  -  Apr  Sun>=1  -10:00u 0  S

Good point. I hadn't thought of that. We should make that change in a 
year or two, after the zic.8 documentation change has had time to percolate.

>
>> zic.8 ought to be patched to make explicit that AT and SAVE have no
>> small range limits.
>
>   Yes, and it may also be necessary to state the meaning
>   of such extensions; for instance, the suffixes u, g, z
>   currently are allowed for SAVE values but they
>   cannot really be used because it is not clear what
>   they are supposed to mean in this context. 

Sorry, I don't see a problem here. The u suffix means "treat the date 
and time as UTC". If the time is -02:00, that means 22:00 the previous 
day UTC.

I installed the attached patch to zic.8 to try to document the 
longstanding zic interpretation better.
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