Description
Return secondStart-minus-firstEnd and overlap when that difference is negative.
Historical records can use uncertain dates, different calendars and incomplete jurisdiction periods. Signed endpoint differences describe supplied coordinates; they do not perform a historical-calendar conversion or establish the actual period's authority.
Return secondStart-minus-firstEnd and overlap when that difference is negative.
When to use this tool
Use Historic Jurisdiction Interval Gap when you need a supplied historical-date or interval comparison.
How to use the tool and how it works
- Enter firstEnd, secondStart. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read gap, overlap. Inspect overlap before interpreting the associated values.
Return secondStart-minus-firstEnd and overlap when that difference is negative.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| firstEnd | First End | Required. Finite number. |
| secondStart | Second Start | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| gap | Difference on the stated unit and subtraction basis. | Required. Finite number. |
| overlap | Overlap | Required. Boolean. |
{
"input": {
"firstEnd": 1800,
"secondStart": 1810
},
"output": {
"gap": 10,
"overlap": false
}
}Limitations and assumptions
- Only these two endpoints are compared: no complete period bounds or endpoint-inclusion convention is validated, and equality is not overlap under this rule.
- 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
Resolve the source calendar, date precision and jurisdictional context before comparison. Use a dedicated historical chronology method when calendar conversion or legal interpretation is needed.
References
Similar or alternative tools
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