Some people have used it for many many years. Most still use the 12 hour clock, although for some special applications they might use the 24 h version.
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12 hour clock but could say the time in a 24 hour clock Analogue describes construction, not hours. It can be either.
2 PM on the 24 hour clock is 14:00.
12 hour clock we use in our homes.24 hour clock is used in travelling places eg:airport,train station.
24-hour time notation is more compact and less ambiguous, since you don't need to add "A.M." or "P.M." to be specific about a time.
You have given just a starting point or an ending point. You have to give two values in order to calculate the interval. You must also be clear if you are using a 24 hour clock or a 12 hour clock.