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Date Difference Calculator

Calculate the exact difference between any two dates in years, months, days, weeks, hours, and minutes — with working days, weekend days, and a complete time breakdown.

Start Date

End Date

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How to Use the Date Difference Calculator

1
Enter your start date and end date using the date pickers. The calculator automatically handles dates in any order — if you enter the end date before the start date it will swap them automatically.
2
Click Calculate to see the exact difference between the two dates broken down into years months days weeks hours minutes and seconds.
3
The working days calculation counts all weekdays (Monday through Friday) between the two dates excluding Saturdays and Sundays. Note that public holidays are not excluded as these vary by country.
4
Download the free PDF report to save your date calculation — useful for project timelines contract durations lease periods and legal deadlines.

Example Calculation

Scenario: Start Date: January 1, 2020 | End Date: March 18, 2026

Exact Difference: 6 years 2 months 17 days
Total Days: 2,268
Working Days: 1,621
Weekend Days: 647

Total Weeks: 324 weeks 0 days
Total Months: 74
Start Day: Wednesday
End Day: Wednesday

Frequently Asked Questions

How is the date difference calculated?

The date difference is calculated by finding the total number of milliseconds between the two dates and converting to days. The exact breakdown into years months and days accounts for varying month lengths and leap years. For example February has 28 or 29 days depending on the year which affects the calculation. The working days count iterates through every calendar day between the two dates and counts only weekdays (Monday through Friday).

What are working days and why do they not include holidays?

Working days in this calculator are defined as Monday through Friday excluding Saturdays and Sundays. Public holidays are not excluded because they vary significantly by country state and employer. For example the United States has approximately 10 federal holidays per year while the UK has 8 bank holidays. If you need to calculate business days excluding specific holidays you should subtract the number of holidays that fall in your date range from the working days total.

What is the difference between calendar days and working days?

Calendar days count every day including weekends and holidays. Working days count only Monday through Friday. For a period of exactly one year there are 365 calendar days but typically only 261 working days (52 weeks times 5 weekdays plus 1 extra day). The difference of approximately 104 days represents the 52 Saturdays and 52 Sundays in a year. This distinction is important for legal contracts project timelines and payroll calculations.

How can I use this calculator for project management?

This calculator is useful for project planning by calculating the working days available between a project start and deadline. For example if you have a project starting January 1 and due March 31 you have 65 working days available. Knowing the exact working days helps with resource planning sprint calculations and deadline setting. Remember to subtract public holidays relevant to your team's location from the working days total for accurate planning.

Why might my lease or contract end date calculation differ from my calculator result?

Legal and contractual date calculations sometimes use specific conventions that differ from calendar counting. For example some contracts define a month as exactly 30 days regardless of the actual calendar month. Some leases use a 360-day year convention common in banking and finance. Some legal jurisdictions count the first day but not the last day of a period or vice versa. Always refer to the specific terms of your contract for the authoritative calculation method.