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Hi,
I'm finding it very hard to manipulate dates.
What I want:
Example input: "2021-01-20"
Corresponding expected output: "20 Jan 2021"
What I tried:
(format-time-string "%d %b %Y" (iso8601-parse "2021-01-20"))
⇒ invalid time specification
(format-time-string "%d %b %Y" (iso8601-parse "2021-01-20T00:00:00"))
⇒ "01 Jan 1970" ;; note the wrong year
What works:
(format-time-string
"%d %b %Y"
(encode-time (iso8601-parse "2021-01-20T00:00:00")))
⇒ "20 Jan 2021"
I found the Elisp manual confusing with all the date formats, all the
functions and their different kinds of arguments.
Possible improvements:
- make format-time-string accept as 2nd argument the return value of
(iso8601-parse "2021-01-20T00:00:00") with a correct year
- make format-time-string accept as 2nd argument the return value of
(iso8601-parse "2021-01-20") without sending an "invalid time
specification"
- restructure the manual to start with a page describing the different
time formats used throughout Emacs with a table listing all conversion
functions, the kind of input they take and the kind of output they
generate and examples for each.
In GNU Emacs 27.1.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.21, cairo version 1.16.0) Windowing system distributor 'Fedora
Project', version 11.0.12010000 System Description: Fedora 33
(Workstation Edition)
Best,
--
Damien Cassou
"Success is the ability to go from one failure to another without
losing enthusiasm." --Winston Churchill
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