📆 What Day Was It?
Find out what day of the week any date was — past, present, or future. Instantly see if it was a Monday, a Sunday, or any other weekday. Free, no sign-up. Free to use — no sign-up, instant results.
📅 Format: MM/DD/YYYY
About This Tool
The What Day Was It calculator answers one of the most universally asked date questions: 'What day of the week was [date]?' Whether you need to know on which weekday a historical event occurred, what day a contract was signed, which day a past holiday fell on, or simply which day of the week any specific date lands — this tool delivers the answer in a single click. No mental arithmetic, no calendar flipping required.
The calculation uses precise calendar arithmetic that correctly handles the full Gregorian calendar — including leap years (February 29 appears every 4 years, with century exceptions), and the 400-year Gregorian cycle. Results are accurate for any date from historical records through far-future planning. The result also shows whether the date was a weekday or weekend, and how many days ago (or ahead) it falls from today, giving you useful context at a glance.
Common uses include: verifying what weekday a past event occurred; confirming that a date mentioned in a contract was a working day; planning events by checking whether target dates fall on weekends; exploring historical date trivia; and satisfying the curiosity of knowing on which day of the week you were born. Pair this tool with the Days Between Dates calculator to get a complete picture of any date relationship.