Double post deleted.
You can refer to a specific day without knowing the numeric value on SAS's date scale. For example:
if datevar = '04Apr2018'd then do;
The date must be in quotes, must be in the format illustrated here, and must add a "d" after the closing quote.
If StartDate = '01Jan2018'd
The "D" tells SAS to treat the string constant as a date.
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