Can current version change the date format?

Continuing the discussion from Year format on abbreviated post dates not clear:

I agree with this thread as in the UK, this reads to me as 13th February 2016:

Can the administrator change it so that dates are shown in the full locale of the current user, 13/02/2013? Or 13th Feb 2013?

Yes, admins can change that.

The previous post is linking to a deleted topic. The significant content of the post that was linked to is to first go to your Admin / Customize / Text page and search for 'YY

That will return the following list:

js.dates.tiny.date_year
MMM 'YY

js.dates.medium.date_year
MMM D, 'YY

js.dates.long_date_with_year
MMM D, 'YY LT

js.dates.long_date_with_year_without_time
MMM D, 'YY

js.dates.long_date_with_year_with_linebreak
MMM D, 'YY <br/>LT

Edit each of those entries to replace 'YY with YYYY to get the full year.

Thanks! Is there documentation on which date formatting library is used? It’d be helpful to know which format tags are available (and is what I was looking for here).