[tz] Problem with historical Asia/Manila?

[Brian Inglis]

On 2017-03-02 02:34, Paul Goyette wrote:
> On Thu, 2 Mar 2017, Paul Eggert wrote:
> 
>> Paul Goyette wrote:
>>> According to the asia file, the Philippines jumped 24 hours on May 11, 1899,
>>> from -15:56:00 to +8:04:00 (they moved the international date line?)
>>>
>>> # Zone  NAME            GMTOFF  RULES   FORMAT  [UNTIL]
>>> Zone    Asia/Manila     -15:56:00 -     LMT     1844 Dec 31
>>>                         8:04:00 -       LMT     1899 May 11
>>>                         8:00    Phil    +08/+09 1942 May
>>
>> Yes, they moved the date line. But this occurred in 1844, not in
>> 1899. I think you misread the UNTIL column. zdump -i reports:
>>
>> TZ="Asia/Manila"
>> -    -    -1556    LMT
>> 1845-01-01    00    +0804    LMT
>> 1899-05-10    23:56    +08
>> ...
>>
>> so the big change occurred in 1844, and the four-minute change
>> occurred in 1899, which is what the table says.
> 
> Yes, as expected, I misinterpreted the data!  Thanks for clarifying!
> 
> (FWIW, zdump indeed shows the big jump going from 1844-12-30 23:59:59
> to 1845-01-01 00:00:00 completely skipping over Dec. 31st!)

Background - it was considered to be part of New Spain with Mexico:

https://en.wikipedia.org/wiki/International_Date_Line#Philippines

over 14Mm Manila-Acapulco compared to nearly 9Mm Veracruz-Seville.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada