Year Calendar
Leap flag, weekday of 1 January, ISO week count, and a 12-month table of lengths and start weekdays.
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How to use Year Calendar
- Enter year. Leave a field blank only when the page says the value is missing, not by typing 0 unless 0 is a real value.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Rounding follows IEEE floating point in this browser unless the page says it uses integers or BigInt.
Year Calendar
Leap year
| Computes | Leap flag, weekday of 1 January, ISO week count, and a 12-month table of lengths and start weekdays. |
|---|---|
| Includes | Leap year |
| Includes | Month table |
| Includes | ISO week count |
| Engine | dateDiff |
| Upload | None |
| Advice | Arithmetic only |
What Year Calendar is
Gregorian leap years. ISO weeks in a year are 52 or 53. The table lists how many days each month has and which weekday it starts on.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
A single date's weekday is day of week. This is not a printable wall calendar with holidays filled in.
Entities and related jobs
Leap flag, weekday of 1 January, ISO week count, and a 12-month table of lengths and start weekdays. Named features: Leap year, Month table, ISO week count.
See also Day of Week Calculator, Week Number Calculator, Add or Subtract Days, Date Difference Calculator, Age Calculator, Business Days Calculator.
Use cases
Planning a year view without loading a locale holiday pack.
Limits
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.