SAS 全球日期比较 [英] SAS Global date comparison

问题描述

我正在尝试进行日期比较，但没有得到正确的结果.有谁知道这是怎么回事?

I'm trying to do a date comparison but I'm not getting the correct results. Does anyone know what's going on?

%macro ttt;
    %let check_start = 28APR2014;
    %if "&check_start."d < "25may2014"d %then %let true = 1;
    %else %if "&check_start."d > "25may2014"d %then %let true = 2;
    %put &true;
%mend;
%ttt;

14         %macro ttt;
15          %let check_start = 28APR2010;
16          %if "&check_start."d < "25may2014"d %then %let true = 1;
17          %else %if "&check_start."d > "25may2014"d %then %let true = 2;
18          %put &true;
19          %mend;
20          %ttt;
true = 2

宏变量true应该等于1

Macro-variable true should equal 1

推荐答案

在这种情况下，您需要使用 %sysevalf() 来评估比较.以下作品.

You need to use %sysevalf() to evaluate the comparison in this case. The following works.

%macro ttt;
    %let check_start = 28APR2015;
    %if %sysevalf("&check_start"d < '25may2014'd) %then %let true=1;
    %else %if %sysevalf("&check_start."d > '25may2014'd) %then %let true=2;
    %put &true.;
%mend;
%ttt;

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