Time Duration Calculator

Compare start and end times in time-only or date-and-time mode and see the elapsed span in days/hours/minutes/seconds plus total hours, minutes, and seconds.

Elapsed timeTime-only or local civil date-time

Start time

End time

When end time is earlier

Date & time mode measures the difference between local civil timestamps without applying a named time zone or DST rule. Use Time Zone Converter when zone-aware elapsed time matters.

Elapsed duration

9h 30m 0s

570 total minutes

9.5 hDecimal hours

570 minTotal minutes

34,200 sTotal seconds

0.395833 d24-hour days

09:30:00HH:MM:SS

ForwardDirection

Same dayRollover

08:15:00 → 17:45:00 = 9h 30m 0s

Ready

Core timing workflows

Start with a direct timer, stopwatch, alarm or focus workflow. Calendar, date arithmetic, clocks and scheduling specialists remain available from the full Date & Time hub.

All 76 date & time tools

Online TimerCountdown, sound, repeat & fullscreen StopwatchLaps, precision & fullscreen Countdown TimerFocused countdown workflow Alarm ClockAlarm at a local clock time PomodoroFocus and break cycles Interval TimerWork/rest rounds Presentation TimerTalk timing with warnings Classroom TimerProjector-friendly countdown

How to use this Time Duration Calculator

Use Two Times for a clock-to-clock span, including an optional next-day rollover when the end is earlier. Use Date & Time for local civil timestamps on different dates, then review normalized duration and decimal totals.

What the result means

Compare start and end times in time-only or date-and-time mode and see the elapsed span in days/hours/minutes/seconds plus total hours, minutes, and seconds.

Elapsed-time mode boundary

Time-only mode can roll an earlier end clock into the next day. Date & time mode compares local civil timestamps and intentionally does not apply an IANA time-zone/DST rule.