将日期(年月日)转换为天数 [英] Convert date (year month day) to day count

问题描述

我希望给定3⍴⎕TS的函数(使用公历规则)将返回1+自1 1 1开始的天数.如果函数名为X，则为EG:

I would like a function (using Gregorian calendar rules) given 3⍴⎕TS would return 1+ the number of days since 1 1 1. EG if the function were named X:

      X¨ (1 1 1) (1 12 31) (2 12 31) (3 12 31) (4 12 31)
1 365 730 1095 1461

我需要这个，所以我可以减去两个日期以找出它们之间的天数.

I need this so I can subtract two dates to find the number of days between them.

推荐答案

请参见以下示例-函数X假定索引原点1如下:

Please see the following example - function X assumes index origin 1 as follows:

r←X b  
r←(0 31 59 90 120 151 181 212 243 273 304 334)[b[2]]    
r←r+b[3]+(365×b[1]-1)+-/⌊(b[1]-3>b[2])÷4 100 400

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