The
24-hour clock enjoys broad everyday usage in most non-English speaking countries, at least when time is written or displayed. In some regions, for example where German, French and Romanian are spoken, the 24-hour clock is used today even when speaking casually, while in other countries the
12-hour clock is used more often in spoken form.
In most English-speaking regions, particularly the
United States and the
Commonwealth, the 12-hour clock is the predominant form of stating the time with the 24-hour clock used in contexts where unambiguity and accurate timekeeping are important, such as for public transport schedules. Nonetheless, usage is inconsistent: in the UK, train timetables will typically use 24-hour time, but road signs indicating time restrictions (e.g. on
bus lanes) typically use 12-hour time.
Most people in "24-hour countries" are so used to both systems that they have no problem switching between the two, perceiving "three o'clock" and "15:00" simply as synonyms.[
citation needed] When speaking, a person may often pronounce time in 12-hour notation, even when reading a 24-hour display. It is also common that a person uses the 24-hour clock in
spoken language when referring to an exact point in time ("The train leaves at fourteen forty-five …"), while using some variant of the 12-hour notation to refer vaguely to a time ("… so I will be back tonight some time after five.").
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