날짜 더하기·빼기 계산기
기준 날짜에 년, 개월, 주, 일 또는 업무일을 더하거나 뺍니다.
연산
결과
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월말 처리 규칙
시작일의 날짜가 대상 월에 없으면 그 달의 마지막 날로 조정됩니다. 예: 1월 31일 + 1개월 = 2월 28일 (윤년에는 2월 29일).
예시
- 2026-01-31 + 1 month = 2026-02-28 (month-end rule applied).
- 2024-01-31 + 1 month = 2024-02-29 (leap year).
- 2026-07-24 (Friday) + 3 business days = 2026-07-29 (Wednesday) — the weekend is skipped.
자주 묻는 질문
What happens with January 31 + 1 month?
February has no 31st, so the result is clamped to the last day of February — the 28th, or the 29th in a leap year. The tool tells you whenever this month-end rule was applied.
How do business days differ from calendar days here?
In business-day mode the tool steps one weekday at a time, skipping Saturdays, Sundays, and (if you pick a country) its public holidays. Adding 5 business days to a Friday therefore lands on the following Friday, not on Wednesday.
Are years and months added before or after days?
Years and months are applied first (with month-end clamping), then weeks and days. This matches how contracts and deadlines are usually interpreted, and it makes the calculation explainable step by step.