From: Dmitry Alexandrov <dag@gnui.org>
To: numbchild@gmail.com
Cc: Emacs Help <help-gnu-emacs@gnu.org>
Subject: Re: How to subtract timestamp in elisp?
Date: Sun, 05 Jul 2020 00:11:25 +0300 [thread overview]
Message-ID: <zh8f6l4y.dag@gnui.org> (raw)
In-Reply-To: <87zh8fwn4u.fsf@gmail.com> (stardiviner's message of "Sat, 04 Jul 2020 19:11:29 +0800")
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stardiviner <numbchild@gmail.com> wrote:
> I hope a function can subtract two timestamps:
>
> 00:12:35 - 00:10:45 = 00:01:50
>
> Is there some hints or suggestion like function name or Emacs library or package?
> Or Linux command is acceptable. I can write a function to execute shell command then parse the result.
OMG! Since when that started to require anything but arithmetics?
(defun timestamp-interval (a b)
(cl-flet* ((hms->s (h m s) (+ (* 3600 h)
(* 60 m)
s))
(s->hms (s) (let* ((h (/ s 3600))
(s (% s 3600))
(m (/ s 60))
(s (% s 60)))
(list h m s)))
(timestamp->s (string) (apply #'hms->s
(mapcar #'string-to-number
(split-string string ":"))))
(s->timestamp (s) (apply #'format "%s%02d:%02d:%02d"
(if (> 0 s) "-" "") (s->hms (abs s)))))
(s->timestamp (- (timestamp->s a) (timestamp->s b)))))
(timestamp-interval "00:12:35" "00:10:45")
;; => "00:01:50"
(Not tested.)
P. S. Sending mail ‘From: …@gmail.com’ right from your home machine is a best way to send it straight to junk folder. ;-) Use smtp.gmail.com.
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next prev parent reply other threads:[~2020-07-04 21:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-04 11:11 How to subtract timestamp in elisp? stardiviner
2020-07-04 11:39 ` Eli Zaretskii
2020-07-04 12:54 ` Michael Heerdegen
2020-07-04 21:17 ` Dmitry Alexandrov
2020-07-04 21:11 ` Dmitry Alexandrov [this message]
2020-07-05 3:04 ` [SOLVED] " stardiviner
2020-07-06 2:48 ` mu4e: configuring SMTP (was: [SOLVED] Re: How to subtract timestamp in elisp?) Dmitry Alexandrov
2020-07-05 13:30 ` How to subtract timestamp in elisp? Emanuel Berg via Users list for the GNU Emacs text editor
2020-07-06 1:43 ` stardiviner
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