Description
Require bounded integer year and intercalaryYears, then return exact membership of year in the supplied list.
Calendar coordinates depend on an era, origin, day-start rule, and sometimes an arithmetic rather than observational convention. A supplied coordinate difference does not resolve those choices.
Require bounded integer year and intercalaryYears, then return exact membership of year in the supplied list.
When to use this tool
Use Public Calendar Intercalation Flag when you need a documented calendar convention or source-coordinate comparison.
How to use the tool and how it works
- Enter year, intercalaryYears. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read intercalary. Inspect intercalary before interpreting the associated values.
Require bounded integer year and intercalaryYears, then return exact membership of year in the supplied list.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| year | Year under the stated calendar and supported numeric bounds. | Required. Safe integer; minimum -100000; maximum 100000. |
| intercalaryYears | Intercalary Years | Required. Array of safe integer; maximum items 256. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| intercalary | Intercalary | Required. Boolean. |
{
"input": {
"year": 2026,
"intercalaryYears": [
2024,
2026,
2029
]
},
"output": {
"intercalary": true
}
}Limitations and assumptions
- This does not calculate leap rules, astronomical intercalation, or the correct year list for any calendar tradition.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Consult the source calendar and authoritative date information for actual observance, conversion, or historical dating.
References
Similar or alternative tools
- Japanese Era Year Gannen Token
Format the first year with 元年 and later years as the number followed by 年.
- European Charter Indiction Source Token
Require indiction from one through 15 and nonempty sourceId, then format indiction number [sourceId].