1. Why are there two types of times?
The 12 hour clock system (am and pm) can be confusing especially on timetables because the same numbers for times are used twice each day. The 24 hour clock system is often used at airports, railway stations etc.
Most countries are now using the 24 hour clock system.
2. How many countries have Daylight Saving?
Most industrialised countries have daylight saving, except China and Japan. The countries near the tropics and equator do not have daylight saving because the amount of daylight each day does not vary much with the time of year.
3. How is noon or midday written under the 24 hour clock?
Noon or midday is written as 1200.
Midnight is 0000.