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[SOLVED] Re: How to subtract timestamp in elisp?
From: |
stardiviner |
Subject: |
[SOLVED] Re: How to subtract timestamp in elisp? |
Date: |
Sun, 05 Jul 2020 11:04:16 +0800 |
User-agent: |
mu4e 1.4; emacs 28.0.50 |
Dmitry Alexandrov <dag@gnui.org> writes:
> 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.)
>
Dmitry:
This is really great. I thought to use `split-string` too to parse timestamp. My
thought was to use existing API if exist when I compose this email. But
implement a function to dealing with this is great too. Thanks for your help.
And of course Eli and Michael too.
> 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.
I used to realized my email always go into Gmail junk, can't find out the
reason. I guess you just solved my long time issue. I'm using Emacs mu4e
package. I will Google how to use SMTP server in mu4e. Thanks again.
--
[ stardiviner ]
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