am and pm

     You may be familiar with the terms "am and pm" as the name of a mini-mart, but the am and pm actually stand for something. A.M. stands for antemeridian, meaning before noon. So 8 am is 8 o'clock in the morning. P.M. stands for postmeridian, or after noon. So 8 pm is 8 o'clock in the evening.
     In the military, and in France, among other places, people are more used to telling time on a 24-hour clock--the kind used by some websites. Once you get used to it, you'll know that 17 o'clock is the same as 5 pm, or 5 o'clock in the evening ( just subtract 12 from any number greater than 12, and remember that it's after 12 noon ). So 23 o'clock is 11 pm..