The Julian calendar approximated the mean tropical year as 365.25 days and proposed 366-day leap years for every one divisible by four.

儒略历将太阳年划为365.25天，闰年366天，每四年一次。

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The JewishToJD() function converts a Jewish calendar date to a Julian day count.

函数的作用是：将犹太历转为儒略日计数。

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Note: To convert between calendar formats, you must first convert to Julian day count, then to the calendar format.

注意：在不同的日历系统中 转换，必须先将其 转换为儒略日计数，然后 转换为 目标日历格式。

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In 1918, in the Soviet Union, January 31 under the Julian Calendar system was the last day of its use.

CNN: Saturday,

On the contrary, no feast day for Sol is mentioned on that day until 80 years later in the Calendar of 354 and, subsequently, in 362 by Julian the Apostate in his Oration to King Helios (the Sun).

FORBES: Christmas and the Adoption of the Pagan Solstice