Day of the Week Calculator

Find the day of the week for a date and its day difference from today.

Category: Date & Time

When to use?

Use it to find what day of the week a date falls on, or to see how far away the next Friday is. It also calculates past dates, useful for checking historical days.

How to use

  • Enter a date.
  • The day of the week and the day difference from today are shown.

Input Explanation

Enter the specific date you want to check.

Calculation Basis

The date is converted to a Date object and returns the weekday (Sunday–Saturday) in the local time zone.

Usage Examples

  • Check a date's weekday - Instantly find what day of the week a date falls on.
  • Days to the next weekday - Calculate how many days remain until the next Friday.
  • Check an anniversary's weekday - See what day of the week a birthday or anniversary falls on this year.

Examples

  • 2025-05-12 → Monday
  • 2000-01-01 → Saturday

Cautions

  • Days of the week may be incorrect for historical dates before the Gregorian calendar was adopted.
  • Weekdays for pre-Gregorian dates or those converted from a lunar calendar may differ from reality due to calendar-system differences.

Guides

How the weekday is found

The weekday is determined by the remainder of the date divided by 7. It uses the local calendar date, so the weekday is accurate regardless of time zone.

Calendar lookups

Useful for checking what day a past date was, or the weekday of a future plan in advance.

FAQ

Can it check past dates?

Yes, it calculates the weekday for any date.

Can it check future dates?

Yes. It calculates the weekday for any date, past or future.

How is the weekday calculated?

It uses the browser's date functions to accurately determine the real weekday of the entered date.

Does it show the day difference from today?

Yes, it shows how many days the date is from today.

Related Tools

  • Date Difference Calculator - Calculate the number of days between two dates, or the date N days from a reference date.
  • D-Day Calculator - Show the days remaining until, or elapsed since, a target date based on today.
  • Age Calculator - Calculate your exact age, this year's birthday status, and days until your next birthday.
  • Time Calculator - Add or subtract time from a clock time, and calculate the interval between two times.
  • Timestamp Converter - Convert Unix timestamps to readable dates and dates back to Unix timestamps.
  • Months Between Dates Calculator - Calculate total months, days, and a year/month/day breakdown between two dates.