What Decade Is It?

[skysidhe]

Your tenth birthday is the end of your 9th year. You begin a 10th year.

A human lifespan isn't counted in the same way as the earths.
It has leap years and leap seconds.




18th century

1701-1800


19th century
1801-1900


The Twentieth Century of the Common Era began on January 1, 1901 and ended on December 31, 2000. according to the Gregorian calendar, (2000 was the first century leap year since 1600).

In the Gregorian calendar, a Century leap year is a year that is exactly divisible by 400 (and, thus, as with every other leap year, qualifies for the intercalation of February 29). The years 1600 and 2000, for example, were century leap years; the century years of 1700, 1800, and 1900 were not century leap years. The next century leap year will occur in 2400. Century leap years always start on a Saturday, and the February 29 intercalation of such years is always a Tuesday.
The century year "divisible by 400" rule of the Gregorian calendar was considered an improvement over the previously utilized Julian calendar which had provided for a leap year every four years; this practice resulted, over the centuries, in too many leap days being added to the calendar and placing it out of step with the astronomical seasons.

[dar512]

Originally Posted by skysidhe

Your tenth birthday is the end of your 9th year. You begin a 10th year.

That doesn't sound right. Your first birthday is the end of your first year, right?

How many birthdays do people have on average? Trick question. Just one. Technically the rest are anniversaries of your birthday.

[Happy Monkey]

Originally Posted by skysidhe

Your tenth birthday is the end of your 9th year. You begin a 10th year.

Originally Posted by dar512

That doesn't sound right. Your first birthday is the end of your first year, right?

Correct. Your tenth birthday is at the end of the year you are nine, which is the tenth year you have been alive.

[Radar]

Originally Posted by skysidhe

Your tenth birthday is the end of your 9th year. You begin a 10th year.

A human lifespan isn't counted in the same way as the earths.
It has leap years and leap seconds.




18th century

1701-1800


19th century
1801-1900


The Twentieth Century of the Common Era began on January 1, 1901 and ended on December 31, 2000. according to the Gregorian calendar, (2000 was the first century leap year since 1600).

In the Gregorian calendar, a Century leap year is a year that is exactly divisible by 400 (and, thus, as with every other leap year, qualifies for the intercalation of February 29). The years 1600 and 2000, for example, were century leap years; the century years of 1700, 1800, and 1900 were not century leap years. The next century leap year will occur in 2400. Century leap years always start on a Saturday, and the February 29 intercalation of such years is always a Tuesday.
The century year "divisible by 400" rule of the Gregorian calendar was considered an improvement over the previously utilized Julian calendar which had provided for a leap year every four years; this practice resulted, over the centuries, in too many leap days being added to the calendar and placing it out of step with the astronomical seasons.

Exactly.