Additional settings for displaying date/time/datetime formats
Whilst we have a setting for log format, there should also be a format for displaying dates, times and datetimes on screen. Humans prefer a more readable notation than YYYY-MM-DD hh:mm:ss.ffff plus there are times when you are just displaying the date, the time or both combined.
I will do it. I have few questions before I begin:
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I will add to configuration->settings->general tab->Internationalization (i18n) Time display format with these options: 24 hour format (HH:MM:SS) 12 hour format (HH:MM:SS AP/PM) Any other format?
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Add time separator ":" and "." too? Any other separator?
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grep says that date/time format is used only in reports.php and rrd.php. Should I expand it somewhere else?
Here are the current settings. So, we don't need new, but maybe as you say, something is missing.

I think all dates in the GUI should use those specification, unless the user has set their own. Many plugins today are just doing their own thing. The cacti.log will use the system setting of course. Though it might be possible to re-write it per the user setting, which might be interesting. It would have to 'detect' rather than trust the setting of course since an admin could change it at any time.
Some people, for the sake of space, like trimming off the year if it's the current year, or in general. Have to give that some thought.