Business Day / Due Date Calculator
Compute business days excluding weekends and Korean public holidays (with substitute holidays) — find a due date or count business days between two dates. Add company off-days too.
Compute real business days excluding weekends and public holidays (with substitute holidays). Find a due date, or count business days between two dates. Add company off-days too. All in your browser.
Loading holidays…
Add company off-day (optional)
※ Temporary government holidays and some substitute holidays may not be included. Verify important deadlines and add days above if needed.
🔒 Dates are calculated in this browser only and never sent.
Due date or count
Enter a start date and a number of business days to get the due date, or two dates to count the business days between them (inclusive).
Holidays included
Korean public holidays, including lunar ones (Lunar New Year, Chuseok, Buddha's Birthday) and substitute holidays, are skipped. See which holidays were skipped.
Add company off-days
Add your own off-days so company holidays count too. Temporary government holidays may not be included, so verify important deadlines. All in your browser.
Frequently asked questions
Are Korean holidays included?
Yes, including lunar holidays and substitute holidays; you can also add company off-days.
Is my input sent anywhere?
No. Dates are calculated in your browser only.