Hi,
Regretfully, there is no way to change the formatting system globally now [1].
On the other hand, it can be relatively easy to add the formatting control to Krusader itself [2, 3]. You can
1. Edit the source code (just add the format you need directly into the listmodel.cpp), recompile, install, and use it right now (that is very easy and instructive [4], just ask this list if you need some additional instructions).
For example, replace line 528 in listmodel.cpp
return QLocale().toString(dateTime, QLocale::ShortFormat);
with
return QLocale().toString(dateTime, "yyyy-MM-ddTHH:mm:ss");
Format data can be stolen from [5].
2. Implement an option for this on the "Panel" page of Konfigurator and send a review request through Phabricator [6]. Not that easy but manageable for anybody with very basic programming skills. Everybody with the same problem will be grateful to you.
3. Wait for someone to implement this feature. Easy but boring. ;)
Hope this helps.
Best regards,
Yuri