Use of ISO 8601 date format for timestamp

[pabloab]

Right now (v41) with file name template Screencast_%d_%t we get something like Screencast_08-31-2023_04:07:24 AM.

Would be nice to have the possibility to use ISO 8601 format, something like Screencast_%Y-%m-%d_%T (Screencast_2023-08-31_04:24:32). Not sure why here %d is MM-DD-YYYY, but on date command is DD. Also, the MM-DD pattern: I'm using an English interface, but a latin regional setup:

This way all the files would be listed naturally by time of creation.

GNOME Shell 3.36.9, Ubuntu 20.04.6 LTS, x11.

[smithc14]

It would actually be super cool if the file name template took all the date format choices (or the ECMAScript date time format specifiers). There are a number of things that dislike filenames with colon in them so I would prefer to just use epoch time in seconds.