[tz] Hong Kong time 1941

Phake Nick c933103 at gmail.com
Fri Oct 26 14:34:00 UTC 2018

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
* 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
* 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:
1942 February 5, The Hong Kong News, Radio Program Guide:
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