DateDelta

Time Duration Calculator

Enter a start and end time — get the exact elapsed time, even if it crosses midnight.

Handles overnight shifts automatically

If the end time is earlier than the start time (like a 10 PM to 6 AM shift), the calculator assumes the end time falls on the next day rather than showing a negative duration.

Time duration vs. date difference

This calculator works within a single day (or overnight), measuring hours and minutes. For spans measured in days, weeks, or years, use a date difference calculator instead.

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DateDelta

Time Duration Calculator

Enter a start and end time — get the exact elapsed time, even if it crosses midnight.

Start hour (0–23)

Start minute

End hour (0–23)

End minute

Duration (hours)

8.5

If the end time is earlier than the start time, we assume it wraps past midnight.

Total minutes: 510

What you entered

Start hour (0–23): 9Start minute: 0End hour (0–23): 17End minute: 30

1
Difference between end and start time
17:30 − 09:00= 510 minutes
2
Convert to hours and minutes
510 ÷ 60= 8h 30m

Result

Duration (hours): 8.5

From 9:00 to 17:30 is 510 minutes.

Handles overnight shifts automatically

If the end time is earlier than the start time (like a 10 PM to 6 AM shift), the calculator assumes the end time falls on the next day rather than showing a negative duration.

Time duration vs. date difference

This calculator works within a single day (or overnight), measuring hours and minutes. For spans measured in days, weeks, or years, use a date difference calculator instead.