AM and PM Explained
How does the 12-hour clock system work? Is midnight 12 am or 12 pm?
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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?
UTC: Coordinated Universal Time
Coordinated Universal Time (UTC) is the basis for civil time today. This 24-hour time standard is kept using highly precise atomic clocks combined with the Earth's rotation.