📅calculaFechas

📅 Days Between Dates Calculator

Calculate the exact number of days between any two dates — free and instant. Handles leap years, month lengths, and spans of any size. Free to use — no sign-up, instant results.

📅 Format: MM/DD/YYYY

06/17/2026
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About This Tool

The Days Between Dates Calculator is the most fundamental date tool you'll ever need. Whether you're planning a vacation, counting down to a wedding, tracking a project deadline, or simply curious how long it's been since an important event, this calculator gives you an instant, precise answer. Just pick two dates and click Calculate — no formulas, no spreadsheets, no mental gymnastics required.

Behind the scenes, the calculator uses UTC-based arithmetic to avoid any timezone confusion. It correctly handles leap years (which add an extra day to February every four years), accounts for months with different lengths, and works accurately across centuries of dates. The result is always the exact number of calendar days — not an estimate, not an approximation.

You can also toggle two helpful options: 'Include end date' adds one extra day to count both the start and the end (useful for event durations like a 5-day conference that starts Monday and ends Friday), and 'Exclude weekends' switches the calculation to business days only — perfect for professional and contractual use. calculaFechas is completely free, requires no account, and works instantly on any device.

This tool is used by project managers tracking deliverable windows, HR professionals calculating notice periods, travellers planning itineraries, lawyers measuring statutory deadlines, and students figuring out how many days until their next exam. Wherever two calendar dates need to be compared, the Days Between Dates Calculator delivers reliable results in under a second.

See also:🎂 Age Calculator💼 Business Days Calculator🗓️ Weeks Between Dates Calculator

Examples

Jan 1 to Dec 31 (same year)
364 days
Jan 1, 2020 to Jan 1, 2025
1,827 days
Monday to following Friday
4 days (5 with end date)

Frequently Asked Questions

How do I calculate days between two dates?+
Simply select your start date and end date using the date pickers above, then click 'Calculate'. The result appears instantly below the button, showing the exact number of days between the two dates. You can also see the equivalent in weeks and hours.
Does the calculator include the start and end date?+
By default, the calculator counts from the start date up to but not including the end date (exclusive end). This follows the ISO 8601 standard. If you want to include both the start and end dates — for example, counting an event that runs from Monday through Friday as 5 days rather than 4 — tick the 'Include end date' checkbox before calculating.
How accurate is the calculation?+
100% accurate. Our calculator uses UTC date arithmetic, which correctly handles leap years (February 29), variable month lengths (28–31 days), and avoids timezone drift. The result will always match what you'd get counting manually on a calendar. We have verified the calculations against ISO 8601 date difference standards.
Can I calculate business days instead of calendar days?+
Yes! Simply check the 'Exclude weekends' option before clicking Calculate. The result will then show only working days (Monday to Friday), automatically excluding all Saturdays and Sundays within the date range. This is ideal for calculating project timelines, invoice payment windows, or any professional scheduling.
What is the maximum date range I can calculate?+
calculaFechas supports dates from the earliest recognisable calendar dates through to the far future — so you can calculate across thousands of years if needed. There is no practical limit on the date range, and the calculator handles century boundaries and multi-decade spans without any issues.
Can I use this on my phone or tablet?+
Absolutely. calculaFechas is fully responsive and optimised for all screen sizes. The touch-friendly date pickers work perfectly on iOS Safari and Android Chrome. No app download needed — just open it in any mobile browser and the full functionality is available immediately.
Is this calculator free?+
Yes, completely free. No sign-up, no subscription, no hidden fees. calculaFechas is supported by non-intrusive advertising, which allows us to keep all tools free forever. You can use any tool as many times as you like without any cost.
Why does my result differ from another date calculator?+
Small differences usually come down to whether the end date is included or excluded, or timezone differences. Our calculator uses the UTC standard and excludes the end date by default — consistent with ISO 8601. Use the 'Include end date' option to match calculators that count inclusively. If the difference is more than 1 day, it may be a timezone issue in the other calculator.
Can I calculate days between dates in the past?+
Yes. If your start date is more recent than your end date, the calculator will still return a result — but it will be 0 (since we take the absolute difference). To get days in the past, simply enter the earlier date as the start and the later date as the end. For example, to find how many days ago January 1, 2020 was, enter Jan 1, 2020 as start and today as end.
What is a calendar day vs a business day?+
A calendar day counts every day of the week including Saturday and Sunday. A business day (also called a working day) counts only Monday through Friday, excluding weekends. Our calculator returns calendar days by default, but you can switch to business days by checking the 'Exclude weekends' option.

Related Tools

🎂Age Calculator💼Business Days Calculator🗓️Weeks Between Dates Calculator➕Add Days to Date