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Day of Week Calculator - Same Date, Every Year

See what day of the week a specific date (birthday, anniversary, etc.) falls on across multiple years. A free day-of-week calculator showing yearly changes in a table.

Select Date (Month/Day)

From Year

To Year

Day of Week by Year

Select a date and click Calculate to see the day of the week for each year.

How to Use

Easily check what day of the week a specific date falls on across multiple years.

1. Select the month and day you want to check using the date picker.
2. Set the start and end years to define the range.
3. Click the 'Calculate' button to see the day-of-week table by year.
4. The current year is highlighted in blue, and today's date is highlighted in yellow.

What is a Yearly Day of Week Calculator?

The yearly day of week calculator shows what day of the week the same month/day falls on across multiple years at a glance. For example, you can see what day June 15th falls on every year from 2020 to 2030. It's useful for planning birthday parties, checking anniversary schedules, and planning holiday vacations.

Use Cases

Check what day your birthday falls on for the next several years, find years when your anniversary falls on a weekend, plan Christmas or New Year holidays, organize events for specific weekdays, and verify past anniversary dates.

※ Notice

Calculations based on the Gregorian calendar from 1583 onwards.
If February 29 is selected, non-leap years will show 'N/A'.
Saturdays are shown in blue, Sundays in red.
The current year is highlighted with a blue background.
Times displayed in Korea Standard Time (KST).

Frequently Asked Questions

How do I check the day of the week for a specific date?

Select the desired month and day in the date picker, set the start and end years, then click the Calculate button. You can see at a glance what day of the week the selected date falls on for each year in a table.

How is February 29 in a leap year handled?

If you select February 29, the date is shown only for leap years, and non-leap years are shown as 'N/A'. A leap year is divisible by 4, except for years divisible by 100, which are not leap years unless also divisible by 400.

Can I look up both past and future years?

Yes, you can freely look up any year from 1583 to 9999. You can check what day past anniversaries fell on, or find out in advance what day of the week a future birthday or wedding anniversary will be.

When is the day-of-week calculator useful?

It's useful when checking which years an upcoming birthday or anniversary falls on a weekend. It also helps you quickly find years when a desired day of the week occurs for scheduling events or gatherings.

How Day-of-Week Calculation Works and the History of the Calendar

Day-of-week calculation is based on the Gregorian calendar and mathematically determines which day of the week a specific date falls on. The 7-day cycle is the foundation of modern scheduling.

The Gregorian Calendar and Day-of-Week Calculation

The Gregorian calendar, now used worldwide, was introduced in 1582 as a reform of the Julian calendar. This calculator accurately computes dates from 1583 onward using the Gregorian system, including precise handling of leap year rules.

Practical Uses of Day-of-Week Calculation

Knowing which day of the week a birthday, anniversary, or holiday falls on in a given year makes planning events much easier. You can identify years when dates fall on weekends or long holidays to optimize travel or gathering schedules.

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