Duration Calculator
Calculate the difference between two dates, or add/subtract time.
Difference between two dates
Enter valid start and end dates.
Add / subtract duration
Enter a valid start date and amount.
About the Duration Calculator
Find the exact difference between two datetimes broken into years, months, days, hours, minutes and seconds, plus totals. Also add or subtract a custom duration from a date.
Examples
Days between
2026-01-01 to 2026-08-06Output
7 months, 5 daysKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
Related tools
Age Calculator
Date & Time
Calculate exact age and countdown to the next birthday.
Business Days Calculator
Date & Time
Count business days between two dates, excluding holidays.
Day of Year Calculator
Date & Time
Convert a date to its day-of-year number, or back again.
Leap Year Checker
Date & Time
Check if a year is a leap year and find nearby leap years.
Work Hours & Timesheet Calculator
Date & Time
Total up work hours across shifts with breaks and hourly pay.
ISO 8601 Converter
Date & Time
Convert dates and durations to and from ISO 8601 format.
Frequently asked questions
Read more
- The Pomodoro technique: why 25 minutes still works
A kitchen-timer method from the 1980s is still the most reliable focus tool a developer has. Here is what the timer is actually for, and how to tune the durations.
Comments
No login needed. Comments appear after a quick review.
Loading comments…
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser