SAS data sets have two variable types: numeric and character.
If a variable is numeric and has been assigned a date type format you might be able to find them. Or your variables have been assigned a label with the word Date as part of the label.
If you don't have either of those then unlikely and either of those would require searching the data set variable attributes, likely creating a macro variable and then using the macro variable in Keep data set option.
It may be easier to just run proc contents or examine table properties directly in the SAS Explorer to find these.
Unfortunately when "dates" are buried in character values or simple numeric values like 19960422 without a format they are unlikely to be found.