Calendar dating

In doing so, this implementation uses the convention that the year prior to year 1 is year 0.

This differs from the Julian calendar in which there is no year 0—the year before year 1 in the Julian calendar is year −1.

The foundation of Chinese Astrology is from Yin Yang and Five Elements, which are Metal, Water, Wood, Fire and Earth.

All Chinese Zodiac signs, Rat, Cow, Tiger, Rabbit, Dragon, Snake, Horse, Sheep, Monkey, Chicken, Dog and Pig, 12 Chinese Zodiac signs can be converted into Five Elements.

As a purely solar calendar, no attempt is made to synchronise the start of months to the phases of the Moon.

While one can't properly speak of “Gregorian dates” prior to the adoption of the calendar in 1582, the calendar can be extrapolated to prior dates.

This date is defined in terms of a cycle of years, but has the additional advantage that all known historical astronomical observations bear positive Julian day numbers, and periods can be determined and events extrapolated by simple addition and subtraction.

Julian dates are a tad eccentric in starting at noon, but then so are astronomers (and systems programmers!

A slight modification of the Gregorian calendar would make it even more precise.A (MJD) is created by subtracting 2400000.5 from a Julian day number, and thus represents the number of days elapsed since midnight () Universal Time on November 17, 1858.Modified Julian Days are widely used to specify the epoch in tables of orbital elements of artificial Earth satellites.When comparing historical dates, it's important to note that the Gregorian calendar, used universally today in Western countries and in international commerce, was adopted at different times by different countries.Britain and her colonies (including what is now the United States), did not switch to the Gregorian calendar until 1752, when Wednesday 2nd September in the Julian calendar dawned as Thursday the 14th in the Gregorian.

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