Can I calculate business days only?

This version calculates total calendar days. Business day logic (skipping weekends/holidays) is planned for a future update.

Does it work for historical dates?

Yes, it supports dates hundreds of years in the past or future.

Can I add or subtract a specific number of days from a date?

Yes. Enter a start date and a number of days, weeks, or months to add or subtract, and the tool returns the resulting date immediately.

Does the calculator include or exclude the end date?

By default the difference is calculated exclusive of the end date (like most calendar systems), but the result shows total days so you can adjust as needed.

Can I use this to count business days?

The standard mode counts all calendar days. A business-days mode that skips weekends may be available depending on the current version of the tool.

Can I calculate working days while excluding public holidays?

The Date Calculator can exclude weekends when counting business days, but it does not have a built-in public holiday calendar because holidays vary by country and jurisdiction. To exclude specific holidays, subtract the number of public holidays that fall within your date range from the business-day result. For automated workflows that require precise business-day calculations with regional holidays, consider using a dedicated API such as Nager.Date or a spreadsheet with a custom holiday list.

Date Calculator — Difference, Add & Subtract Days

About Date Calculator

Perfectly plan your projects or milestones by calculating dates precisely. This tool allows you to add or subtract time intervals from any date, or find the exact number of days between two specific dates.

How to Use

Pick a 'Start Date' from the calendar tool.
Enter the number of years, months, or days to add or subtract.
Instantly view the resulting date and the day of the week it falls on.
The calculation updates in real-time as you modify the values.

Common Use Cases

Calculating project deadlines and delivery estimates.
Tracking pregnancy milestones or subscription renewal dates.
Finding the exact number of days for legal contracts or travel planning.

Technical Details

Leverages the browser's native Date object with robust error handling for month-overflows and timezone offsets.

Frequently Asked Questions

Can I calculate business days only?: This version calculates total calendar days. Business day logic (skipping weekends/holidays) is planned for a future update.
Does it work for historical dates?: Yes, it supports dates hundreds of years in the past or future.
Can I add or subtract a specific number of days from a date?: Yes. Enter a start date and a number of days, weeks, or months to add or subtract, and the tool returns the resulting date immediately.
Does the calculator include or exclude the end date?: By default the difference is calculated exclusive of the end date (like most calendar systems), but the result shows total days so you can adjust as needed.
Can I use this to count business days?: The standard mode counts all calendar days. A business-days mode that skips weekends may be available depending on the current version of the tool.
Can I calculate working days while excluding public holidays?: The Date Calculator can exclude weekends when counting business days, but it does not have a built-in public holiday calendar because holidays vary by country and jurisdiction. To exclude specific holidays, subtract the number of public holidays that fall within your date range from the business-day result. For automated workflows that require precise business-day calculations with regional holidays, consider using a dedicated API such as Nager.Date or a spreadsheet with a custom holiday list.

Local processing

Our local file, text and chart tools process content on your device using JavaScript, browser APIs and, where needed, WebAssembly. Our usage events do not include filenames, file contents, input text, chart values, raw errors, emails or license references. Network lookup tools (such as DNS, WHOIS, IP and speed tests) contact external services for their stated purpose. Loading the website, fonts, libraries and models also makes network requests. WebAssembly itself does not prevent network access.