First Week Of Year file-format - %Y-%V - shows correct week no (1), but wrong year (2024) for 2.1.2025

[triplem]

Describe the bug
If a new file is created in the first week of a new year (well, at least for 2025), the file-fomat shows the correct week-no, which is no. 1, but still uses the "old" year, meaning the year on the beginning of the week.

To Reproduce
Create a weekly journal with the following settings:

(setq org-journal-file-type 'weekly)
(setq org-journal-start-on-weekday calendar-week-start-day)
(setq org-journal-file-format "%Y-%V.org")

This will create a new file with the name 2024-01.org on 2.1.2025.

Expected behavior
The first week of the year should be in the correct year, meaning 2025 in this case.

[drewbenn]

Short answer: use %G instead of %Y, but also update (org-journal--format-rx-alist) to support %G. Though now that you've made it through the beginning of 2026, this shouldn't be a problem again until 2030!

---

So as you know, org-journal picks a filename based on the day at the beginning of the week. When it moved backward to Monday, December 30 and queried that day's year and that day's ISO week, there was a mismatch. If it had queried that day's ISO year, on the other hand, the result would have been in sync with the ISO week.

• Change your file format setting to "%G-%V" so it will use the ISO week for both year and week.

But if you just use %G then a different lookup will fail while trying to create the CREATED property (giving you an error like, org-fold-region: Calling 'org-fold-core-region' with missing SPEC). That's why there is a comment in the code listing only a few supported date fields, even though the emacs function being used ((format-time-string)) supports many more. Updating the lookup table to add support for %G will create the new file properly.

• In (org-journal--format-rx-alist) change the "%Y" to "%[YG]"

I tested all this by picking a date in January where the ISO week started (Monday) in December: 2020-01-01. Then created an entry for that date, using each of 3 different org-journal-file-format values:

(setq org-journal-file-format "%Y%m%d") ;default
(setq org-journal-file-format "%Y-%V") ;per bug
(setq org-journal-file-format "%G-%V") ;what I think it should be

then use:

• M-x org-journal-new-date-entry Enter [2020-01-01]

and see what filename you get:

Use	Get
%Y%m%d	20191230
%Y-%V	2019-01
%G-%V	2020-01