When examining about this, it is said that many are November 1, 2008, but on the other hand, there are sites that are on October 31st. Which one is correct?
According to the mailing list archives, the mailing list received Satoshi's email at
Fri Oct 31 14:10:00 EDT 2008. However the mailing list is moderated so perhaps the email was not received by everyone until a day later on November 1st. The first response to the email was sent on November 2nd, so it may be that the email was not forwarded to the list for a day or so.
Archive.org say on dec 24 2008 : "Sat, 01 Nov 2008 16:16:33" [https://web.archive.org/web/20081224103053/https://email@example.com/msg09959.html]
And Tim May (Cypherpunk) say (about the mail list creation in 1992) : John Gilmore and Hugh Daniel hosted the mailing list. There was no moderation, no screening, no "censorship" (in the loose sense, not referring to government censorship, of which of course there was none.) The "no moderation" policy went along with "no leaders."