[tz] 1948-1951 Asia/Tokyo DST information

Phake Nick c933103 at gmail.com
Sat Sep 8 15:23:19 UTC 2018

2018-09-08 22:13, Brian Inglis <Brian.Inglis at systematicsw.ab.ca>  wrote:

> On 2018-09-08 01:50, Phake Nick wrote:
> > 2018-09-08 15:36 "Paul Eggert" wrote:
> >> On 2018-09-08 01:17, Phake Nick wrote:
> >>> The law cited in the latest commit do say the DST en at 00:00 on the
> day
> >>> after the second Saturday in September, however the second line of the
> >>> law write that "the Second Saturday in September would have 25 hours
> in a
> >>> day".
> >> Those mean the same thing. Since DST ends at 00:00 the day after
> Saturday,
> >> the clock jumps back from 24:00 on Saturday to 23:00 on Saturday, and
> >> Saturday has 25 hours.
> > Not really. It would mean the Sunday's clock go to 24:59 before jumping
> to 00:00
> > on Sunday. The official time the DST end is "00:00am on the next day
> after the
> > second Saturday of September". So it isn't ending before the day change.
> Please show references to these clocks that indicate up to 25 hours at DST
> end
> and 23 hours at DST start.
> Cultural references to time adjustments like DST, leap seconds, and leap
> years,
> tell you very little about how clocks are expected to operate.
> The North American power industry refers to the 25th hour, which is the
> repeated
> third hour, as hour 2*, and military time usage runs from 0100Z to 2459Z to
> avoid midnight confusion, instead of 0000Z to 2359Z, but all use the same
> clocks.
> --
> Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
> This email may be disturbing to some readers as it contains
> too much technical detail. Reader discretion is advised.

I was made aware of the situation with the NICT interview that I posted in
the first message, with NICT being the official authority to maintain and
distribute the JST standard clock, and that in the article it's said that
DST end at 25h back then. I see there are some newspaper back then which
would have relevant information but I don't have any subscription that
would allow me to access old newspaper database back then to check the
words. Maybe we should just send a message to NICT and ask them about it to
be sure?

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