From: "Davis Herring" <herring@lanl.gov>
To: "Deniz Dogan" <deniz.a.m.dogan@gmail.com>
Cc: Emacs-Devel devel <emacs-devel@gnu.org>
Subject: Re: What do I use if not `float-time'?
Date: Wed, 6 Jan 2010 07:29:40 -0800 (PST) [thread overview]
Message-ID: <41805.130.55.118.19.1262791780.squirrel@webmail.lanl.gov> (raw)
In-Reply-To: <7b501d5c1001060715j6a9bf132y93d6c55d5af4c511@mail.gmail.com>
> Okay, so what do I use instead? I just want a "UNIX timestamp" as an
> integer or string. What's the idiomatic way to get that?
Use `current-time'. The trick is that you then have to deal with multiple
integers (because Emacs ints are (often) shorter than 32 bits).
`float-time' exists to avoid that inconvenience at the cost of another.
In practice, using the integer parts of calls to (float-time) should be
fine so long as you don't do too much arithmetic on them: doubles have 53
bits of mantissa, and so can represent any reasonable traditional
(integer) time stamp exactly.
To get a string version of the integer part (which you can't safely turn
into an integer!), you can just use (format-time-string "%s").
Davis
--
This product is sold by volume, not by mass. If it appears too dense or
too sparse, it is because mass-energy conversion has occurred during
shipping.
next prev parent reply other threads:[~2010-01-06 15:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-06 15:15 What do I use if not `float-time'? Deniz Dogan
2010-01-06 15:29 ` Davis Herring [this message]
2010-01-06 20:27 ` Juri Linkov
2010-01-07 1:08 ` Stephen J. Turnbull
2010-01-06 20:40 ` Deniz Dogan
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