Description
Measure a birth date's signed distance from a supplied school-entry cutoff date.
Developmental research records separate actual observations, coder presence, task versions, response states, caregiver reports and exposure counts. Calendar age differs from developmental status, while a symbol match or parent-teacher rating gap is only a recorded comparison. Pseudonyms and supplied source labels do not themselves protect identity or validate evidence.
Measure a birth date's signed distance from a supplied school-entry cutoff date.
When to use this tool
Use School Entry Cutoff Date Distance when you already have suppliedCutoffDate, birthDate and need to measure a birth date's signed distance from a supplied school-entry cutoff date.
How to use the tool and how it works
- Enter suppliedCutoffDate, birthDate. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read signedCalendarDays. Use the output convention below.
Parse real UTC YYYY-MM-DD dates; return birthDate-cutoffDate in calendar days.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| suppliedCutoffDate | Supplied Cutoff Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| birthDate | Birth Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| signedCalendarDays | Birth date-cutoff date; positive means born after the supplied cutoff, not automatically ineligible. | Required. Safe integer. |
{
"input": {
"suppliedCutoffDate": "2026-10-28",
"birthDate": "2026-11-01"
},
"output": {
"signedCalendarDays": 4
}
}Limitations and assumptions
- Positive means birth after the supplied cutoff. No entry-age rule, legal eligibility, school assignment or developmental readiness is determined.
- 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.
Alternative or Complementary methods
Use the complete study or assessment method, observation records and context for developmental interpretation. Review task adaptations, reporter perspectives and data protection together; local counts, time gaps and status labels do not establish ability, diagnosis or suitable support.
References
Similar or alternative tools
- Child Age Testing Date Offset
Calculate recorded age in elapsed calendar days on a testing date.
- Retirement Age Cohort Date
Calculate a supplied retirement-age cohort year and month.