Date Calculator

Calculate duration between dates (D-Day), add or subtract time, and calculate business days excluding weekends.

Changing the timezone may shift the date boundary based on the current time.

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Business Day Calc

The start date is included; the end date is excluded. Equal dates count as 0 days.

Business Days Count
5 Days
Exclude Saturdays and Sundays only
Based on: UTC

About Date Calculator

Compare dates, add calendar units and count business days.

Choose date difference, date addition or business days. Business days default to weekends only; select Korean holidays to exclude the bundled public-holiday dates too.

Use the result to check a planned deadline, retaining the country, coverage and endpoint rules with it.

The calculation or rendering runs in this browser tab. Copy, download and share actions make the chosen output available outside this tab.

Worked example

Input / settings
2026-05-04 to 2026-05-06
Action
Count business days; compare weekends-only with Korea
Result
2 days with weekends only; 1 day with Korean holidays because May 5 is excluded.

Scope and limits

  • Difference includes the start and excludes the end. Business-day addition skips the start, counts the target and accepts −5,000…5,000; zero returns the start.
  • Korean holiday coverage is 2026–2027, reviewed 2026-09-17. Unsupported years stop the holiday result. Company closures and later ad-hoc holidays are not inferred.
  • Date-difference/date-add tabs can shift their civil date when changing timezone. Business-day counting uses the entered calendar dates and country calendar.

Frequently asked questions

Does weekends-only exclude public holidays?
No. Select Korea explicitly. May 1 and July 17 are included in the 2026 public-holiday data; separate workplace leave rules can still differ.

Sources and review dates

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