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From Latin facta, a date is a data (an indication of weather in which something happens or is done). In everyday language, it can be associated with a date with a specific day . For example: “What date is today? Today is May 12 ”, "The next tournament date will be played within four days".

The dates are systematized by a calendar , which is an account that allows the organization weather. Current calendars are based on the cycle of land In relation to Sun , so they get the name of solar calendars .

In addition to all of the above, it is important and interesting that we keep in mind that there are different formats to express dates. Thus, each country has its own or welcomes those that exist recognized worldwide that are usually usually of two clearly differentiated types.

In this way, one of those is known as the little endian format which is the one that is defined because it chooses to set two digits for the day, another two for the month and four for what is the year. A perfect example of that would be 18-03-1982.

Secondly, another of the most widespread formats is the one known by the name of big endian. In this case, any date is set by setting four digits for the year, two for the month and two for the day, in this order. A perfect sample of this dating system would be 1978-09-19.

However, there are countries that choose to use other recognized formats. Thus, for example, in the United Kingdom or France, it is decided to establish any date through three clearly distinct parts and each one with two digits. In this way, an example would be 17-08-84.

In Japan, however, it is decided to opt for two mentioned digits for year, month and day respectively. Thus, an example would be 12/02/25.

He official calendar in the western world it is currently the Gregorian calendar . His promoter was the Pope Gregory XIII , which established it in substitution of Julian calendar in 1582 . Under this calendar, on this date we live in 2009 , which assumes that that number of years have elapsed since the birth of Christ . Being a solar calendar, each year has a duration of 365 days (or 366 in leap years).

Elisabeth Achelis proposed in 1930 , a reform of the Gregorian calendar to turn it into a Perpetual calendar (where every year is the same). The proposal of Achelis It was known as world calendar and contemplates the organization of the dates in twelve months, which would be divided into four equal quarters.

Each quarter would have 91 days (13 weeks), starting on a Sunday and ending on a Saturday. The quarter would begin with a month of 31 days and continue with two months of 30 days.

In addition to all of the above, we have to underline that there are key and important dates in history, as they mark events of great importance, such as the taking of the Bastille within the French Revolution: July 14, 1789, in Paris.

Finally, it should be noted that it is known as almanac to the annual publication that contains information about certain dates and what is ordered in a calendar.

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