Description
Compare supplied civil-date research age with an explicit day anchor; no age-category or care rule.
Pediatric research records use chronological age, visit windows, measurement resolution, task observations, and caregiver reports. Missing observation differs from noncompletion, and a completeness share depends on its denominator. Arithmetic on supplied records is separate from a developmental or clinical assessment.
Compare supplied civil-date research age with an explicit day anchor; no age-category or care rule.
When to use this tool
Use Research Age Anchor Gap when you need this age, observation, visit, measurement, or record-completeness calculation with supplied inputs.
How to use the tool and how it works
- Enter birthDate, eventDate, suppliedAnchorDays. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read ageDays, anchorGapDays. Use the output convention below.
Parse birthDate and eventDate as real YYYY-MM-DD calendar dates. Return ageDays as their signed UTC day difference and anchorGapDays=ageDays-suppliedAnchorDays for a nonnegative integer anchor.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| birthDate | Birth Date | Required. Text; maximum UTF-16 length 8192. |
| eventDate | Event Date | Required. Text; maximum UTF-16 length 8192. |
| suppliedAnchorDays | Supplied Anchor Days | Required. Safe integer; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| ageDays | Signed chronological UTC day difference; may be negative. | Required. Safe integer. |
| anchorGapDays | Anchor Gap Days | Required. Safe integer. |
{
"input": {
"birthDate": "2024-02-28",
"eventDate": "2024-03-01",
"suppliedAnchorDays": 1
},
"output": {
"ageDays": 2,
"anchorGapDays": 1
}
}Limitations and assumptions
- An event before birth is accepted and yields a negative age. This is chronological day arithmetic, not corrected gestational age, developmental assessment, or a clinical age-range decision.
- 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. Signed zero is exported as zero.
Alternative or Complementary methods
Use verified dates, measurement protocols, and observation definitions for the intended research question. A clinical interpretation needs the relevant age-specific assessment and context beyond the arithmetic record check.
References
Similar or alternative tools
- Child Age Calendar Partial Interval
Propagate supplied absolute calendar-day birth bounds without approximating months or developmental age.
- Pediatric Research Followup Age Window Gap
For nonnegative integer ageAtBaselineDays and elapsedDays and ordered nonnegative minimumAgeDays and maximumAgeDays return ageAtVisitDays=baseline+elapsed, minimumMargin=age-minimum, maximumMargin=maximum-age, and inside on both inclusive bounds.