On Monday, 29 October 2018 at 10:19:43 -0400, Clem Cole wrote: > On Mon, Oct 29, 2018 at 4:01 AM Michael Kjörling > wrote: > >> So 1969-10-30 05:30 UTC? > > I >>think<< it is more likely 06:30 UTC, as IIRC Daylight Saving Time > finished mid-month so I think it would have been UTC+8:00 [not +7:00 which > it would be now]. Yes, correct: $ TZ=America/Los_Angeles date -j 196910292230 +%s 5419800 $ TZ=UTC date -r -5419800 Thu 30 Oct 1969 06:30:00 UTC > If you want to be be 100% accurate and use UTC, then you would need to > check a precise calendar that had all those details to see how the US had > its clocks set on October 30, 1969. The good news was the transmission > stayed with the same time zone, which as I said was Pacific (UCLA is in Los > Angeles area and SRI in the Bay Area - but both are California - which > follows US, DST rules). The question is what were the rules that were in > effect that night. That's in the time zone sources: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule US 1967 2006 - Oct lastSun 2:00 0 S Rule US 2007 max - Nov Sun>=1 2:00 0 S So in 1969, DST ended on 26 October. Greg Of course, this didn't happen at *exactly* 22:30/6:30, but presumably nobody at the time thought that people would still be talking about it 50 years later. Greg -- Sent from my desktop computer. Finger grog@lemis.com for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA