What Is a Leap Year?
A leap year has 366 days, as opposed to a common year, which has 365. Nearly every four years is a Leap Year, and we add a leap day, an extra day on February 29. more
A leap year has 366 days, as opposed to a common year, which has 365. Nearly every four years is a Leap Year, and we add a leap day, an extra day on February 29. more
The twelve months of the year are January, February, March, April, May, June, July, August, September, October, November and December. Each month has either 28, 30 or 31 days during the common year. more
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. more
The Chinese calendar is one of the oldest calendars in modern society. It is a lunisolar calendar. more
The Gregorian calendar is the internationally accepted civil calendar that was first adopted in 1582. more
The Julian calendar reformed the Pre-Julian Roman calendar and consists of three cycles of 365-day years followed by a 366-day leap year. more
The fall (autumnal) equinox in the Northern Hemisphere is in September. In the Southern Hemisphere it's in March. more
The Maya calendar consists of a system of three interlacing calendars and almanacs which was used by several cultures in Central America, most famously the Maya civilization. more
2020 is the next leap year when you get an extra day on February 29. more
The Vernal (Spring) Equinox in the Northern Hemisphere is in March. In the Southern Hemisphere it's in September. more
The Roman or “pre-Julian” calendar has changed several times between its creation during the founding of Rome and the fall of the Roman Empire. more
Some dates fall on the same weekday every year. Use this knowledge to calculate the weekday of any date in your head. more
The Gregorian calendar was first introduced in 1582, but different countries changed from the Julian Calendars at different times. more
September is the ninth month of the year in the Gregorian calendar, but the name means 'seventh', as it was the seventh month in the ancient Roman Calendar. more
Learn more about Leap Day traditions, superstitions and folklore. more
August is the eighth month of the year in the Gregorian calendar and is named after Augustus Caesar. more
February 30 actually existed at least twice in the past, according to historical records. more
Some dates fall on the same weekday every year. Use this knowledge to calculate the weekday of any given date in your head. more
Learn more about numerically unique calendar dates such as sequential dates, same number dates, and palindrome (reversible) dates more
Toast the New Year 40 times with our new year countdown. 26 hours after the first bottle pops on Kiritimati in the Pacific, Baker Island greets the New Year. more
The Mayan calendar ended one of its great cycles in December 2012, which has fueled countless predictions about the end of the world on December 21, 2012 at 11:11(UTC). more
When do “leaplings” celebrate their birthdays – every year or only during leap years? more
The meaning of dates, such as 11/11/11, is becoming more popular since the start of the new millennium. more
October is the tenth month of the year in the Gregorian calendar. more
January is the first month of the year in the Gregorian calendar and named after the two-faced Roman god Janus. more
Friday the 13th, also known as Friday 13 or Friday the thirteenth, has been considered as a day of bad luck in various countries for many years. more
Our calendar does not accurately reflect the length of a tropical year, the time it takes Earth to complete a full orbit around the Sun. Why is that so and are there other calendars that do a better job? more
Instead of adding one leap day on February 29 nearly every four years, the Chinese add a leap month every 3 years to keep their calendar in line with the Earth's rotation. more
Wednesday is the day third of the week between Tuesday and Thursday and is named after Germanic god Wodan and Odin, the Norse allfather of the gods. more
Monday is the first day of the work week and is between Sunday and Tuesday. more
December is the twelfth and last month of the year in the Gregorian calendar. more
The Jewish leap year has 13 months and occurs 7 times in a 19-year cycle. more
February is the second month of the year in the Gregorian calendar. It is the shortest month with only 28 days in common years and 29 days in leap years. more
November is the eleventh month of the year in the Gregorian calendar. more
Thursday is the fourth day of the week between Wednesday and Friday, and is named after Thor, the hammer-wielding Norse god of thunder. more
Only on October 10, 2010 and in the next hundred years can people write the date as 10/10/10. more
June is the sixth month of the year in the Gregorian calendar, and is named after the Roman goddess Juno. more
July is the seventh month of the year in the Gregorian calendar and is named after Julius Caesar. more
A leap year in the the Islamic Hijri calendar occurs 11 times in a 30-year cycle, in which one day is added to the last month of the year. more
In many Northern Hemisphere cultures, the June solstice is associated with holidays, feasts and celebrations. more
April is the fourth month of the year in the Gregorian calendar, and is named after the Greek goddess Aphrodite. more
Sunday is the day of the week that is between Saturday and Monday. more
March is the third month of the year in the Gregorian calendar and named after Mars, the Roman god of war. more
The Hindu leap year has an extra month and occurs once every 3 years or 4 times in 11 years. more
Friday is the fifth day of the week, between Thursday and Saturday, and the last day of the working week in most western countries that follow ISO 8601. Friday is named after the Norse fertility goddess Frigg. more
Tuesday, named after the Norse god Tyr, is the second day of the week in most countries, but some count it as the third day of the week. more
Saturday is the day of the week that is between Friday and Sunday. more
May is the fifth month of the year in the Gregorian calendar and named after the Greek godess Maia. more
A leap year occurs every four years in the Ethiopian calendar, when one extra day is added at the end of the year. more
A Palindrome Day happens when the day’s date can be read the same way backwards and forwards. The dates are similar to word palindromes in that they are reversible. Depending on the date format Palindrome Days can be rare. more
December, 12, 2012 or 12-12-12 was the last date of its kind - when all three numericals in a date are the same - for the next 88 years. The next time this will happen is on January 1, 2101, or 01-01-01. more
Most western countries use the Gregorian calendar, but some use other calendars. Some calendars even add a leap month instead of a leap day. more
The Iranian or Persian calendar has about eight leap years in a 33-year cycle. An extra day is added to the last month in a leap year. more
The Bahá'í leap year occurs when five extra days are added between the last two months of the calendar. Leap years usually occur every four years. more
A common year is a calendar year without an extra or intercalary day. more
13 facts about Friday the 13th, the unluckiest day in the Gregorian Calendar. more
The Revised Julian calendar is one of the most accurate calendar systems ever developed. How does it work, and why don't we use it? more
The definition of a tropical year, also known as a solar year, astronomical year, or equinoctial year, is the time it takes the Earth to complete a full orbit around the Sun, and it is approximately 365.242189 days long. more
Watch daylight move across the planet... More
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