Time Duration Calculator — Days, Hours & Minutes Between Two Dates
Calculate the exact duration between any two dates and times. Get results in years, months, days, hours, minutes, and seconds — all at once. Enter a start and end date to see the complete time breakdown instantly.
Useful for calculating project durations, time since an event, days until a deadline, how long you've been at a job, or the length of any period in history.
Free foreverNo data storedInstant resultsAccurate formula
Enter start and end date / time
Enter a start and end date above to calculate the duration.
Duration breakdown
Years
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Total months
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Total days
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Total hours
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Total minutes
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Total seconds
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How Time Duration Is Calculated
The calculator finds the absolute difference in milliseconds between the two date-time values and converts it into each unit. One important note: "years" and "months" shown are approximate (based on average lengths), while days, hours, minutes, and seconds are always exact.
Example: From January 1, 2020 at 00:00 to October 24, 2026 at 12:00 ≈ 6 years · ≈ 81 months · 2,488 days · 59,724 hours · 3,583,440 minutes
Common use cases
Project management: how long did a project take from kickoff to delivery? HR: how long has an employee worked at a company? Legal: how many days are in a contract period? Events: how long until a concert, wedding, or deadline?
For legal or financial calculations (loan periods, contract terms, statute of limitations), always verify the exact method specified in your jurisdiction — calendars can differ in how they count business days, months, and years.
Frequently Asked Questions
How many days between two dates?
Enter the start and end dates above. The calculator will show the exact number of days between them, accounting for leap years and varying month lengths.
Can I calculate working days (business days)?
This calculator shows calendar days. To find working days, subtract weekends: multiply the number of weeks by 5, then add the remaining weekdays. For holidays, you will need to subtract those manually based on your country.
How many days until a specific date?
Enter today as the start date and your target date as the end date. The calculator will show how many days remain.
How accurate is the time calculation?
Days, hours, minutes, and seconds are exact. Years and months are approximate because months have different numbers of days and years have 365 or 366 days. For legal or contractual calculations, always use the specific counting method required.