Question: are your start_day and end_day actually SAS date values?
You will in the long run save yourself a lot of headaches later if you get into the habit of using 4 digit years for display (unless of course you have a dinosaur-like boss that requires 2 digit years).
Quick, tell me what the date is in words for 01/02/03.
Without more information you might even get the wrong century.
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