AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
Elsewhere on timeanddate.com
Idul Adha
Eid al-Adha (Id ul-Adha) is an Islamic festival falling on the 10th day of the month of Dhul Hijja (Thou al-Hijja) to commemorate the willingness of Ibrahim (Abraham) to sacrifice his son.
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?