How to use: Calculate the time difference between two times of day for work shifts, appointments, or time tracking. Enter Start Time and End Time using 24-hour or 12-hour format (browser dependent). Results show: Duration in hours, minutes, seconds format, and Total Minutes. Useful for: calculating work hours (9 AM to 5 PM = 8 hours), meeting lengths, time tracking, shift duration, billable hours, and project time estimation. Note: Calculator assumes times are on the same day. For overnight shifts spanning midnight, the end time should be on the next day. Common uses: payroll calculations (8 hour workday = 480 minutes), time sheets, scheduling, and productivity tracking.