Jullian dating

Date fields in JD Edwards World files are stored in the Julian format.

Program X0028 converts these dates into the Gregorian format so they are easily recognized in World software applications.

During the changeover between calendars and for some time afterwards, dual dating was used in documents and gave the date according to both systems. The ordinary year in the previous Roman calendar consisted of 12 months, for a total of 355 days.

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In practice, intercalations did not occur systematically according to any of these ideal systems, but were determined by the pontifices.

So far as can be determined from the historical evidence, they were much less regular than these ideal schemes suggest.

According to the later writers Censorinus and Macrobius, the ideal intercalary cycle consisted of ordinary years of 355 days alternating with intercalary years, alternately 377 and 378 days long.

In this system, the average Roman year would have had days over four years, giving it an average drift of one day per year relative to any solstice or equinox.

This discrepancy was corrected by the Gregorian reform of 1582.

The Gregorian calendar has the same months and month lengths as the Julian calendar, but, in the Gregorian calendar, years evenly divisible by 100 are not leap years, except that years evenly divisible by 400 remain leap years.

It was the predominant calendar in the Roman world, most of Europe, and in European settlements in the Americas and elsewhere, until it was refined and gradually replaced by the Gregorian calendar, promulgated in 1582 by Pope Gregory XIII.

The Julian calendar gains against the mean tropical year at the rate of one day in 128 years.

Although Greek astronomers had known, at least since Hipparchus, a century before the Julian reform, that the tropical year was slightly shorter than 365.25 days, the calendar did not compensate for this difference.

As a result, the calendar year gains about three days every four centuries compared to observed equinox times and the seasons.

The Julian calendar has a regular year of 365 days divided into 12 months, as listed in the table below. The Julian year is, therefore, on average 365.25 days long.

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