How do I calculate the number of days between two dates?

Subtract the start date from the end date in milliseconds, then divide by 86,400,000 (milliseconds per day) and take the floor value. This gives the total number of calendar days between the two dates.

What are business days?

Business days are working days excluding weekends (Saturday and Sunday). Public holidays are not automatically excluded as they vary by country. This calculator counts weekdays (Monday–Friday) in the range.

How do I calculate months between two dates?

Months between dates = (end year - start year) × 12 + (end month - start month). Adjust for the day of month if you need precision. The calculator also shows remaining days after whole months.

Can I calculate a future date from today?

Yes. Set the start date to today and the end date to any future date. The calculator will show exactly how many days, weeks, and months remain until that date.

📅 Free Calculator

Date Difference Calculator

Find the exact number of days, weeks, months, and years between any two dates. Includes business day count.

Start Date

End Date

Quick Select

What This Calculator Shows

📅

Total Days

The exact number of calendar days between two dates, including or excluding the end date.

📆

Weeks & Months

Converts the total days into whole weeks, months, and remaining days for easy understanding.

💼

Business Days

Counts only Monday to Friday working days — useful for deadlines, contracts, and project planning.

🗓️

Weekend Days

Shows how many Saturdays and Sundays fall between the two dates.

Frequently Asked Questions

Subtract the start date from the end date. The result in milliseconds divided by 86,400,000 gives you the total days. Our calculator does this instantly and also gives you weeks, months, and business days.

No. This calculator counts Monday–Friday as business days only, without excluding public holidays, as holidays vary by country and region. Subtract the applicable holidays manually for country-specific accuracy.

Yes. Set the start date to today and the end date to your event. The calculator will show exactly how many days, weeks, and months you have left until that date.

The count includes the start date and is up to (but not including) the end date, which is the most common convention. For inclusive counting (both dates counted), add 1 to the result shown.

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⚠️ Disclaimer: Date calculations are for general informational purposes only. For legally binding deadlines, contractual timelines, or regulatory requirements, always verify with the relevant authority or a qualified legal professional.