Yes, I realize that not all of the spaces are  . That is intentional, actually. Having no breaking spaces would mean that the dates can't be split at all. Having a non-breaking space between the two shortest elements leads to, when a table is too wide for a display, the date/time being split in a better-looking way.

It might be good to replace, say, at least the first two spaces in that first string with non-breaking spaces. Though, those are less important because they come at the front of the string where breaking is less likely anyway. I don't use that format so don't have any experience with how that format breaks in an ugly manner in tables displayed at PerlMonks, so my guesses there are less founded so I haven't touched that. But allowing the date/time to break into 2 pieces that are likely to be roughly the same length has proven beneficial when using the other format.

I don't know if the non-breaking space was intentionally included to keep the time zone information with the time.

"The   is useful in some cases." Yes, that particular   is useful.