Solverly

Day of Week Finder

Instantly see which weekday a specific date falls on—past or future—without flipping through calendars. It’s handy for planning meetings and events, checking due dates, booking travel, confirming payroll runs, remembering anniversaries, or verifying historical dates.

The Day of Week Finder lets you pick any date and get the exact day name right away, eliminating guesswork and manual counting. Use it to coordinate schedules, set reminders with confidence, and communicate timelines clearly—so you can plan around Mondays, Fridays, or weekends with zero friction. Enter a date below to get started.

Enter any date to see its weekday, ISO week number, and nearby holidays — past or future.

Enter date

Example: 09-03-2025

Use negative numbers to go backward.

Enter a valid date in MM-DD-YYYY.

Summary

Adjusted date
—
Weekday
—
ISO week
—
Nearest U.S. holiday
—

ISO weeks start on Monday. Week 01 is the first week with a Thursday in the new year.

We built our page to answer a simple question fast: what day of the week falls on a given date? We also show the ISO week number and the nearest U.S. holiday. Add or subtract days to plan deadlines, countbacks, or reminders.

Results interpretation

  • Weekday name: Clear label for scheduling, reminders, or travel planning.
  • ISO week: Useful for teams that schedule by week numbers (W01–W52/53).
  • Nearest U.S. holiday: A quick heads-up for potential closures or travel peaks.

How it works

We parse your date in MM-DD-YYYY, apply the day offset, then compute the weekday and ISO week using standard rules.

Formulas, steps, assumptions, limitations

Adjusted date: adjusted = base ⊕ offset_days (add/subtract days).

Weekday: Determined from the adjusted date via the Gregorian calendar.

ISO week number: Weeks start Monday; Week 01 is the week containing January’s first Thursday.

Nearest holiday: We compare the adjusted date to common U.S. federal holidays in the adjacent years and report the closest by absolute day difference.

Limits: Historical adoption of the Gregorian calendar varies by country; pre-1900 dates can differ from local records.

Use cases & examples

Project milestones

Pick a target date and add or subtract days to land milestones on business days.

Travel & events

Check if a date falls near a federal holiday that could affect traffic or prices.

Academic schedules

Convert assignment dates into weekdays and ISO weeks for syllabus planning.

FAQ: Day of week & ISO week

How do we enter the date format?
Use MM-DD-YYYY (e.g., 09-03-2025). Leading zeros are optional.
What is an ISO week number?
ISO weeks start on Monday. Week 1 is the week that contains the year’s first Thursday.
Can we add or subtract days from a date?
Yes. Enter a positive number to move forward or a negative number to move backward.
Do we support dates far in the past or future?
Yes—Gregorian calendar dates are supported across wide ranges. Pre-1900 conventions may vary by country.
Which holidays do we check for proximity?
We compare against common U.S. federal holidays and report the closest one.
Why might week numbers differ from a wall calendar?
Some calendars don’t use ISO rules. We use ISO-8601 for consistency across regions.

How to find the day of the week for any date

Enter a date in MM-DD-YYYY, optionally add or subtract days, then read the weekday, ISO week number, and nearest U.S. holiday.

  1. Enter a date in MM-DD-YYYY (e.g., 09-03-2025).
  2. Optionally enter a +/− days offset to jump forward or back.
  3. Review the weekday name and ISO week number.
  4. Check the nearest U.S. holiday and its distance in days.
Tools
  • Calendar (optional)
  • Our Copy link button for sharing inputs
Tips
  • Use negative offsets for countbacks (e.g., −7 for “a week earlier”).
  • Pair with Business Days to skip weekends and holidays.

Understanding weekday names, ISO weeks, and planning offsets

We rely on weekday names to coordinate meetings, shipping windows, academic milestones, and personal plans. Pairing that label with an ISO week number helps teams align across countries and software systems that use week-based schedules. When we add a day offset, we’re answering a practical question: “What’s the date if we shift by a certain number of days?”

Why ISO weeks matter

ISO-8601 standardizes how weeks are counted so Monday is the first day and Week 01 is defined consistently. This avoids confusion when different calendars treat partial weeks at the year boundary differently.

Holiday proximity for planning

Seeing the nearest federal holiday helps anticipate office closures, peak travel, and shipping delays. For complex schedules, combine our result with Business Days to skip weekends and recognized holidays.

Edge cases to know

Historical calendar reforms can affect very old dates. For modern planning, the ISO approach is reliable and consistent across regions and software.