These are called the Revision Zones. These zones are used to eliminate overtime caused by employees that are clocking IN for a shift too early or OUT after the end of a scheduled shift. The time is adjusted within these zones. Revision zones take precedence over rounding rules established in Time Clock Rules. You can use just an IN zone or OUT zone or both for a particular department.
Example: An IN Zone set at 7:00am to 8:00am for a given department will adjust the start time to 8:00am for anyone that punches IN within the zone time.
An OUT Zone set at 5:00pm to 5:15pm for a given department will adjust the end time to 5:00pm for anyone that punches OUT within the zone time.
NOTE: The actual IN and OUT punch times will still appear in your reports. Just the totals are rounded.