Calculate elapsed time between two times on the same day.
If the end time is earlier than the start time, the calculator treats the end as occurring on the following day.
Time duration is the difference between a starting time and an ending time. The calculation is easiest when both times use the same clock convention and are interpreted within the intended day or schedule.
From 09:20 to 13:50, the elapsed duration is 4 hours and 30 minutes. For an interval that crosses midnight, the intended dates matter: 23:30 to 01:00 on the following day is 1 hour and 30 minutes.
A clock time by itself does not always identify a unique interval. Be explicit about AM and PM, the date when midnight is crossed, and any daylight-saving transition that affects a real-world schedule.
Use it for study sessions, work blocks, meetings, travel planning, and simple time tracking. For dates separated by multiple calendar days, use the Date Difference Calculator instead.