What date range does this calculator support?

The calculator supports dates from year 100 through year 9999, covering virtually any historical or future date you need.

Is the result accurate for historical dates before 1582?

Results use the proleptic Gregorian calendar (extending the Gregorian calendar backward). For dates before October 15, 1582, historical records used the Julian calendar, so the day name may differ from what was used at the time.

Can I browse other months in the calendar?

Yes. Use the Previous and Next buttons in the calendar panel to navigate to neighboring months while keeping your selected date highlighted.

Does it account for leap years?

Yes. JavaScript's Date object correctly handles all leap years, including the century-year exceptions (e.g., year 1900 was not a leap year but 2000 was).

Does this tool send my data anywhere?

No. All calculations run entirely in your browser using JavaScript. No data is sent to any server.

Day of Week Calculator

Name: Day of Week Calculator
Availability: InStock
Author: Nham Vu

Enter any date to instantly find the day of the week and see a monthly calendar with that date highlighted.

Select a Date

Date picker

or enter manually

Month

Day

Year

Enter a date on the left to see the day of the week and calendar view.

Summary

Enter any date to instantly find the day of the week and see a monthly calendar with that date highlighted.

How it works

Enter a date using the date picker or type month, day, and year manually.
The calculator computes the day of the week using JavaScript's built-in Date object.
The result is displayed prominently with the full day name and short form.
A monthly calendar grid renders below, with the selected date highlighted.
Use the Previous and Next buttons to browse neighboring months in the calendar.

Use cases

Find out what day of the week you were born.
Plan future events by checking which day a date falls on.
Verify historical dates for research or trivia.
Schedule meetings or deadlines by browsing the monthly calendar view.
Confirm whether a holiday falls on a weekday or weekend.
Check what day a specific anniversary or birthday will land on.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu