How to define the century by year or millennium by year?

Many people find it difficult to answer the question: "How to determine the age of the year in which this or that event occurred?" In general, there is nothing complicated. Now you yourself will see it.

our era

For events that occurred in the time period of our era (that is, everything from our days to a period of just over two thousand years ago), the century is calculated as follows: the last two digits are discarded for the year, and one is added to the result. Let's say we need to find out in what century the Great Patriotic War began. This happened in 1941. We discard the last two digits (41) and add one to the remaining numbers (19). The number 20 is obtained. The Great Patriotic War began in the twentieth century. Another example - Prophetic Oleg died in 912. What century was it? We drop the numbers 12, add one to the nine and understand that the Kiev prince died in the tenth century.

There must be one clarification. A century is a gap of a hundred years. If the last two digits of the year is 01, then this is the first year of the beginning of the century. If 00 is the last year of the century. Thus, in our rule there is an exception. If the last two digits of the year are zeros, then we do not add one. How to define such a century for the year? For example, Pius VII became Pope in 1800. In what century did this happen? We discard the last two digits of the date, but keep in mind that these are zeros, and do not add anything. We get 18. Pius VII became the Pope in the XVIII century. And the next year came the XIX century. We have figured out the definition of what century a year includes, in relation to our era. And if we are talking about events that happened before?

BC

Here everything is somewhat more complicated. From 1 year to 100 years BC - this is the first century BC. From 101 to 200 - the second, and so on. Thus, to determine the age of the year before Christ, we must discard the last two digits of the year and add one. And in the same way, with the last figures in two zeros - nothing is added. Example: Carthage destroyed in 146 BC. E. How to determine the age of the year in this case? We discard the last two digits (46) and add one. We get the second century BC. And do not forget about our exception: the catapults were invented in 400 BC. We drop the last two digits, keep in mind that these are zeros, and do not add anything. It turns out that the catapults were invented in the 4th century BC. It's simple!

Millennium

Since we have figured out how to define a century for the year, let's try at the same time to learn how to define the millennium. Here, too, there is nothing complicated. Only discard will not have two, but the last three digits of the date, and add as before 1.

Example: Alexander II abolished serfdom in 1861. In what millennium did he do it? We discard the last three digits (861) and add one more to the remaining one. The answer is the second millennium. There are also exceptions. If the last three digits are zeros, then the unit is not added.

The national currency "Somoni" was introduced in Tajikistan in 2000. That is, it happened in the second millennium.

That is why those who celebrated the coming of the third millennium and the 21st century in 2000 were mistaken - these events occurred only next year.

If you understand all this simple arithmetic, then now you know exactly how to define a century by year or even find out the number of the millennium.