AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
Elsewhere on timeanddate.com
Anniversary of the Birthday of the Sovereign
The Queen's birthday, also known as the Queen's Official Birthday, is celebrated in many Commonwealth countries around the world. It is a public holiday in countries such as Australia, New Zealand, and Gibraltar, although on different dates.
Daylight Saving Time (DST)
Why do many countries set the clocks back and forth an hour twice a year?
About the 12 Months
Why are there 12 months? How long are they, and what do the month names mean?