3 columns (Year, Day, Time) How do I make them Mon/Day/Year on a graph?

Function CreateDateTimeWave(year, dayOfYear, timeOfDay, newWaveName)
    Wave year
    Wave dayOfYear
    Wave timeOfDay          // 1200 represents noon
    String newWaveName      // Name for new wave
    
    Variable numPoints = numpnts(year)      // Assume all input waves have the same number of points
    
    Make/O/N=(numPoints)/D $newWaveName
 
    Wave w = $newWaveName               // Create wave reference to new wave
    SetScale d, 0, 0, "dat", w              // Tell Igor it is a date/time wave
    
    w = date2secs(year, 0, 0)               // Convert to Igor date/time format (seconds since 1/1/1904)
    
    w += dayOfYear * 60*60*24           // Add seconds corresponding to day of year
    
    w += (timeOfDay / 100) * 60*60      // Add seconds corresponding to time of day
End