Timespan Calculator
A timespan calculator helps you find the exact duration between any two dates or times. Enter a start date and an end date, and the tool instantly shows the total timespan in years, months, weeks, days, hours, minutes, and seconds. Every number updates live as you change the dates.
People use this tool in many situations. Project managers use it to measure how long a project has been running or how many days remain until a deadline. HR teams use it to calculate employee tenure or notice periods. Event planners use it to count down to a wedding, conference, or launch date. Students use it to track study timelines. Legal teams use it to count contract periods. Developers use it to measure sprints. Anyone who needs to know exactly how long between two points in time can use this tool.
The tool works with dates, times, or both together. You can measure a duration across years like from January 2015 to December 2024, or across a single day like from 9:00 AM to 5:30 PM. The live preview updates the moment you change any input, so you do not need to click a button to see the answer. A business days toggle lets you exclude weekends and holidays from the count when you only care about working days.
The result is broken down into every useful unit. Total years, months, weeks, days, hours, minutes, and seconds. You also see the total days and total weeks at a glance. A detailed breakdown shows exactly how many years, months, and days fit into the timespan, plus the remaining hours and minutes.
Every result comes with a copy button so you can save the full duration to your clipboard. The tool runs in your browser, needs no signup, and works on desktop and mobile.
Enter your dates and instantly see the timespan.
Frequently Asked Questions About Timespan Calculator
Is this timespan calculator free to use?
Yes. The tool is completely free with no signup, no limits, and no hidden charges.
How does the timespan calculator work?
Enter a start date and an end date. The tool calculates the exact duration in years, months, weeks, days, hours, minutes, and seconds. The result updates live as you change the dates.
Can I calculate timespan between two times on the same day?
Yes. Enter the date and time for both the start and end. The tool measures duration down to the second.
What is the difference between calendar days and business days?
Calendar days count every day including weekends and holidays. Business days exclude Saturdays, Sundays, and any holidays you add. Use business days when you only care about working days.
Does the tool count the end date?
By default the tool does not include the end date in the count, which is the standard method for measuring elapsed time. You can enable the “Include End Date” toggle if you need to count it.
Can I use this for legal or HR calculations?
Yes, but always verify with your legal or HR advisor. Date calculations can vary based on jurisdiction and specific contract language. The tool provides a general estimate.
Does the calculator save my data?
No. Everything runs in your browser. Your dates are never uploaded to any server.
Can I use this tool on mobile?
Yes. The calculator works on all devices including phones, tablets, and desktop computers.