Duration between two dates and times
Pick a start date and time and an end date and time; the calculator returns the span broken into days, hours and minutes, plus the total in decimal hours. It's useful for project time, event length, elapsed time between two events, or any gap you need measured precisely across day boundaries.
Total hours for billing
The "Total hours" figure converts the whole duration to decimal hours, handy for invoices or timesheets that bill in hours regardless of how many days the work spanned.