[tz] Hong Kong time 1941

Michael H Deckers michael.h.deckers at googlemail.com
Sun Nov 18 12:52:53 UTC 2018

    On 2018-11-18 02:05, Paul Eggert asked:

> How do we know that they switched at the same instant?

     Because Decree No 204 of 1904 for Macau says that the switch is
     done to keep Macau time equal to the time in "Cantão" (Guangdong).

> Although (unlike Hong Kong) for Macao we have a copy of the government 
> order (it's cited in tzdb), that order doesn't specify even the date 
> of transition, much less a time of day.

     Incorrect. The decree does give the date ("30 do corriente")
     for the switch and it is quite clear about the time of day
     of the switch: it states that the new offset applies since
     Oct 30, and for the full day of Oct 30. As the offset is
     increased, this implies that the switch happened at the
     instant when UT was 1904-10-29T16:00.

     Actually, the switch described in decree 204 is the one done
     in "Cantão", but it is obviously also intended to be applied
     in Macau.

     Michael Deckers.

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