Business date tools

Free Business Days & Deadline Calculators

DeadlineDays helps business teams calculate invoice due dates, SLA deadlines, shipping promises, payroll cutoffs, working days, and public holiday impact before a date is sent to a customer, vendor, or employee.

Browse calculators Count business days

Quick deadline check

Scenario: Invoice sent Friday with payment due in 10 business days.
Method: Count weekdays after the issue date, then review holidays and company closure dates.
Use: Share a defensible due date with finance, sales, and the customer before the invoice goes out.

No account required

Browser-side inputs

Holiday source notices

Popular business date calculators

Start with the rule your team has to follow, then use the result as a documented date assumption for review.

Business Days Calculator: Count Workdays by CountryCount business days between two dates by country, excluding weekends, public holidays, and custom company holidays.Add Business DaysFind a date after 10, 30, or any number of workdays, or subtract business days from a deadline.Net 30 & Invoice Due Date CalculatorCalculate Net 30, Net 45, Net 60, EOM, calendar-day, or business-day invoice payment deadlines with weekend and holiday adjustments.SLA Deadline CalculatorPlan SLA response deadlines with business hours, time zones, public holidays, and calendar-hour modes.Shipping Date Calculator: Estimate Ship & Delivery DatesEstimate ship dates, delivery windows, and shipping calendar dates with order cutoff time, handling time, transit days, and weekend rules.Payroll Cutoff Date CalculatorFind payroll cut off dates, pay dates, timesheet deadlines, cutoff buffers, and previous-business-day payroll adjustments.Working Days in a Month CalculatorCalculate how many working days, work days, business days, and work hours are in a month or year by country.Public Holidays by Country and RegionView public holidays by country, region, and year, with source notes for national, regional, bank, school, optional, and observed holidays.

What DeadlineDays helps with

The site is built for operational date decisions where a wrong business-day assumption can affect cash collection, support commitments, delivery promises, or payroll readiness.

Count business days between two dates before you commit to a customer deadline.

Add or subtract working days when a contract says net 10, five business days, or next working day.

Estimate invoice due dates, SLA response deadlines, shipping windows, and payroll cutoffs with weekend and holiday context.

Compare month-by-month working days for staffing, finance, and operations planning.

Check public holiday data with a visible source notice and a clear last-review date.

Keep calculations private: inputs stay in the browser and no account is required.

Real business examples

Each core calculator explains the input, calculation logic, result interpretation, and caution so the date can be reviewed by the person responsible for the commitment.

Invoice due after a month-end close

Input: Issue date: Friday, May 29, 2026. Terms: 10 business days. Region: United States.
Calculation logic: Skip Saturday and Sunday, count each weekday after the issue date, then review any public holiday that falls inside the range.
Result interpretation: The due date lands in mid-June, giving finance a practical collection date instead of a vague net-10 estimate.
Caution: Contracts may define whether the issue date counts as day 0 or day 1, so confirm the clause before sending a final invoice.

SLA response promised in business hours

Input: Ticket opened: Thursday afternoon. SLA: two business days. Non-working day: company holiday on Friday.
Calculation logic: Exclude the company holiday and weekend, then count two available business days from the next eligible workday.
Result interpretation: The response target moves to early the following week, which helps support avoid an avoidable breach.
Caution: The calculator estimates calendar dates, not hour-by-hour support coverage or time zone handoffs.

Shipping promise before a holiday weekend

Input: Warehouse ready date: Tuesday. Transit prep: three business days. Country: Korea.
Calculation logic: Count working days from the ready date, skip weekend days, and review national holidays before publishing the ship date.
Result interpretation: The sales team can publish a realistic dispatch date and explain why a holiday shifts delivery timing.
Caution: Carrier blackout dates, regional closures, and cutoff times can change the final commitment.

How calculations work

Choose the calculator that matches the business rule: count, add, subtract, invoice terms, SLA, shipping, payroll, monthly working days, or public holidays.
Enter the relevant dates and select the country when holiday awareness matters.
Add company-specific non-working dates when your organization closes outside the public holiday calendar.
Read the result together with the explanation and caution so the date can be checked against a contract, policy, or customer promise.

Countries, public holidays, and company closures

Holiday-aware tools show a Holiday Data Notice with the Nager.Date API source and the latest review date. You can also add your own non-working dates for office closures, payroll freeze days, or warehouse blackout periods.

The final deadline should still be checked against the governing contract, employment policy, logistics rule, or local regulation before it becomes a binding commitment.

Privacy-friendly by design

DeadlineDays does not require an account, login, or customer workspace to calculate a date. Calculator inputs are handled in the browser so teams can test ordinary date assumptions without submitting a private contract, payroll, support, or shipping record.

Why DeadlineDays is different

DeadlineDays is focused on practical business date decisions, not a generic list of calendar facts.

Country-specific public holiday data helps teams start from the right national calendar.

Custom non-working weekdays and company holidays support real workplace calendars.

Regional holiday coverage is used where reliable data is available.

Browser-side calculation, no login, and clear assumptions make results easier to review before copying or sharing.

Practical business contexts cover invoices, SLA commitments, shipping promises, payroll cutoffs, and public holidays.

English is the canonical home experience, and Korean is maintained as a secondary locale with matching calculator and support pages.

Available languages

Use the canonical English home page or the maintained Korean locale. Both versions include calculator pages, support pages, and visible privacy notes.

EnglishEnglish 한국어Korean

FAQ

Is the root homepage English?

Yes. The public home page is English-first and uses the canonical URL https://deadlinedays.com/.

Does DeadlineDays replace legal or payroll advice?

No. It helps teams calculate and document date assumptions, but final obligations should be checked against the governing contract, policy, or local rule.

Where does public holiday data come from?

Holiday-aware calculators display a Holiday Data Notice with the Nager.Date API source and the current review date.

Which languages are maintained?

English is the canonical home experience, and Korean is maintained as a secondary public locale with matching calculator and support pages.