Time Calculator Pro is a useful little program with an interactive GUI that lets you add, minus, subtract and divide time values. You can also convert fractional time values into whole hours, minutes and seconds or vice-versa. People who need to sum the play time of their music tracks or movie files before burning them onto CD or those who simply need to perform arithmetic on time values will find this program to be a real time, pen and paper saver. It sure beats doing the calculations manually.