Subject: Re: Lisp Date arithmetic library
From: Erik Naggum <>
Date: Wed, 26 Jun 2002 12:35:32 GMT
Newsgroups: comp.lang.lisp
Message-ID: <>

* Erik Naggum
> If you need to compute with days, remember that (floor <universal-time>
> 86400) always decomposes into a day since 1900-01-01 and the seconds the
> start of the current day.

* Raymond Wiker
| Except for leap seconds, no?

  Do you think I would lie about this or withhold essential facts or make a
  claim that would be true "most of the time"?  "There are exactly 86400
  seconds in a day, all year round" was phrased that way in order to avoid
  mention of the leap-second mess, but it should _still_ be crystal clear.

| (Or is that not an issue with <universal-time>?)

  I think you should look this up and not believe me.  This comes up again and
  again because some people have heard of leap seconds and get all confused,
  and unless they do some work to figure it out, they just keep asking.
  Guide to non-spammers: If you want to send me a business proposal, please be
  specific and do not put "business proposal" in the Subject header.  If it is
  urgent, do not use the word "urgent".  If you need an immediate answer, give
  me a reason, do not shout "for your immediate attention".  Thank you.