Can this tool calculate business days (weekdays only) between two dates?

Yes. In Date Difference mode, the results include a breakdown of weekdays and weekend days within the selected date range, so you can see how many business days fall between the two dates.

Date Calculator

Find the exact difference between two dates, or add/subtract days, weeks, months & years from any date. Free, instant, no signup.

Start Date

End Date

About Date Calculator

This tool has two modes. Date Difference finds the exact duration between two dates in years, months, weeks and days, plus a weekday/weekend breakdown. Add/Subtract Date adds or removes a span of time from a starting date to find the resulting date.

All calculations use accurate calendar date arithmetic, correctly handling leap years and varying month lengths.

Recent Calculations

Free Date Calculator — Days Between Dates & Add/Subtract Time

If you've searched for "how many days between two dates" or "what date is 90 days from today" — this tool answers both instantly. The HB Tools Date Calculator by Haridash lets you find the exact duration between any two dates, or add and subtract days, weeks, months and years from a starting date. No software. No account. Completely free.

It's built for developers checking deadlines, project managers planning timelines, HR teams calculating leave periods, students tracking deadlines, or anyone who just needs an accurate date answer fast.

How to Calculate the Difference Between Two Dates

Switch to the Date Difference tab, pick a Start Date and an End Date, then click Calculate Difference. The tool shows the duration broken down into years, months and days, plus totals in weeks and days, and a weekday vs. weekend split — useful for estimating business days.

If the end date is earlier than the start date, the tool still calculates the duration and flags it as a date in the past relative to your selection.

How to Add or Subtract Days From a Date

Switch to the Add/Subtract Date tab. Pick a starting date, choose whether to Add or Subtract, enter a value, and select a unit — Days, Weeks, Months or Years. Click Calculate Date to instantly see the resulting date, its day of the week, and how many days that is from today.

This mode is commonly used for things like figuring out a deadline 30 days from a contract signing date, a due date 9 months from a known date, or a warranty expiry 2 years after a purchase date.

What Each Result Field Means

Years / Months / Days Breakdown — The calendar-accurate duration between two dates, the same way it would appear on an official document.

Total Days / Weeks — The entire duration converted into a single unit, useful for quick comparisons.

Weekday vs. Weekend Days — A count of how many weekdays (Monday–Friday) and weekend days (Saturday–Sunday) fall within the range — a quick way to estimate business days.

Inclusive Day Count — The total number of days counting both the start date and end date as full days, which some contracts and forms require.

Resulting Date (Add/Subtract mode) — The exact calendar date you land on after adding or subtracting the chosen amount of time, along with its weekday.

Common Uses for a Date Calculator

Project deadlines: Calculate how many days remain until a launch date or milestone.

Contracts and legal documents: Determine notice periods, expiry dates, or the exact duration of an agreement.

HR and leave planning: Work out how many calendar days or business days an employee's leave covers.

Event planning: Find a date a specific number of weeks or months before an event for sending invitations or finalizing bookings.

Health and pregnancy tracking: Add a set number of weeks to a known date to estimate a due date or milestone.

Finance: Calculate maturity dates for fixed deposits or loan terms a fixed number of months/years from a start date.

Why Calendar-Accurate Math Matters

Naively dividing total days by 30 to estimate months, or by 365 to estimate years, produces incorrect results because months have different lengths and leap years add an extra day roughly every four years. This calculator uses native calendar date arithmetic so that adding "1 month" to January 31st correctly lands on the last valid day of February, and date differences across leap years are always accurate.

Does This Tool Store My Dates?

No. All calculations happen instantly in your browser using JavaScript — nothing is sent to or stored on our servers. Recent calculations are saved only in your browser's local storage for convenience, and you can clear that history at any time.

Frequently Asked Questions

Switch to the Date Difference mode, enter a Start Date and an End Date, then click Calculate. The tool instantly shows the total days, weeks, months and years between the two dates, along with the weekday breakdown.

Switch to the Add/Subtract Date mode, enter a starting date, choose Add or Subtract, enter a value, and select a unit (days, weeks, months, or years). Click Calculate to see the resulting date and its day of the week.

By default, the calculator counts the difference exclusively — the number of full days that elapse between the two dates. The tool also shows an inclusive day count (counting both the start and end date) as a secondary figure.

Yes. In Date Difference mode, results include a breakdown of weekdays and weekend days within the selected range, so you can see how many business days fall between the two dates.

Yes. All calculations use native calendar date arithmetic, so leap years and varying month lengths are automatically handled correctly in both modes.

No. All calculations run entirely in your browser using JavaScript. Nothing is sent to or stored on our servers. Recent calculations are saved only in your browser's localStorage and can be cleared anytime.