About the Time Calculator
Adding times is awkward because there are 60 minutes in an hour, not 100. This calculator adds and subtracts hours, minutes and seconds, works out the hours between two clock times (for timesheets, shifts and parking), and tells you the clock time after a given duration — handling overnight shifts that pass midnight.
Choose a mode. For hours worked, enter the start and end times and any unpaid break; you also get decimal hours for payroll. For durations, enter two times to add or subtract. For clock times, enter a start time and a duration.