GNU bug report logs - #57803
28.2; decoded-time-add results in message "obsolete timestamp with cdr 1"

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Gustavo Barros <gusbrs.2016 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.2; decoded-time-add results in message "obsolete timestamp with
 cdr 1"
Date: Wed, 14 Sep 2022 10:42:18 -0300

Hi All,

I'm trying to get some dates subtracted of date parts (months) and using 
`decoded-time-add', `decode-time', and `make-decoded-time', following 
the Elisp manual for the purpose.

In the manual "Time Conversion" section we find the following example 
for the `decoded-time-add' function (I just added the required library):

   (require 'time-date)
   (let ((time (decode-time nil nil t))
         (delta (make-decoded-time :month 2)))
     (encode-time (decoded-time-add time delta)))

Evaluating this, we get the message:

   obsolete timestamp with cdr 1 [2 times]

Being less strict in the decoded time format:

   (let ((time (decode-time))
         (delta (make-decoded-time :month 2)))
     (encode-time (decoded-time-add time delta)))

We get:

   obsolete timestamp with cdr 1 [10 times]

(This was evaluated on an "emacs -Q" session).

I'm not sure if this is a documentation problem, and I just failed to 
find a way to satisfy `decoded-time-add', or if there is an actual 
underlying issue.  I think the latter is the case though.  As we see 
from the above examples, we can reduce the number of issued messages by 
specifying the FORM argument to `decode-time' so that it returns the 
seconds in (TICKS . HZ) form.  I'm somewhat surprised that 
`decoded-time-add' is so picky as to not accept the default return value 
from `decode-time', but I don't know these functions enough to make much 
of a stance about this.  Besides, though I may be missing something, I 
could not find a way to specify (TICKS . HZ) form to 
`make-decoded-time', so that `decoded-time-add' still complains even if 
we use `(decode-time nil nil t)'.

A little side report of what is likely just a typo in the manual.  The 
following example in the same section of the manual for the 
`decode-time' function:

   (setf (decoded-time-year decoded-time)
	  (+ (decoded-time-year decoded-time) 4))

results in:

   let*: Symbol’s value as variable is void: decoded-time


Best regards,
Gustavo.



In GNU Emacs 28.2 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.20, 
cairo version 1.16.0)
of 2022-09-12 built on gusbrs-laptop
Windowing system distributor 'The X.Org Foundation', version 
11.0.12013000
System Description: Linux Mint 20.3

Configured using:
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 value of $LANG: en_US.UTF-8
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Major mode: Lisp Interaction

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Memory information:
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Message #8 received at 57803 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Gustavo Barros <gusbrs.2016 <at> gmail.com>
Cc: 57803 <at> debbugs.gnu.org
Subject: Re: bug#57803: 28.2; decoded-time-add results in message "obsolete
 timestamp with cdr 1"
Date: Wed, 14 Sep 2022 16:46:50 +0200

Gustavo Barros <gusbrs.2016 <at> gmail.com> writes:

> Evaluating this, we get the message:
>
>    obsolete timestamp with cdr 1 [2 times]

I can reproduce this in emacs-28.2, but not in Emacs 29, so I think this
has been fixed for the next release.

> A little side report of what is likely just a typo in the manual.  The
> following example in the same section of the manual for the
> `decode-time' function:
>
>    (setf (decoded-time-year decoded-time)
> 	  (+ (decoded-time-year decoded-time) 4))
>
> results in:
>
>    let*: Symbol’s value as variable is void: decoded-time

Well, you have to set the variable `decoded-time' to something first.

Message #13 received at 57803 <at> debbugs.gnu.org (full text, mbox):

From: Gustavo Barros <gusbrs.2016 <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 57803 <at> debbugs.gnu.org
Subject: Re: bug#57803: 28.2; decoded-time-add results in message "obsolete
 timestamp with cdr 1"
Date: Wed, 14 Sep 2022 11:58:26 -0300

Hi Lars,

On Wed, 14 Sep 2022 at 16:46, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:

> I can reproduce this in emacs-28.2, but not in Emacs 29, so I think 
> this
> has been fixed for the next release.

Thank you for looking into this, and even better it is already fixed.

> Well, you have to set the variable `decoded-time' to something first.

Oops, my bad. Understood.

Best regards,
Gustavo.

Message #20 received at 57803 <at> debbugs.gnu.org (full text, mbox):

From: Łukasz Stelmach <stlman <at> poczta.fm>
To: 57803 <at> debbugs.gnu.org
Subject: obsolete timestamp with cdr 1
Date: Thu, 27 Oct 2022 21:46:45 +0200

[Message part 1 (text/plain, inline)]

Hi,

For the record. On Emacs 27.1 this happens when evaluating the following
expression:

    (time-add '(0 . 1) 1)

-- 
Miłego dnia,
Łukasz Stelmach

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