AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
Elsewhere on timeanddate.com
New Year
New Year’s Day is the first day of the year, or January 1, in the Gregorian calendar.
Orthodox Christmas Day
Many Orthodox churches annually celebrate Christmas Day on or around January 7. This event commemorates the story of Jesus Christ’s birth, according to the Christian Bible.
Daylight Saving Time (DST)
Why do many countries set the clocks back and forth an hour twice a year?