Time Calculator

Add/subtract mode carries hours, minutes and seconds the way you'd expect on a clock — for example, 45 minutes plus 30 minutes rolls over into 1 hour 15 minutes rather than showing 75 minutes. Time-between mode instead finds the elapsed duration between two clock times, including handling the case where the end time falls on the next day.

These modes cover everyday scheduling questions: adding up recorded time segments like exercise or task logs, working out how long a shift or meeting runs, or finding out how much time is left until something later today.

Time-between mode handles crossing midnight correctly — for instance, 10pm to 2am comes out to 4 hours — but it works purely with clock times, not calendar dates. For a duration that spans multiple full days, pair this tool with the Date Difference Calculator to get the day count and use this one for the hours-and-minutes portion.