From: Bruno Barbier <brubar.cs@gmail.com>
To: Tim Landscheidt <tim@tim-landscheidt.de>, help-gnu-emacs@gnu.org
Subject: Re: Counterpart to time-to-days?
Date: Wed, 29 May 2019 23:03:04 +0200 [thread overview]
Message-ID: <5ceee589.1c69fb81.2145e.33c3@mx.google.com> (raw)
In-Reply-To: <87imttmoym.fsf@passepartout.tim-landscheidt.de>
Hi,
Tim Landscheidt <tim@tim-landscheidt.de> writes:
> Hi,
>
...
> | ELISP> (format-time-string "%F" (current-time))
> | "2019-05-29"
> | ELISP> (format-time-string "%F" (days-to-time (time-to-days (current-time))))
> | "3988-05-29"
> | ELISP>
>
> So time-to-days seems to count the days from 0001-12-31bce,
> while days-to-time (without being explicit about it) seems
> to treat days as counting from epoch (1970-01-01).
>
> What is the intended counterpart to time-to-days?
Are you looking for `time-to-number-of-days` ?
(format-time-string "%F" (days-to-time (time-to-number-of-days (current-time))))
=> 2019-05-29
Bruno
> How is date arithmetic supposed to be done in Emacs Lisp?
>
> TIA,
> Tim
next prev parent reply other threads:[~2019-05-29 21:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 12:20 Counterpart to time-to-days? Tim Landscheidt
2019-05-29 21:03 ` Bruno Barbier [this message]
2019-05-30 13:52 ` Tim Landscheidt
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