AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
Elsewhere on timeanddate.com
Eid al-Fitr
Eid al-Fitr is a holiday to mark the end of the Islamic month of Ramadan, during which Muslims fast during the hours of daylight.
May Day
Labor Day, International Workers' Day, and May Day, is a day off for workers in many countries around the world.
Daylight Saving Time (DST)
Why do many countries set the clocks back and forth an hour twice a year?