intck语句疑问

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各位高手，有一段程序出不来结果，请教哪里有问题。谢谢！
data v;
input id fn$ ln$ hired$;
informat hired$ date9.;

cards;
403 BOWDEN EARL 24DEC79
1121 HERNANDEZ MICHAEL 24DEC79
1412 MURPHEY JOHN 08DEC79
;
run;
proc print data=v;
run;

data s;
set v;

Years=intck('year',hired,today());

run;

proc print data=s;
run;

结果years missing.The SAS System

ObsidfnlnhiredYears
1403BOWDENEARL24DEC79.
21121HERNANDEMICHAEL24DEC79.
31412MURPHEYJOHN08DEC79.

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关键词：intck int informat Michael missing 疑问

because variable 'hired' is character, you need to convert it to numeric.
simple way to do like the program below

data v;
input id fn$ ln$ hired$;
cards;
403 BOWDEN EARL 24DEC79
1121 HERNANDEZ MICHAEL 24DEC79
1412 MURPHEY JOHN 08DEC79
;
run;
proc print data=v;
run;

data s;
set v;
hired=input(hired,date9.);
Years=intck('year',hired,today());
run;

proc print data=s;
run;