How do I calculate time between two dates?

Select 'Between' mode, enter your start and end date/time, and the calculator will show the exact duration in years, months, days, hours, minutes, and seconds.

Can I add hours to a specific date?

Yes! Use the 'Add' or 'Subtract' mode, enter your starting date/time, specify the duration and unit (hours, days, weeks, etc.), and see the resulting date.

Date & Time Calculators

Time Duration Calculator

Calculate time between dates, add or subtract hours, days, weeks. Convert between time units instantly.

Time Settings

Start Date & Time

End Date & Time

Duration

8 hours

Time Breakdown

Days

Hours

Minutes

Seconds

Converted To

Total Days0.33

Total Hours8.00

Total Minutes480

Total Seconds28800

How Duration Calculation Works

This calculator computes the exact time difference between two dates and times, or adds/subtracts a specified duration to a date. Results are shown in multiple time units for convenience.

Duration Tips

1Use 'Between' mode to find how long until an event or how long since one occurred
2Use 'Add' mode to calculate future deadlines
3Use 'Subtract' mode to find what date was a certain time ago
4The Pomodoro technique uses 25-minute work sessions with 5-minute breaks
5Remember to account for time zones when calculating international event durations

Related Calculators

Business Days Calculator

Calculate working days between dates, add business days to a date, and exclude weekends and holidays automatically.

Date Difference Calculator

Calculate the time between two dates in days, weeks, months, and years. Also shows working days and weekends.