干支年表
Gan Zhi Year Table
用? (Use?)
其实提供这个更改的功能也许是多此一举的。因为若更改了[用0=-1年]及[用1984年]的标准计算方法，我们得到的干支纪年及它的相对应公元纪年将完全与常用的年表记录不符。所以除非你认为[用0=-1年]及[用1984年]无法正确推算出某个时代的干支纪年，否则 请不要应用这项更改的功能！
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Actually this might be a redundant function. This is because when the standard method which [Use 0=-1 year] & [Use year 1984] is altered, the Gan Zhi year & its corresponding Gregorian year will be completely different from the normal records of the year table we used to. Hence, unless you think that [Use 0=-1 year] & [Use year 1984] can not extrapolate the correct Gan Zhi year of a certain period of time, or else please do not use this altering function!
关于[用0=-1年]及[用1984年]
(1)为什么[用0=-1年]？
[用0=-1年]其实是处理[公元0年]的一种方法，即[公元0年=公元前1年]。一般上人们数东西的习惯是从1开始，人们会说1,2,3,...而不是0,1,2,3,...。因此用在纪年上，人们自然会说公元1年,2年,3年,...，而对公元1年之前的年份会说公元前1年,前2年,前3年,...。但从(...,-3,-2,-1,0,1,2,3,...)的数学概念看，介于-1与1之间其实还有0这个数字，因此，说[公元1年]之前的那个年份是[公元0年]，在数学上是成立的。当然，我们可以用[约定俗成]的方法规定[公元0年=公元前1年]。所以[用0=-1年]的意义其实就是告诉人们(或指示电脑)在运算过程中若碰到0年，就用[约定俗成]的方法处理，即[公元0年=公元前1年]。而[用0=0年]自然就是规定[公元0年=公元0年]了。
(2)为什么[用1984年]？
因为1984年本来就是一个甲子年。当然我们也可以用任何1984(+)或(-)60的倍数的年份(比如：1984+60x1=2044, 1984-60x2=1864, 1984-60x10=1384)做为甲子年。
(3)为什么说[用0=-1年]及[用1984年]是标准？
因为由此所得到的干支纪年及它的相对应公元纪年完全与常用的年表(比如：中国历代纪元表---可在各大词典的附录找到)记录符合。另外，由于[用0=-1年]其实只是基于人们数东西的习惯，所以应该说是一种[约定俗成]的标准。
About [Use 0=-1 year] & [Use year 1984]
(1)Why [Use 0=-1 year]?
This is a way to manage the Gregorian's 0 year, i.e [0 year = 1 BC year]. Usually people are used to start counting from 1, they will say 1,2,3,..., but not 0,1,2,3,....Thus, applying this habit to the counting of year, people would naturally say year 1, year 2, year 3,..., and for those years that come before year 1, people would say year 1 BC, year 2 BC, year 3 BC,....But from (...,-3,-2,-1,0,1,2,3,...)'s mathematics point of view, there is a number 0 that comes between -1 & 1, thus it is acceptable in mathematics to say that the particular year that come before year 1 is year 0. Of course, by means of the [rule of thumb], we can set [0 year = 1 BC year]. Hence the meaning of [Use 0=-1 year] is to tell people (or instruct the computer) to follow the [rule of thumb] which set [0 year = 1 BC year] when 0 year is encountered during any calculation. And naturally, it follows that [Use 0=0 year] means to set [0 year = 0 year].
(2)Why [Use year 1984]?
This is because 1984 is a Jia Zi year. Of course we can also use any year that is 1984 (+) or (-) mutiple 0f 60 (eg: 1984+60x1=2044, 1984-60x2=1864, 1984-60x10=1384) as a Jia Zi year.
(3)Why [Use 0=-1 year] & [Use year 1984] = Standard?
This is because by using these settings, the Gan Zhi year and its corresponding Gregorian year obtained are completely tally with the normal records of the year table (eg: Year Table for Various Chinese Emperor Period --- can be found in the appendix section of any major Chinese Dictionary) we used to. Furthermore, as [Use 0=-1 year] is in fact merely base on people's counting habit, thus it should be said that it is a standard by the [rule of thumb].