Articles About Dates (16)
About the 7 Days
Why are there 7 days? How were the days named, and when does the week start?
Calculating the Easter Date
The date of Easter Day depends on age-old approximations of the Full Moon and the March equinox.
The 823-Year Myth
5 Fridays, 5 Saturdays, and 5 Sundays in the same month happens only every 823 years? This popular urban myth is precisely that: a myth.
What Are Palindrome Days?
A palindrome date is when the day鈥檚 date can be read the same way backward and forward. When is the next palindrome date?
Why Does a Week Have 7 Days?
It's Monday, you have to wait 5 days till the weekend. Why does a week have 7 days, and why in that order? Thank the Moon and an ancient people in today's Iraq.
11/11/11 鈥� a date with a special meaning?
The meaning of dates, such as 11/11/11, is becoming more popular since the start of the new millennium.
The Doomsday Algorithm - Calculating the Weekday of any given Date
Some dates fall on the same weekday every year. Use this knowledge to calculate the weekday of any date in your head.
Friday the 13th Facts
13 facts about Friday the 13th, the unluckiest day in the Gregorian calendar.
The Doomsday Rule
Some dates fall on the same weekday every year. Use this knowledge to calculate the weekday of any given date in your head.
Special Calendar Dates
Learn more about numerically unique calendar dates such as sequential dates, same number dates, and palindrome (reversible) dates
12/12/12 - Special Date Pattern
December 12, 2012 or 12-12-12 was the last date of its kind—when all three numericals in a date were the same—for 88 years.
Long Weekends in the US and the UK
A long weekend happens when a holiday falls right before or after the weekend (e.g., Friday or Monday). Find a list of recurring UK and US long weekends.
Anniversary and Birthday Traditions Around the World
Anniversaries and birthdays are celebrated differnetly in different cultures around the world.
99% of Earthlings See Sunlight on July 8 (And on Other Dates, Too)
Our Sun data confirm an internet meme claiming 99% of the world鈥檚 population gets sunlight at 11:15 UTC on July 8. But does it happen on other dates, too?
99% Of Us See Daylight at This Moment (Or Do We?)
Is it really true that 99% of the world's population see daylight at 11:15 UTC on July 8?
Dec 6: Minute of Global Darkness
There's a moment each year when almost 9 in 10 people worldwide experience night.