[tz] Hong Kong time 1941

Phake Nick c933103 at gmail.com
Fri Oct 26 15:38:28 UTC 2018

Also, the Liberation day of Hong Kong after WWII which British rule over
the territory resumed was August 30, 1945, which I think should be the
termination date for the use of JST in the territory, instead if the day
currently stated in the tz database.

在 2018年10月26日週五 23:16,Phake Nick <c933103 at gmail.com> 寫道:

> Additional online electronic records I found:
> 1941 June 14, Hong Kong Daily Press, Daylight Saving from 3am Tomorrow:
> https://i.imgur.com/05KkvtC.png
> 1941 September 30, Hong Kong Daily Press, Winter Time Warning:
> https://i.imgur.com/dge4kFJ.png
> Phake Nick <c933103 at gmail.com> 於 2018年10月26日週五 下午10:34寫道:
>> Today I went to check microfilm records stored at Hong Kong Public
>> Library and found following situation that are inconsistent with tz
>> database record.
>> * Around April 1 1941, there're no news about DST on various newspapers
>> that I checked. Time given for sunrise/sunset around the period are also
>> continuous (as in they're minutes within each others on those days,
>> indicating there are no change to time standard around 1941 April 1.
>> * I have subsequently checked Hong Kong Observatory's site and the site
>> now list the 1941 DST start date for Hong Kong as June 15. (url is same as
>> the one in tz file but content is different from when the 2009 comment was
>> made) I have not tried validating the info from those newspapers as I
>> wasn't aware of the table's current content until I stopped using the
>> library.
>> * And then, on September 30 1941, according to Ta Kung Pao (Hong Kong
>> edition), it was stated that fallback would occur on the next day (the
>> 1st)'s "03:00 am (Hong Kong Time 04:00 am)" and the clock will fall back
>> for a half hour. (03:00 probably refer to the time commonly used in
>> mainland China at the time given the paper's background), after it was
>> spring forward for an hour months ago. I cannot find out record of English
>> newspaper from that day, but the sunrise/sunset time given by South China
>> Morning Post for October 1st was indeed moved by half an hour compares to
>> before.
>> * After that, in December, the battle to capture Hong Kong started and
>> the library doesn't seems to have any record stored about press during that
>> period of time. Some media resumed publication soon after that within the
>> same month, but there were not much information about time there. Later
>> they started including a radio program guide when they restored radio
>> service, explicitly mentioning it use Tokyo standard time, and later added
>> a note saying it's half an hour ahead of the old Hong Kong standard time,
>> and it also seems to indicate that Hong Kong was not using GMT+8 when it
>> was captured by Japan.
>> * Image of related sections on newspaper:
>> 1941 September 30, Ta Kung Pao (Hing Kong) , "Winter Time starr
>> tomorrow": https://i.imgur.com/6waY51Z.jpg  (Chinese)
>> 1941 September 29, South China Morning Post, Information on
>> sunrise/sunset time and other things for September 30 and October 1:
>> https://i.imgur.com/kCiUR78.jpg
>> 1942 February 5, The Hong Kong News, Radio Program Guide:
>> https://i.imgur.com/eVvDMzS.jpg
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