Description
Subtract earliestYear from latestYear and add one when inclusive is true.
Archival records often contain bounded dates, editions, and source identifiers. Arithmetic on supplied coordinates can check consistency while leaving historical interpretation and authenticity unresolved.
Subtract earliestYear from latestYear and add one when inclusive is true.
When to use this tool
Use Public Museum Object Date Width when you need a precise date-span or source-record bookkeeping step.
How to use the tool and how it works
- Enter earliestYear, latestYear, inclusive. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read spanYears. Use the output convention below.
Subtract earliestYear from latestYear and add one when inclusive is true.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| earliestYear | Earliest Year | Required. Safe integer. |
| latestYear | Latest Year | Required. Safe integer. |
| inclusive | Inclusive | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| spanYears | Span Years | Required. Safe integer. |
{
"input": {
"earliestYear": 1900,
"latestYear": 1910,
"inclusive": true
},
"output": {
"spanYears": 11
}
}Limitations and assumptions
- The formula uses supplied numeric years; historical calendar transitions and the absence of a year zero are not handled.
- 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 original catalog and documented calendar or dating convention when historical interpretation matters.
References
Similar or alternative tools
- Public Era Date Precision Width
Subtract earliestCoordinate from latestCoordinate and add positive quantum only when endpointsInclusive is true.
- Public Archive Unit Date Overlap
Return max(0, min(end values) - max(start values)).