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From: "Florian Lindner" <mailinglists@xgm.de>
To: emacs-orgmode@gnu.org
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Date: Wed, 28 Jul 2021 16:47:14 +0200
Subject: org-timer-start at specified time stamp
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Hello,

frequently, when taking notes at a meeting with org-timer active, I hap=
pened to forget to start the timer at the beginning of the meeting:

* Meeting
Start: <2021-07-30 Fri 15:37>

- 0:00:05 :: started the timer to late
- 0:00:18 :: want to set zero to the time above 15:37
- 0:00:34 :: how do so?

The documentation of org-timer-start says:

> Set the starting time for the relative timer to now.
> When called with prefix argument OFFSET, prompt the user for an offse=
t time,
> with the default taken from a timer stamp at point, if any.
> If OFFSET is a string or an integer, it is directly taken to be the o=
ffset
> without user interaction.

This is about a timer stamp, not a timestamp.  Of course, it's possible=
, but to get the offset, I need to compute the amount of time from time=
r start to meeting start.

> When called with a double prefix arg, all timer strings in the active=

> region will be shifted by a specific amount.  You will be prompted fo=
r
> the amount, with the default to make the first timer string in
> the region 0:00:00.

My proposal is to enhance C-u org-timer-start to also determine if it i=
s located at a timestamp and use that as zero time.

Furthermore C-u C-u org-timer-start also can accept a timestamp and shi=
ft the region as if the timer was started at that time.

All that requires to distinguish between a timestamp and a timestamp. F=
or the first part, it is possible, as the timestamp includes a date, fo=
r the second part it's more hairy, as 15:37 could be a shift by 15m and=
 37s or the timestamp of 15:37 (3:37 pm).

Alternatively, a new function can be introduced that manipulated the th=
e running timer accordingly.

What do you think about that proposal? I am happy to work on that mysel=
f, but probably need some assistance from you!

Best, Florian