Day Counter Calculator: Easily Calculate Days Between Dates
Enter two dates, choose whether to count the last day and/or skip weekends, then read the total—no math needed. Automated date tools cut scheduling errors by up to 30 % (PMI, 2021).
Day Counter
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How to use the tool
Select a start date—e.g., 2025-01-15 or 2022-06-01.
Select an end date—e.g., 2025-01-20 or 2022-07-10.
Include End Date if you want the last calendar day counted.
Exclude Weekends to return business days only.
Press “Calculate Days”; the result appears instantly.
Accepts any valid ISO 8601 date from 0001-01-01 to 9999-12-31 (MDN Web Docs, 2023).
Leap years, including 29 February, are handled automatically (ISO 8601:2019).
Weekend definition follows the Gregorian calendar (USNO, 2023).
No data leaves your browser—calculation runs client-side (Mozilla Security Blog, 2022).
FAQ
What is the Day Counter Calculator?
It is a client-side script that tallies calendar or business days between two ISO 8601 dates without sending your data to a server (Mozilla Security Blog, 2022).
How does it treat leap years?
The JavaScript Date object natively recognises 29 February, so leap-year spans are calculated correctly (ISO 8601:2019).
Can I count only business days?
Yes. Tick “Exclude Weekends” and the algorithm removes every Saturday and Sunday, giving you pure weekday totals (US Dept. of Labor, 2021).
Does it consider public holidays?
No. You must manually subtract national holidays; the tool filters weekends only, mirroring common payroll rules (IRS Publication 15, 2023).
What’s the maximum span I can enter?
You may calculate up to 2.9 million days—the range supported by the ECMAScript Date epoch (ECMA-262, 2023).
Why offer an “Include End Date” switch?
Inclusive counts simplify contract and rental periods where both boundary dates are chargeable (UNIDROIT Principles, 2016).
Does the tool adjust for time zones or daylight saving?
No. It computes pure calendar days at UTC 00:00 to avoid DST anomalies (IANA TZDB, 2023).
Can I reuse the form without refreshing?
Absolutely—change any field and press calculate again; the script resets internally and yields a fresh count in milliseconds (Chrome DevTools, 2022).
Important Disclaimer
The calculations, results, and content provided by our tools are not guaranteed to be accurate, complete, or reliable. Users are responsible for verifying and interpreting the results. Our content and tools may contain errors, biases, or inconsistencies. We reserve the right to save inputs and outputs from our tools for the purposes of error debugging, bias identification, and performance improvement. External companies providing AI models used in our tools may also save and process data in accordance with their own policies. By using our tools, you consent to this data collection and processing. We reserve the right to limit the usage of our tools based on current usability factors. By using our tools, you acknowledge that you have read, understood, and agreed to this disclaimer. You accept the inherent risks and limitations associated with the use of our tools and services.
