datetime: Show time when date is between yesterday & tomorrow (PR #9802)

When showing formatted strings such as “today”, if the format includes time, then also include in the resulting output.

This will produce a string such as “today 7:31 AM”.

See: https://meta.discourse.org/t/date-should-show-the-time-instead-of-today-for-time-formats/151435

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JavaScript isn’t my strong suit, but this appears to achieve the desired outcome, bit rough around the edges.

Was just thinking, it may need a special-case for LLL as well, where it transforms into LT to get the time portion preserved?

Hmm, I think this may have actually been already fixed with the new LocalDateBuilder recently introduced.