I would like to hack and modify a predefined date time format of KDE 5 on Debian 9.2.1 Stretch.
A predefined format can be selected from the list of predefined formats at Kickoff Launcher > Computer > System Settings > Personalization > Regional Settings > Formats.
(For the screen shot of the Formats settings dialog, see https://superuser.com/q/1162283 on the SuperUser site.)
The effect of the format appears on the Formats settings dialog itself, and also appears on the Date field of the Details view of the Dolphin File Manager of the KDE desktop, and also the Properties of any file on Dolphin.
Unfortunately, none of the predefined formats suits me. The date time format of
en_US ("United States - American English") is particularly terrible from my viewpoint. On the other hand, the short date time format of
en_SE ("Sweden - English") is ISO 8601, and is close to what I want. Nevertheless, even
en_SE does not completely satisfy me; especially its long format disappoints me.
This Formats settings dialog never lets you freely create custom formats. It only gives you a choice from predefined formats.
Thus, I would like to hack and modify a predefined format. Please let me know how.
/usr/share/i18n/locales contains format files. The file names are identical to the format names such as
fr_FR and so on. However, the KDE that came with Debian 9.2.1 does not care about the format files in
/usr/share/i18n/locales. Modification to these format files or even deletion of all of these files never affects the behavior of the KDE on Debian 9.2.1. This directory even lacks
en_SE, and nevertheless
en_SE appears in the Formats settings dialog.
I wonder if the predefined formats are hard-coded in KDE.
Note that Debian 9.0 Stretch was released on 2017-06-17. The versions of KDE components that came with Debian 9.2.1 follow:
plasmashell --version # plasmashell 5.8.6 kf5-config --version # Qt: 5.7.1 # KDE Frameworks: 5.28.0 # kf5-config: 1.0
TheEzekielProject claims in his post (https://www.linuxquestions.org/questions/linuxquestions-org-member-success-stories-23/guide-to-setting-custom-date-format-in-recent-versions-of-kde-4175595458-print/) that he managed to create a custom date time format by modifying a format file in the directory
/usr/share/i18n/locales. The systems he tested are Kali Linux 2016.2 rolling with KDE Plasma 5.8.2 and KDE Frameworks 5.27.0, and Kubuntu 16.10 with KDE Plasma 5.7.5 and KDE Frameworks 5.26.0. His systems are older than mine.
I tried his method. In a format file, under
LC_TIME, I changed
t_fmt_ampm, and executed
locale-gen, and so on. However, his method has turned out to have no effect on the KDE on Debian 9.2.1. Also a comment to his post complains that his method fails on Neon (plasma 5.10).
By the way, my question is not a duplicate of
questions/1162283/use-iso-time-and-date-format-in-kde-5 on the SuperUser site. The question 1162283 asked for ISO date time format, and it has been fulfilled by the answer by
Marco Lussetti, that is, by simply selecting
en_SE from the list of predefined formats. My question asks for a hack to go beyond predefined formats.