Business Days Calculator
Count Korean business days between two dates with public and substitute holidays excluded automatically, or find the date a number of business days later.
- Map, weather, agency, or public-information pages can differ from current conditions because providers publish on their own schedules. Confirm the official source before visiting, paying, or applying.
Count Korean business days between two dates with public and substitute holidays excluded automatically, or find the date a number of business days later.
Example Business Days Calculator result Business days: 20 Weekend days: 8 Weekday holidays: 2 (2026-09-24 Chuseok break, 2026-09-25 Chuseok) Next step: For contractual deadlines, compare the counting start and end-date rules with the contract terms.
How to use Business Days Calculator
Counts business days between two dates or finds the date that is a given number of business days after a start date.
Weekends and Korean public holidays are removed automatically, including Lunar New Year and Chuseok breaks, substitute holidays, election days, temporary holidays, and Labor Day and Constitution Day, which became holidays in 2026. Holidays cover 2020 to 2027.
- Choose between counting business days in a period and finding a date N business days later.
- Enter the start and end dates or the number of business days, and whether to include the start date.
- Add company closure days in advanced settings, one YYYY-MM-DD date per line.
- Review the business-day count, the period breakdown and the weekday holidays found.
Useful for
- Setting delivery or processing deadlines in months with Lunar New Year or Chuseok
- Estimating completion dates for bank or government procedures quoted in business days
Limits and checks
- If Saturdays are working days for you, switch Saturday to a business day in advanced settings.
- Adding N business days counts the next business day after the start date as day one; check your contract's counting rule.
Worked example
September 2026 with Chuseok
Mode: business days in a period Start date: 2026-09-01 End date: 2026-09-30 Include start date: yes
The Chuseok day on Saturday 26 September is counted as a weekend day.
Business-day result
Business days: 20 Weekend days: 8 Weekday holidays: 2 (2026-09-24 Chuseok break, 2026-09-25 Chuseok)
Company closures must be added as extra holidays.
Common issues
A company closure day was counted
Company-specific closures are not public holidays. Add them as extra holidays in YYYY-MM-DD format.
Holidays after 2027 are not removed
Holiday data covers years whose official calendars are published, currently through 2027. Add later holidays manually.
How to interpret the result
First confirm that the weekday holiday list matches the actual calendar.
Related workflow
For contractual deadlines, compare the counting start and end-date rules with the contract terms.
Privacy and review notes
Dates and extra holidays are processed in your browser with a bundled holiday list and kept only in the page address; nothing is sent to ToolBada.
Basis and limitations
Basis
- The page organizes map, weather, agency, schedule, or everyday public-information references.
- The browser page groups public-reference items so users can quickly start a focused check.
Limitations
- Hours, locations, fees, closed days, administrative rules, and availability can change between a provider's publication date and the current local situation.
- Any real visit, payment, application, or travel plan can be affected by current local conditions.
Official check
- Before visiting, paying, applying, or leaving, confirm the latest details with the official site, map service, or phone contact.
References and methodology
- Official external source: Korea Public Data Portal — The Korean government portal for checking public-data providers and update metadata.
Review scope: We automatically check that the calculation basis and official source links are shown. No licensed medical, legal, or tax professional has reviewed this result individually, so confirm with the responsible agency or a professional before an important decision.
FAQ
How many business days are in September 2026?
Of 30 days, removing eight weekend days and the two Chuseok holidays on weekdays (24 and 25 September) leaves 20 business days.
Are substitute and temporary holidays removed?
Yes. Substitute holidays, election days and government-designated temporary holidays are included and checked against official lists. Add any newly announced temporary holiday manually.
Are Labor Day and Constitution Day holidays?
An April 2026 amendment made Labor Day (1 May) and Constitution Day (17 July) public holidays, so they are removed from 2026 onward.