Day of the Week Calculator
Find out what day of the week any date falls on — past, present or future. Check birthdays, holidays, anniversaries, and important dates instantly.
What Day of the Week Is This Date?
Our Day of the Week Calculator instantly tells you what day any date falls on. Whether you're checking a past event, planning for the future, or just curious, this tool gives you the answer in seconds.
Simply enter a date using the date picker or click one of the preset buttons. The calculator will show you the full day name, week number, day of the year, and more — all in one place.
How Does It Work?
The calculator uses JavaScript's built-in Date object to determine the day of the week for any valid date. It accounts for leap years, time zones, and the Gregorian calendar system, making it accurate for dates from 1970 to 2099 and beyond.
The day of the week is determined by the getDay() method, which returns a number from 0 (Sunday) to 6 (Saturday). This is then converted to a readable day name.
Common Uses for This Calculator
- Birthdays: Find out what day of the week you were born on.
- Anniversaries: Check what day your wedding or special event falls on.
- Holiday Planning: Determine the day of the week for upcoming holidays.
- Historical Dates: Discover what day historical events occurred.
- Project Planning: Know which day of the week a deadline or milestone lands on.
- Curiosity: Satisfy your curiosity about any date!
How Accurate Is This Calculator?
This calculator is highly accurate for dates within the range supported by JavaScript's Date object (approximately 1970 to 2099). For dates outside this range, results may vary. The tool uses your browser's local time zone for calculations, ensuring the day is correct for your location.
Frequently Asked Questions
Simply enter any date using the date picker or type it in manually, then click 'Find Day of the Week'. The calculator will instantly tell you the day of the week, along with the week number, day of the year, and more.
Yes! This calculator works for any date — past, present, or future. You can check historical dates, upcoming events, or any date you're curious about.
Yes, the calculator uses JavaScript's Date object which automatically accounts for leap years and the Gregorian calendar, making it accurate for all dates.
The calculator shows the full day name (e.g., Monday), the day of the week number, week number of the year, day of the year, month, year, and how many days ago or from now the date is.
The calculator supports dates from approximately January 1, 1970 to December 31, 2099, which covers most practical use cases. For dates outside this range, the results may be less reliable.
JavaScript's Date object can handle dates before 1970, but the date picker may not support them. You can manually enter the date in the input field (e.g., '1960-01-01') and the calculator will still work for most cases.