I grew up in Britain with "five-and-twenty past six" (never "after six") and "five-and-twenty to seven" etc. But in latter years the "five-and-twenty" became "twenty-five".
For quite a long time now I have lived in Continental Europe and the 24-hour clock is now my norm. I learnt my lesson early in Switzerland. I once ordered a taxi for 6pm "six heures du soir" and it arrived at 6am. When I complained, I was told that I ought to have asked for it at 18h "dix-huit heures". "Six heures" would always be interpreted as 06:00h.
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