Day of the Week Calculator | Find Day from Any Date

Use this Day of the Week Calculator to find which day of the week falls on any date. Simply enter a date to find whether it was a Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday.

You can use the calculator for dates in the past, present, or future. It is also useful for finding what day you were born, checking what day a particular historical date occurred on, or finding the weekday for an upcoming date.

The calculator also shows the day of the year, ISO week number, whether the date is a weekday or weekend, and whether the year is a leap year.

What Day Was It?

Have you ever wondered what day a particular date was?

Enter the date into the calculator above and it will instantly tell you the day of the week.

For example:

You can use the calculator for almost any valid date and find the corresponding weekday.

For example, if you want to know:

What day was 15 August 1947?

Enter 15 August 1947, and the calculator gives:

Friday

What Day Was I Born?

One of the easiest ways to use this calculator is to find the day of the week you were born.

Simply enter your date of birth and click Find Day.

For example, if your date of birth is 16 September 1995, the calculator will show:

Saturday

You can use the same method to find the day of the week for the birth date of a family member, friend, or anyone else.

How to find the day you were born

1. Enter your date of birth.
2. Click Find Day.
3. The calculator will show the day of the week.
4. You can also see additional information about your birth date, including its day of the year and week number.

There is no need to manually calculate the weekday.

Find the Day of the Week from a Date

Finding the day of the week from a date is simple with this calculator.

For example:

Date: 4 July 2025
Day: Friday

The process works for:

• Past dates
• Today’s date
• Future dates
• Birth dates
• Historical dates
• Anniversaries
• Important events
• Holidays
• Any other valid calendar date

If you already know the date, simply enter it into the calculator to find its corresponding day.

What Information Does the Calculator Show?

Our calculator provides more than just the weekday.

Day of the Week

This is the main result. It tells you whether the selected date falls on Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, or Saturday.

Day of the Year

The calculator also tells you the position of the date within the year.

For example, January 1 is day 1, while December 31 can be day 365 or 366, depending on whether it is a leap year.

Week Number

The calculator displays the ISO week number for the selected date.

This can be useful when working with schedules, calendars, projects, or dates that are organized by week.

Weekday or Weekend

The calculator identifies whether the selected date is a:

• Weekday
• Weekend

Saturday and Sunday are classified as weekends.

Leap Year

The calculator also tells you whether the selected year is a leap year.

A leap year normally occurs every four years, with special rules for century years.

How to Find the Day of the Week from a Date

There are two simple ways to find the day of the week.

Method 1: Use the Calculator

The easiest method is to enter the date into our calculator.

For example:

Date → Day

1 January 2000 → Saturday

This is useful when you need an answer quickly and don’t want to perform a manual calculation.

Method 2: Calculate It Manually

There are mathematical methods for determining the weekday of a date. One commonly known method is Zeller’s Congruence, which uses the year, month, and day as inputs to calculate the corresponding weekday.

Another approach is the Doomsday algorithm, which allows the weekday of many dates to be calculated mentally after learning a set of reference dates.

For everyday use, however, a date calculator is much faster and reduces the possibility of arithmetic errors.

What Day Is Today?

If you simply want to know what day it is today, you can click the Use Today button in the calculator.

The calculator automatically selects the current date and calculates its day of the week.

This is also useful if you want to check today’s:

• Day of the week
• Day of the year
• Week number
• Weekday/weekend status
• Leap-year status

Examples of Finding a Day from a Date

Here are some examples you can check with the calculator:

These examples demonstrate that the calculator can be used for both historical and future dates.

Frequently Asked Questions