Used for the business-day breakdown and excluded-holiday list.
Dates stay in your browser and are not saved.
Choose two dates to see the calendar and business-day breakdown
Dates stay in your browser and are not saved.
Choose a start date and number of days to find the deadline
What is a date calculator?
A date calculator finds the time between two dates or calculates a new date by adding or subtracting days. You can count ordinary calendar days or switch to business days to exclude weekends and public holidays. This makes the result useful for project deadlines, invoice payment terms, contract periods, leave planning, and delivery estimates.
The difference between calendar days and business days matters whenever a deadline affects real work. Calendar days include every day on the calendar. Business days normally include Monday through Friday and exclude public holidays in the selected market. A deadline that is 30 calendar days away can arrive much sooner than one that is 30 business days away.
For example, adding 30 calendar days to Monday, June 1, 2026, gives Wednesday, July 1, 2026. Adding 30 business days produces a later deadline because Saturdays, Sundays, and applicable public holidays do not count. The exact result depends on whether you select the USA, UK (England and Wales), or Canada.
Calendar days vs. business days
Use calendar days when every day counts, including weekends and holidays. Calendar-day calculations work well for subscriptions, notice periods written in calendar days, event countdowns, and general planning.
Use business days when the people or organizations involved operate on a standard workweek. Business-day calculations are more useful for client approvals, payment processing, shipping estimates, support response times, and project delivery dates.
Public holidays vary by country. Select the USA, UK (England and Wales), or Canada before calculating business days so the calculator can exclude the relevant national holidays. The result also shows which holidays were excluded, making the deadline easier to verify and explain.
How to use this date calculator
Find the days between two dates. Choose the start date and end date to see the total calendar days, full weeks, business days, weekends, and public holidays in the range. Use the inclusive option when the wording of your deadline includes both dates.
Add or subtract days. Choose a starting date, enter the number of days, and select add or subtract. Quick presets make common 7-, 14-, 30-, 60-, 90-, and 365-day calculations faster.
Choose calendar or business days. Calendar mode moves through every date. Business-day mode skips weekends and public holidays for your selected market. This is the safest mode for deadlines described as working days or business days.
Check the result details. Review the final date, day of the week, and excluded holidays before using the result in a contract, invoice, or client message. If you are setting a payment due date, create the finished document with our Invoice Generator.
Should the start date count as day one?
It depends on how the deadline is written. An exclusive count starts counting after the start date, which is common for phrases such as “within 30 days after receipt.” An inclusive count treats the start date as day one, which is useful for events, stays, and ranges that explicitly include both dates.
When a deadline comes from a contract, regulation, or official notice, check its counting rules before relying on the result. Some rules treat weekends and holidays differently or move a deadline that falls on a non-business day. This calculator helps with planning, but it does not replace the wording of the agreement or rule that created the deadline.