Simple calculator for adding and/or subtracting one time of day from/with another. You can use 'regular time' formats for AM/PM or 'military time' such as 17:00 for 5:00 PM. Useful for payroll or estimating labor. Includes a calculator running tape feature for adding and subtracting time. Also, a Time-In and Time-out log automatically calculates the elapsed time. This feature replicates a time-clock card.