Date Calculator — Duration, D-Day & Korean Business Days | utilo.kr
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※ Korean holiday data: 2024–2030 (KASI source)
How to use
Cover five date operations in one place — duration between two dates, add or subtract days, count business days, find a future business day, and run a D-Day countdown.
- Select a mode tab: Duration / Add-Subtract / Business Days / Count Business Days / D-Day.
- Pick the dates required for that mode (start, end, or reference).
- Duration shows the gap broken down into years, months, days, weeks, hours, and minutes.
- Business-day modes automatically skip Korean public holidays and weekends.
Holiday data uses Korea Astronomy & Space Science Institute (KASI) values for 2024–2030. After that, only weekends are excluded.
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