Description
Return a calendar half-year label.
Date labels and intervals depend on origins, endpoint inclusion and calendar versus elapsed-time conventions. Numeric serial periods and local token formats can represent useful bookkeeping without resolving a real instant or official fiscal rule.
Return a calendar half-year label.
When to use this tool
Use Calendar Semi Year Period Index when checking a supplied date-label, duration or interval convention.
How to use the tool and how it works
- Enter year, month. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read half, periodKey. Use the output convention below.
Return a calendar half-year label. Require year 1-9999 and month 1-12; half is one through June, otherwise two, and periodKey combines year with H1/H2.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| year | Year | Required. Safe integer; minimum 1; maximum 9999. |
| month | Month | Required. Safe integer; minimum 1; maximum 12. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| half | Half | Required. Safe integer. |
| periodKey | Period Key | Required. Text; maximum UTF-16 length 8192. |
{
"input": {
"year": 2026,
"month": 6
},
"output": {
"half": 1,
"periodKey": "2026-H1"
}
}Limitations and assumptions
- This is calendar grouping, not a fiscal half-year or date-validity check beyond the supplied components.
- 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
Use a complete date/time implementation and the applicable calendar policy for actual scheduling and interval interpretation.
References
Similar or alternative tools
- Calendar Decade Explicit Origin Index
Return a decade index relative to a supplied year origin.
- Fiscal Period Label Explicit Start Month
Return fiscal start year and period from an explicit start month.