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A date to day of week calculator determines which day of the week any calendar date falls on. Uses the Doomsday algorithm or JavaScript's built-in Date object for instant results.
공식
weekday = (Zeller's congruence or similar algorithm)
- date
- Date (YYYY-MM-DD) — Input date
- weekday
- Day of week (text) — Monday, Tuesday, ..., Sunday
단계별 가이드
- 1JavaScript Date parses the date string
- 2getDay() returns 0 (Sunday) through 6 (Saturday)
- 3The Gregorian calendar repeats every 400 years
- 4Any date in history or future can be calculated precisely
풀어진 예시
입력
January 1, 2000
결과
Saturday
입력
July 4, 1776
결과
Thursday
입력
December 25, 2026
결과
Friday
자주 묻는 질문
How can I tell what day a date falls on?
Use Zeller's congruence or a calendar algorithm. The calculator handles this automatically.
What if I need the ISO week number?
ISO weeks run Monday–Sunday, with week 1 containing January 4. Different from US Sunday-start weeks. Specify which standard is needed.
How far back does this work?
Gregorian calendar calculations are valid from Oct 15, 1582 onward. For earlier dates, consult historical sources.
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