Help using Base SAS procedures

IF-THEN Loop

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IF-THEN Loop

Hi,

I use the code as -

data Week;
set Day;
IF ("1/01/2001"<=Date<="7/01/2001") then 'Week'= 'Week1';
IF ("8/01/2001"<=Date<="14/01/2001") then 'Week' = 'Week2';
IF ("15/01/2001"<=Date<="21/01/2001") then 'Week' = 'Week3';
ELSE IF ("22/01/2001"<=Date_of_Sale<="28/01/2001")then 'Week' = 'Week4';
run;

The date is character in the code .

LOG ERROR 180-322: Statement is not valid or it is used out of proper order.


Kindly suggest where am wrong or any articles that deal with this coding...

Regards,
Mark
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