Time Duration Calculator

Enter the start date and time, then the end date and time. The calculator returns the duration in years, months, days, hours, minutes, and seconds. So from 1 March 9:00 AM to 5 March 6:30 PM, you'd get something like "4 days 9 hours 30 minutes". Useful for tracking project durations, contract periods, event lengths, and any "how long was that?" calculation that spans multiple days or includes specific clock times.

Enter start time and end time. The calculator returns elapsed duration in hours and minutes. So 9:30 AM to 4:45 PM = 7 hours 15 minutes. Crosses midnight automatically when the end time is earlier than the start. Useful for shift logging, meeting duration, study session tracking, or anything where you need to know how long something took. The result also shows in decimal hours for payroll and billing applications.

Enter the two dates (with times if you want sub-day precision). The calculator breaks the result into days, hours, and minutes. So a 100-hour duration shows as 4 days 4 hours 0 minutes. Useful for project timelines, travel planning, or any cross-day duration calculation. The breakdown makes it easier to think in human terms — "4 days plus a bit" reads more naturally than "5760 minutes" even though both numbers say the same thing.

Enter the start and end timestamps (date plus time). The calculator subtracts and returns the elapsed duration. Useful for race timing, event durations, deadline tracking, and any "how much time has passed?" question. The output is broken into multiple units — days, hours, minutes, seconds — for easy reading. Decimal hours are also shown for payroll, billing, and project-management software that expects hours rather than the human-readable format.

Type the start time and the end time. The calculator returns the difference in hours and minutes. So 8:15 AM to 12:45 PM = 4 hours 30 minutes. The tool handles AM/PM, 24-hour format, and crossings over midnight automatically. Useful for shift logs, meeting durations, and quick "how long did that take?" calculations. If your duration spans multiple days, use the time duration calculator with full date and time inputs instead.

Enter the two timestamps (date plus time). The calculator returns the duration in hours, including a decimal version for fractional hours. So from yesterday 6:00 PM to today 9:30 AM = 15.5 hours, or 15 hours 30 minutes. Useful for project tracking, freelance billing, and any cross-day duration where the hour total matters more than the day count. The decimal hours format works directly with most billing and payroll software.

Enter your start and end times — the calculator handles the midnight rollover automatically when the end time is earlier than the start. So 10:00 PM to 2:00 AM = 4 hours, with the calculator inferring the next-day end. If your shift spans multiple midnights, switch to the full date-and-time mode and enter both dates explicitly. Useful for night shifts, overnight events, late projects, and any duration that crosses calendar days.