Calculate the end date that falls after a chosen period from a base date.
Use this when you know the base date and the length of the period, such as '30 days from notice' or '3 months from signing'.
You can combine years, months, weeks, and days in one entry. Example: 1 year 6 months 2 weeks.
Enter the dates and period
to see the result
All results are reference information based on general principles of the Korean Civil Act. Actual legal effect and deadline outcomes can vary depending on the facts, special agreements, and other applicable statutes. Consult a qualified professional before relying on the result for an important legal action.
For a typical one-year period, the calculator starts from the next day when day one is excluded, applies Korean Civil Act calendar counting, and then checks whether the final day should move because it falls on a Saturday or Korean public holiday.
The calculator follows the Korean Civil Act approach of using the last day of the target month when no matching calendar day exists.
It is the general statutory baseline under Korean Civil Act rules, but specific agreements or special statutes can change the outcome. That is why the calculator lets you turn the extension on or off for reference.
This page is reviewed against the official sources below. Special statutes, case-specific agreements, or procedural rules can still change the final legal outcome.
Official statutory source used to review the general baseline for day-one counting, period expiry, calendar-based month and year counting, and holiday extension.
Official public-holiday data source referenced when the calculator checks Korean public holidays and substitute holidays.