OMG'sh!!! A life saver! This adds up every minute so I don't have to. I set it to calculate on the 1st of each month and end it on the 15th. Then I set it for the 16th through the 31st. It restarts each time period and totals everything on a daily bases adding each day's amount to the next and then 2 weeks later there's a total for payroll and then restarts again. Awesome time clock! Wish I bought it a year ago!!