Home > OS News > Why is November 17, 1858 the base time for OpenVMS?Why is November 17, 1858 the base time for OpenVMS? Thom Holwerda 2020-01-07 OS News 5 CommentsWhy is Wednesday, November 17, 1858 the base time for OpenVMS (VAX VMS)?Interesting answer for sure.About The Author Thom HolwerdaFollow me on Twitter @thomholwerda 5 Comments 2020-01-08 3:00 am nnnnicOh this is sweeet <3 Log in to Reply 2020-01-08 4:47 am DrumhellarWow. What a wonderful article. Log in to Reply 2020-01-08 6:25 am Lennie“Note that the OpenVMS time display and manipulation routines allow for only 4 digits in the ‘YEAR’ field. We expect this to be corrected in a future release of OpenVMS sometime prior to 31-DEC-9999.”Ohh, I was worried for a moment. 😉 Log in to Reply 2020-01-08 12:04 pm flypigFascinating story, but those cycles intrigue me. Wikipedia says they’re the Indication, Solar and Lunar cycles, which explains why they have those periods, but it doesn’t tell us how the starting position of the cycles was chosen. Also in Wikipedia it gives a hint, saying that Scaliger “knew that 1 BC or 0 had the character 9 of the solar cycle, 1 of the lunar cycle, and 3 of the indiction cycle”. Can anyone enlighten me about where these numbers come from? Log in to Reply 2020-01-09 12:47 pm evertInteresting! Thanks for sharing 🙂 Log in to ReplyLeave a Reply Cancel replyYou must be logged in to post a comment.