December 21 2017 how many days

December 9, December 10, December 11, December 12, December 13, December 14, December 15, December 16, December 17, December 18, December 19, December 20, December 21, December 22, December 23, December 24, From this point, many attempts were made to align the Republican calendar with the solar year including the addition of an extra month to certain years to supplant the lack of days in a particular year.

In 46 BC, the calendar was further reformed by Julius Caesar, introducing an algorithm that removed the dependence of calendars from the observation of the new moon. In order to accomplish this, Caesar inserted an additional 10 days into the Republican calendar, making the total number of days in a year He also added the intercalation of a leap day every fourth year, all in an attempt to further synchronize the Roman calendar with the solar year.

Despite all efforts, the Julian calendar still required further reform, since the calendar drifted with respect to the equinoxes and solstices by approximately 11 minutes per year. By , this resulted in a difference of 10 days from what was expected. An adjustment was also made to the algorithm of the Julian calendar that changed which century years would be considered leap years.

Under the Gregorian calendar, century years not divisible by would not be leap years. These changes reduced the error from 1 day in years, to 1 day in 3, years with respect to the current value of the mean solar year. The adoption of the Gregorian calendar occurred slowly over a period of centuries, and despite many proposals to further reform the calendar, the Gregorian Calendar still prevails as the most commonly used dating system worldwide.

A holiday is a day that, either by custom or by law, is set aside such that regular activities like going to work or school is suspended, or at least reduced. The term "holiday" can be interpreted differently, depending on the region.

In the U. Generally, holidays are meant to commemorate some event, person, or group of cultural or religious significance. Although certain holidays, such as Christmas and New Year's Day, are widely celebrated worldwide, most countries have their own set of holidays that are specific to the country, and even the same holidays may be observed differently within countries: some may receive a full suspension of typical daily activities, while others may only get partial days off.

Certain countries have holidays that essentially shut down almost all businesses. As an example, in Brazil, Carnaval do Brasil results in almost a full week in which only industrial production, retail establishments, or carnival-related businesses, function.

This calculator is mainly geared towards U. Certain holidays can also be excluded. December 21, December 22, December 23, December 24, December 25, December 26, December 27, December 28, December 29, December 30, December 31, January 1, January 2, January 3, January 4, January 5,