Perpetual Calendar
Last updated: 2026-06-25
A perpetual calendar lets you pick any year and month to view the days of the week and dates for any past or future month, with public holidays and today's date marked.
The week starts on Sunday, and for 2024-2035 statutory and substitute holidays are highlighted in red.
Select Year & Month
June 2026
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|
Holiday marking is accurate for 2024-2035, which have lunar data. Temporary holidays are excluded; for exact holidays, check the Ministry of the Interior and Safety. (For reference)
How to Use
- Enter a year — Type the year you want to view.
- Select a month — Choose a month from January to December.
- View the calendar — Click [View Calendar] to show holidays and today's date. You can also move with the previous/next month buttons.
What Is a Perpetual Calendar?
A perpetual calendar (萬年曆) is not limited to a single year; it calculates and shows the day of the week and dates for any year and month. By applying the Gregorian leap-year rules (a year divisible by 4 is a leap year, divisible by 100 is not, but divisible by 400 is again), it produces the correct day of the week for any month. It is useful for finding the day of the week of a past birthday, or checking the day of a future event in advance.
| Marking | Meaning |
|---|---|
| Red date | Sunday or public holiday |
| Blue date | Saturday |
| Red text under a date | Holiday name (statutory / substitute) |
| Bordered cell | Today's date |
This perpetual calendar starts the week on Sunday and computes holidays with the same rules as the public holidays calculator. If you want to check lunar holidays such as Seollal and Chuseok, try the lunar date converter as well.
Frequently Asked Questions (FAQ)
What is a perpetual calendar?
A perpetual calendar is not tied to a single year; it calculates and shows the day of the week and dates for any year and month. It is handy for checking the day of the week of a past birthday or a future event in advance.
Are holidays shown too?
Yes. For 2024-2035, statutory and substitute holidays such as New Year's Day, Seollal, and Chuseok are shown in red beneath the date. Lunar holidays are computed from a lookup table based on Korea Astronomy and Space Science Institute lunisolar data.
Which day does the week start on?
This perpetual calendar starts the week on Sunday. Sundays are highlighted in red and Saturdays in blue, and today's date is shown with a border.
What year range is supported?
The calendar (days of the week and dates) can be shown for any year. However, holiday marking is accurate only for 2024-2035, which require lunar data; for other years, only solar-fixed holidays are mainly shown.
Related Tools & Guides
Last updated: 2026-06-25