Calendar Generator
How to use calendar generator
- Choose the calendar date or year to inspect.
- Read the weekday, ordinal day and leap-year status.
- Keep the ISO week number together with its week-year.
- Use the calendar layout or print the selected month.
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
How the result is calculated
The calculator validates the required dates, units and range before producing a result. Keep the inputs and the selected convention with the output so another person can reproduce it.
Read all calculation conventionsHow to read your result
Keep the inputs and conventions beside the answer. These values explain what the result measures.
| Result field | Meaning |
|---|---|
| Ordinal day | A one-based count from January 1 in the selected calendar year. |
| ISO week and week-year | A complete Monday-to-Sunday week label; its year can differ near New Year. |
| Weekday totals | Monday-to-Friday dates and Saturday/Sunday dates without public holiday exclusions. |
New Year can belong to the previous ISO week-year
January 1, 2027 is day 1 of calendar year 2027 but belongs to ISO week 53 of week-year 2026.
Try the example in the calculator above. Change one input at a time and compare the target, interval and selected rules. For a longer explanation read Reading a Year Calendar: Leap Days, Weekdays and ISO Weeks.
Conventions to keep with your result
Weekday totals exclude Saturdays and Sundays but do not automatically exclude public holidays. Gregorian rules are applied consistently rather than reconstructing historical local calendar transitions.
Calendar Generator: frequently asked questions
Does every year contain 365 days?
A Gregorian leap year contains 366 days.
Why can the ISO week-year differ?
ISO weeks are complete Monday-to-Sunday periods. Week 1 contains January 4.
Can distant future years be selected?
Four-digit Gregorian years from 0001 through 9999 are supported. External holiday sources can have a narrower published range.
Learn the method
All guidesISO Week Numbers: Week 1, Week-Years and 53-Week Years
Find the ISO week-year near New Year and understand why January dates can belong to the preceding week-year.
How Dates Stay Current Every Year: Recurrences and Rollover
Understand how annual date rules keep calendars and countdowns current beyond a stored year.
Easter and Movable Holidays: Why the Date Changes Each Year
Understand Western Easter, its related dates and the limits of predicting local lunar observances.
Reading a Year Calendar: Leap Days, Weekdays and ISO Weeks
Inspect any supported Gregorian year and separate day totals from week numbering and holiday coverage.
Keep exploring
View the tool libraryDays Between Dates
Compare two dates with calendar days, complete weeks and weekday counts. Choose whether to include the end date.
Business Days Calculator
Count working days using your weekend pattern and optional excluded dates. Public holidays are excluded only when entered.
Day of the Week
Inspect a Gregorian date, leap-year rules, ISO week numbers and a printable month calendar.
Time Zone Converter
Convert an exact UTC instant to another IANA time zone.