Date and Time / Free Tools
Free Day of the Week Calculator
Use this free day of the week calculator to instantly find out what day any date falls on - past, present, or future. Just enter a date and see the weekday, how many days away it is, and its week number in the year. No sign-up required.
What is a day of the week calculator and why it matters
A day of the week calculator takes any calendar date and tells you which weekday it falls on - Monday, Tuesday, and so on. This matters for a range of everyday and practical uses: confirming what day a historical event happened, checking what day your birthday lands on next year, verifying a contract or deadline date, or planning around a specific future weekday without manually counting through a calendar.
How this calculator works
This tool uses the date's position within the Gregorian calendar - the standard calendar used internationally today - to work out its weekday, week number, and position in the year. It also compares your chosen date to today's date to tell you how many days away it is, whether that's in the past or the future.
Common searches this calculator answers
- What day of the week was I born?
- What day of the week does a specific date fall on?
- How many days are there between today and a future date?
- What week number of the year is a certain date in?
- Does a certain date fall on a weekday or weekend?
How to use it
- Click the date field and choose or type any date - past or future.
- Click "Find the day."
- Read the weekday, how many days away it is from today, its ISO week number, and whether it falls on a weekday or weekend.
Tips
- Use this to double check the weekday of important dates like anniversaries, deadlines, or historical events before you commit to them in writing.
- The "days from today" figure is useful for countdown planning - just enter your target date to see exactly how far away it is.
- ISO week numbers (used on this tool) start the week on Monday and are common in business, scheduling, and international contexts - they can differ from calendars that start the week on Sunday.
Frequently asked questions
Is this day of the week calculator free to use?
Yes. It is completely free, works in your browser, and does not require any sign-up or download.
Can I check the day of the week for a date far in the past?
Yes, this calculator works for a very wide range of dates using the standard Gregorian calendar. Extremely old dates, before the Gregorian calendar was adopted in a given country, may not match historical records exactly, since calendar systems changed over time.
What is an ISO week number?
It's a standardized way of numbering the weeks of the year, from week 1 to 52 or 53, where each week starts on a Monday. It's widely used in business and scheduling contexts internationally.
Why does the day of the week matter for a date?
Many practical decisions depend on the weekday rather than just the date - for example, whether a deadline falls on a business day, whether a recurring event lands on a weekend, or simply satisfying curiosity about a birthday or anniversary.
Does this account for time zones?
The calculator uses the date as entered, based on the calendar day itself rather than a specific time zone, since the day of the week for a calendar date doesn't change based on location.
