Save As Excel file

I have a string output (buffer) and want to paste this into an excel file in a file location. Then 'Save As' with a new filename appended with datetime stamp. Note this excel has a macro that I would like to preserve in the new saved copy. Please help with some working code snippet. Thanks!
RPriy - Wed Nov 16 15:42:13 EST 2011

Re: Save As Excel file
Mathias Mamsch - Wed Nov 16 16:11:15 EST 2011

Re: Save As Excel file
SystemAdmin - Thu Nov 17 03:22:11 EST 2011

There is a nice exel example in DOORS lib, here is small part of it:

/*
 * This funciton saves the file as the passed in file name.
 */
void saveFileAs(string filename) {
    if(!fileOpen) {
                io4log << "ERRO : File not open\n";
                halt;
        }
        clear(args);
        put(args, "FileName", filename);
        
        checkRes(oleMethod(objWorkbook, "SaveAs", args))
        io4log << "INFO : File saved as " filename "\n";
}

and for the good file name with date-time here is some code which I used (thanks to this forum again) with minor changes:

string ZeroPrefixedInt(int i)
{
    string s = i ""
        if (i < 10)
        s = "0" s
        return s
}
 
string getZeroPrefixedTime()
{
        int now = intOf(dateAndTime(today))
        Date d = dateOnly(today)
        int day = intOf(date(stringOf(d)))
        int diff = now-day
        int hours = diff / 3600
        int mins = (diff - (3600 * hours)) / 60
        int secs = diff - (hours * 3600) - (mins * 60)
        
        return(ZeroPrefixedInt(hours) ZeroPrefixedInt(mins) ZeroPrefixedInt(secs))
 
}

here is the call:

string FileTimeStamp = stringOf(today,"yyyyMMdd") "-" getZeroPrefixedTime()
string fname_ExcelExport = "DOORS_ExcelExport_" FileTimeStamp ".xls"
saveFileAs(fname_ExcelExport)