* parsing time strings from properties
@ 2019-09-21 20:27 Matt Price
2019-09-22 2:54 ` Adam Porter
2019-09-22 10:10 ` Thomas Plass
0 siblings, 2 replies; 4+ messages in thread
From: Matt Price @ 2019-09-21 20:27 UTC (permalink / raw)
To: Org Mode
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I use a very simple property in my assignment descriptions to set the
assignment due date:
:DUE_AT: 2019-09-26
I then pass this to an API which expects a date parameter like
`2019-09-26T23:59:59-04:00`. Since I only work in one time zone, I can
just concat the property value with the additional text, though actually I
have to change the `-04:00` string twice a year. I'm wondering though how
hard it would be to get the current time zone -- or the time zone that the
course is taught in -- from emacs, and construct the string from that
value.
Basically, I want a simple date representation to be interpreted as "the
last possible moment on this date i nthe appropriate time zone". I have not
tried to use timestamps here, in part because I'm more comfortable dealing
with text than with the horrors of time representations in either lisp or
javascript. Alsoi, I find it very very fast to insert a text string, and
just a little bit slower and more of an interruption to add a timestamp. I
just wanted to ask how other people manage this kind of operation; maybe I
should make the effort to start using DEADLINE timestamps. I don't really
use them in my own time management so I'm not well-versed in how to manage
them.
In nay case, I as always appreciate all of your help.
Matt
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: parsing time strings from properties
2019-09-21 20:27 parsing time strings from properties Matt Price
@ 2019-09-22 2:54 ` Adam Porter
2019-09-22 10:10 ` Thomas Plass
1 sibling, 0 replies; 4+ messages in thread
From: Adam Porter @ 2019-09-22 2:54 UTC (permalink / raw)
To: emacs-orgmode
For parsing timestamps, you may find this helpful:
https://github.com/alphapapa/ts.el
See e.g. functions ts-parse-org and ts-parse-org-fill.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: parsing time strings from properties
2019-09-21 20:27 parsing time strings from properties Matt Price
2019-09-22 2:54 ` Adam Porter
@ 2019-09-22 10:10 ` Thomas Plass
2019-09-22 17:18 ` Matt Price
1 sibling, 1 reply; 4+ messages in thread
From: Thomas Plass @ 2019-09-22 10:10 UTC (permalink / raw)
To: Matt Price; +Cc: Org Mode
Hi,
Matt Price wrote at 16:27 on September 21, 2019:
:
: :DUE_AT: 2019-09-26
:
: ...
:
: I'm wondering though how hard
: it would be to get the current time zone -- or the time zone that the course is taught in -- from
: emacs, and construct the string from that value.
This'll return the offset suffix (if that's what you want) when
executed in your local time zone (presumably "-04:00"):
(defun Price/local-time-offset-from-iso-date (y-m-d)
(let* ((ymd (mapcar (lambda (s) (string-to-number s)) (split-string y-m-d "-")))
(offsecs (nth 8
(decode-time
(apply #'encode-time
(list 59 59 23 (nth 2 ymd) (nth 1 ymd) (nth 0 ymd)))))))
(format "%s%02d:%02d"
(if (> offsecs 0) "+" "-")
(/ offsecs 3600)
(% offsecs 3600))))
On Unix, this'll always work. On Windows, it works most of the time,
but may fail in the weeks around switches from and to daylight saving.
Thomas
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: parsing time strings from properties
2019-09-22 10:10 ` Thomas Plass
@ 2019-09-22 17:18 ` Matt Price
0 siblings, 0 replies; 4+ messages in thread
From: Matt Price @ 2019-09-22 17:18 UTC (permalink / raw)
To: Thomas Plass; +Cc: Org Mode
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many thanks to both of you. Yours was very interesting to read, Thomas, but
ts makes it quite a bit easier to write:
(defun o-l-date-to-timestamp (date)
"use ts.el date parse functions return an ISO-compatible
timestamp for transmission to Canvas via API. DATE is a string,
usually of the form `2019-09-26`, but optionally including a full time."
(ts-format "%Y-%m-%dT%H:%M:%S%:z" (ts-parse-fill 'end date )))
I'm quite looking forward to using dash, s, ts, kv, etc to simplify my
often very obtuse legacy code.
On Sun, Sep 22, 2019 at 6:10 AM Thomas Plass <thunk2@arcor.de> wrote:
> Hi,
>
> Matt Price wrote at 16:27 on September 21, 2019:
> :
> : :DUE_AT: 2019-09-26
> :
> : ...
> :
> : I'm wondering though how hard
> : it would be to get the current time zone -- or the time zone that the
> course is taught in -- from
> : emacs, and construct the string from that value.
>
> This'll return the offset suffix (if that's what you want) when
> executed in your local time zone (presumably "-04:00"):
>
> (defun Price/local-time-offset-from-iso-date (y-m-d)
> (let* ((ymd (mapcar (lambda (s) (string-to-number s)) (split-string
> y-m-d "-")))
> (offsecs (nth 8
> (decode-time
> (apply #'encode-time
> (list 59 59 23 (nth 2 ymd) (nth 1 ymd) (nth
> 0 ymd)))))))
> (format "%s%02d:%02d"
> (if (> offsecs 0) "+" "-")
> (/ offsecs 3600)
> (% offsecs 3600))))
>
> On Unix, this'll always work. On Windows, it works most of the time,
> but may fail in the weeks around switches from and to daylight saving.
>
> Thomas
>
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2019-09-21 20:27 parsing time strings from properties Matt Price
2019-09-22 2:54 ` Adam Porter
2019-09-22 10:10 ` Thomas Plass
2019-09-22 17:18 ` Matt Price
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