SAS 中的日期计算 [英] Date calculations in SAS

问题描述

我想为任意 SAS 日期添加 1 天.我有以下有效的代码，但我想知道是否有对这样的日期计算的内置支持:

I want to add 1 day to an arbitrary SAS date. I have the following code that works but I wonder wether there is built-in support for date calculations like this:

proc fcmp outlib=whatever;  
function lastDayInYear(d);  
    if datdif(d,mdy(12,31,year(d)),'ACT/365')=0 then return(1); else return(0);  
endsub;  

function advanceDate(d);
    if d=. then return(.);
    if lastDayInYear(d) then
        return(mdy(1,1,year(d)+1));
    else
        return(datejul(juldate7(d)+1));
endsub;
quit;

推荐答案

Itzy 是对的...只需加 1.如果你想做更高级的日期计算，你可以使用 intnx()和 intck() 函数.

Itzy is right... just add 1. If you want to do more advanced date calculations you can use the intnx() and intck() functions.

例如

data _null_;
  tomorrow            = date() + 1;
  same_day_next_month = intnx('month',date(),1,'same');
  first_day_next_week = intnx('week' ,date(),1,'beginning');
  last_day_of_year    = intnx('year' ,date(),0,'end');

  put _all_; 
run;

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