Calculate time durations and hourly costs.
Duration = end time − start time, expressed in hours and minutes.
From 9:15 AM to 1:45 PM is a duration of 4 hours 30 minutes.
Yes. If the end time is earlier than the start, it assumes the end is on the following day.
Yes. Multiply the duration by an hourly rate to get a total cost.
Subtract break time from the total duration to get net working time.