An elderly lady asked me this morning when i left the paper shop what is 21.30. I quickly caught on she was looking at the opening hours of the chip shop next door 12.00-21.30. When did we start using the 24 hour clock generally or perhaps she was confused.?
The 24-hour notation is used in timetables and on most digital clocks, but 12-hour notation is still widely used in ordinary life. ... The BBC has been using 24-hour notation in its online radio and TV guides for many years, though ITV, Channel 4, and Channel 5 still maintain 12-hour notation.
Date and time notation in the United Kingdom - Wikipedia
The Clock
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