just to add to the soup (since nonBrit info is already in) in Poland the usage of "half-till"; "5/10/20 past/to"; is also common. 15min duration or quarter of an hour has its own word:
kwadrans, so its:
k. till or past an hour in case of h:45 or h:15. A duration of 45 min 'd be described as 3
k just like you 'd say half an hour in case of a 30min duration.
in case of h:25 or h:35 the expressions "five before/after half-till" could be used.
All this applied to a 12h based clock reading (so
never half-till 23 in case of 22:30)
As far as dates are concerned it's always DMY. In my 1st schoolyears it was even common to note the month in Roman numerals. (I should check if that changed)
P.S. I always hated english 12h notations notoriously mixing up am and pm.
I still wonder why there are clocks on the island instead of sundials simply marked "before teatime/teatime/after teatime"
