SAS Functions extras for previous or next dates

As auxiliary functions of isBusinessDay, previousBusinessDayand nextBusinessDay, the functions ifNonBDayPreviousBDay and ifNonBDayNextBDay test whether the informed date is a business day, if not, it returns the previous or subsequent business day date, respectively to each function.

proc fcmp outlib=work.sas_functions.dateFunctions;

    /*
    =================== 
     * FUNCTION:ifNonBDayPreviousBDay
     * AUTHOR: Dutra - [e-mail]
     * DESCRIPTION: Checks if the given date is a working day, 
     otherwise returns the previous working day date
    ===================
    */
    function ifNonBDayPreviousBDay(date);
        if isBusinessDay(date) = 0 then
            return(previousBusinessDay(date));
        else return(date);
    endsub;

    /*
    =================== 
     * FUNCTION:ifNonBDayNextBDay
     * AUTHOR: Dutra - [e-mail]
     * DESCRIPTION: Checks if the given date is a working day, 
     otherwise returns the next working day date
    ===================
    */

    function ifNonBDayNextBDay(date);
        if isBusinessDay(date) = 0 then
            return(nextBusinessDay(date));
        else return(date);
    endsub;

quit;