WORKLAZY TOOLS

Business Day & PTO Calculator

Calculate exact business days excluding weekends and Korean public holidays, and estimate PTO based on your start date.

• Business days
• Substitute holidays
• Hire-date basis
• Fiscal-year basis

Business days and data coverage

Both start and end dates are included. Saturdays, Sundays, holidays applicable on each date and registered additional holidays are excluded. A date is excluded only once even when reasons overlap; the details retain every exclusion reason.

Years 2000–2050 are supported. Holiday information was checked on 2026-10-14 and includes recorded designated dates through 2026 plus rules effective at the time. Later years are projected under current rules and exclude election or temporary holidays that have not been announced. New announcements can also change a recorded year.

Registering additional holidays

Select a company holiday date or paste several dates, then use the nearby Add button to register them. Draft text does not affect the result. Commas, whitespace and line breaks are accepted; duplicates are registered once. If any date is invalid, the entire input batch remains unregistered.

Dates outside the selected range remain in the list but do not reduce business days in that range. Remove a registered holiday using the button beside its date.

Leave amounts and their periods

Perfect attendance and at least 80% annual attendance are assumed. The monthly accrual total is historical first-year accrual of up to 11 days. It is not added to the current hire-cycle or fiscal-year grant as a remaining balance. Usage, expiry and carryover are not tracked; check company records for the actual available balance.

The hire-date method shows the grant for the current hire-date cycle. The fiscal-year method estimates the grant for the current year starting January 1. The first fiscal-year prorated amount uses 15 days × service days in the previous calendar year ÷ the total days in that year (365 or 366). Displaying two decimals does not impose a grant rounding rule; check company grant and settlement policies separately.

Supported dates and practical application

Hire dates from 1900 and calculation dates from 2018-05-29 through 2050-12-31 are supported. Monthly accrual history is unsupported for hires before 2017-05-30; unsupported history is never displayed as zero days.

Monthly and annual accrual dates model successive civil-calendar periods: accrual is estimated on the day after each completed attendance period. If a matching day is absent, the period expires at month-end and accrual follows the next day, without postponement for weekends. For example, a January 31 hire first accrues monthly leave on March 1. This is the calculator’s period interpretation assumption, not a definitive court ruling for individual cases.

General statutory eligibility assumes a workplace with at least five regular workers, an average of at least 15 working hours per week and the relevant attendance requirements. Falling outside these assumptions does not mean contractual leave is zero. Check company rules and actual attendance. Actual-workday methods, company rounding, resignation settlements and unused-leave payments are not calculated.

Date offsets and vacation planning

Business-day offsets use the same weekend, public holiday and custom holiday rules. Start inclusion counts a working anchor as the first day; zero returns the anchor. Results outside the supported range are rejected.

Add full or half days per vacation date. Re-adding a date replaces its unit. Weekends and holidays cost no leave and remain natural days off. Working half days split full-rest periods. Each period and the longest period include adjacent weekends and holidays, stopping at supported date boundaries.

Plans calculate locally with no storage or upload. Vacation plans are not combined with annual awards or past monthly history into a remaining leave balance.

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