# Lesson 18 — Activity 1: From Standard to 24-Hour Time

## From Standard to 24-Hour Time

#### A standard clock is divided into 12 hours. If you start at midnight, the first time around the clock is called a.m., which means ante meridiem. This is Latin for "before noon." And the second time around the clock we call p.m., which means post meridiem, which is Latin for "pre-midnight." Sometimes this can get confusing.

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#### If you are talking to someone you don't know very well and they say they will meet you at 8, do they mean 8 a.m. or 8 p.m.?

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#### So how does this work?  Start at midnight. Midnight is 0000 hours, 1 a.m. is 0100 hours — say this as zero one hundred hours; noon is 1200 hours and after that, we just start to add on until we get to midnight again. Midnight can also be called 2400 hours, 1 p.m. is 1300 hours; 2 p.m. is 1400 hours and so on. Does this sound a bit confusing to you? It shouldn't. With a little practise, it is very easy and eliminates ANY confusion! With a 24-hour clock, there is no way that you can get mixed up between 8 a.m. and 8 p.m.  8 a.m. is 0800 hours and 8 p.m. is 2000 hours. One of the biggest advantages to using the 24-hour clock is that it helps avoid mistakenly setting digital or analog alarm clocks for the p.m. instead of the a.m. hour or vice versa. Another benefit of the 24-hour clock is in helping you figure out how long until something occurs.

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