To clarify, I think the official name of the hours is less important than *when* the transition occurred. The law says that the last day of DST had 25 hours instead of 24. The question is whether in practice what happened was that starting 0:00 on Saturday, did people wait 25 hours (until 01:00 on Sunday) and THEN set their clocks back 1 hour, or did they wait 24 hours (until 00:00 on Sunday), and then set the clock back to 23:00? Best, Paul On 9/18/18 2:00 AM, horonet@ml.nict.go.jp wrote:
Dear Sirs,
Thank you for your email dated September 12, 2018. We really appreciate your interest and comment. Unfortunately, we have no information on the official name of additional hours past the 12th o'clock midnight on the last DST day of Japan. If you ask NAOJ, you may be able to get more information.
NAOJ and NAOJ Ephemeris Computation Office's Websites: https://www.nao.ac.jp/en/ https://eco.mtk.nao.ac.jp/koyomi/index.html.en
Thank you for another question about DST in 2020. The government is considering future DST in Japan, but nothing has been decided yet.
Thank you for your understanding. We wish good luck to you.
Sincerely,
Japan Standard Time Group Space-Time standards Laboratory Applied Electromagnetic Research Institute National Institute of Information and Communications Technology http://www.nict.go.jp/
On 2018/09/12 2:00, Paul Eggert wrote:
One other thing. The Japanese government is considering adopting daylight saving time for the 2020 Tokyo Olympics. Will this issue about 25-hour (or 26-hour) days come up in 2020? For example, could there be a 26-hour day in September 2020 with times ranging from 00:00 to 26:00? If so, a *lot* of computers will have to be reprogrammed, as no software I'm aware of supports timestamps like that now.