From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: tuhs-bounces@minnie.tuhs.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from minnie.tuhs.org (minnie.tuhs.org [45.79.103.53]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id e8442b91 for ; Mon, 5 Nov 2018 04:14:32 +0000 (UTC) Received: by minnie.tuhs.org (Postfix, from userid 112) id E81C5A2211; Mon, 5 Nov 2018 14:14:30 +1000 (AEST) Received: from minnie.tuhs.org (localhost [127.0.0.1]) by minnie.tuhs.org (Postfix) with ESMTP id 54B68A21EC; Mon, 5 Nov 2018 14:13:53 +1000 (AEST) Received: by minnie.tuhs.org (Postfix, from userid 112) id 460AEA2154; Mon, 5 Nov 2018 13:16:42 +1000 (AEST) Received: from mail-oi1-f171.google.com (mail-oi1-f171.google.com [209.85.167.171]) by minnie.tuhs.org (Postfix) with ESMTPS id CB8E5A1FBC for ; Mon, 5 Nov 2018 13:16:36 +1000 (AEST) Received: by mail-oi1-f171.google.com with SMTP id 192-v6so5496557oii.6 for ; Sun, 04 Nov 2018 19:16:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=UdKzmm8hRstPgr0VE5OJ4N+XIaSOu1dyNyS6N2LMgt0=; b=VKKX8njD/JRKZL3LpC9x3tgUq86Y1QfmoGOBQ1z0kNOek2f/8R1IjwNvxu4uR5/tVB e2auguhmSTEDprXx1XoX6ritZXlnpd7CQEyAmzXYFUtb68NdzwFincrb/q+Mz17WQHdD Gf7cV1P4t6rvt2qjfUdKu38H2WJw3BSacRHLM4/vueU4uppTcbJc7XKLXXYRl59uYnsg 3jRt/sf4NiLHDs2kSc0VDZQO48zfaf+0FiW3OekUM70+IqBIBflfb3rSyyxfyfTynmGB UNY8bAO4M723A79bZydZ0paJ7wAyo6/gUgtgJ4BE3zsIz3XLEAzeGNrba8T8YH0XNAeR gOIg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=UdKzmm8hRstPgr0VE5OJ4N+XIaSOu1dyNyS6N2LMgt0=; b=CjZeTe0DYeEl+iuXIQ8/9kkBjTNWIeUllFsalBN3KUflIyaWhkE7u8vo6lQH+gPRKo bg26t4kfFJbL1DhijVZD2IEsbgDIQk1u5wG+t84VcPodNoRlxfTkg57THFU2/+mfsb8W livZNfrSfZ/qIYT73G4s3PFSaebxygd5EnFTPR7RSy7a3ckqr1eXb10JRBsXBgVECcg7 fwyHPPn1IMzFHp+cvX83YSKI09gTrUXk5IsWe/Z0LeWR0NYOrCkLsRkoDZo1KLK9LSsY RW+wueoOqifGeqYEl2vwF5sf1ZtH33GQUeErZ8xUygpW1n3frhAqrdfMKBw2AGdlbY87 lsyA== X-Gm-Message-State: AGRZ1gLFc56ccUmUdRwgl3ulK96RKpAj76uq8+9aYLNPaNXX025tQ6BU 3ScHhmNleATFI9x29ESqkOci6ZiFmygsefIwLfcI+Clf1X4= X-Google-Smtp-Source: AJdET5cn3NyRm6XqRGW3yx2jbZQFG8Z+mgUUxJWUnIydcjiiE7GaSdtrBMyADGw5S8Its8bu1dsmukVfDt1rmSg7FoY= X-Received: by 2002:aca:dd08:: with SMTP id u8-v6mr11305042oig.94.1541387795847; Sun, 04 Nov 2018 19:16:35 -0800 (PST) MIME-Version: 1.0 Received: by 2002:a9d:7306:0:0:0:0:0 with HTTP; Sun, 4 Nov 2018 19:16:35 -0800 (PST) In-Reply-To: <20181105004259.A0840156E40C@mail.bitblocks.com> References: <20181105004259.A0840156E40C@mail.bitblocks.com> Date: Sun, 4 Nov 2018 19:16:35 -0800 Message-ID: To: Bakul Shah Content-Type: text/plain; charset="UTF-8" Subject: Re: [TUHS] Unix half a billion seconds old in 1985 X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Ken Thompson via TUHS Reply-To: Ken Thompson Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" unix time was originally measured in ticks (60th of a second). alas, 2^32 only allows between 2 and 3 years. so, we ran for 2 years and ended up facing big problem in the 3rd. our solution was to read all files and all backup tapes and subtract one year from all dates and move the epoch up a year. we didnt mind since dectapes (our backup tapes) had to be rewritten to keep the bits from rotting. we did it again the next year and when disaster was facing us on the 4th year, we went to seconds. it shows how much we bet on the longevity of unix. On Sun, Nov 4, 2018 at 4:42 PM, Bakul Shah wrote: > On Sun, 04 Nov 2018 15:44:37 -0700 Warner Losh wrote: >> >> On Sun, Nov 4, 2018 at 2:35 PM Dave Horsfall wrote: >> >> > UNIX was half a billion (500000000) seconds old on Tue Nov 5 00:53:20 >> > 1985 GMT (measuring since the time(2) epoch). >> > -- Andy Tannenbaum >> > >> > Hmmm... According to my rough calculations, it hit a billion (US) seconds >> > around 2000. >> > >> >> It's over a billion and a half today: >> % date +%s >> 1541371441 > > Strictly speaking Unix wasn't born on Thu Jan 1 UTC 1970, right? > dmr says this in "The Evolution of the Unix Time-Sharing Sytem": > > Although it was not until well into 1970 that Brian > Kernighan suggested the name `Unix,' in a somewhat > treacherous pun on `Multics,' the operating system we know > today was born. > > I wonder if how many unix programmers were born on Thu Jan 1 > UTC 1970. Linus comes close.