Since the symmetry of today’s date and time will never happen again unless we start using Unix code.
The word “twelve” is the largest number with a single-morpheme name in English. Etymology suggests that “twelve” (similar to “eleven“) arises from the Germanic compound twalif “two-leftover”, so a literal translation would yield “two remaining [after having ten taken]”. This compound meaning may have been transparent to speakers of Old English, but the modern form “twelve” is quite opaque. Only the remaining tw- hints thattwelve and two are related.
Last year our sister city Gloucester, England asked its citizens what were the 12 coolest buildings in their city and came up with a list. What would be on your list of 12 for our island?