Description
Measure the signed calendar margin to an instrument's recorded validity date.
Laboratory study records track plans, test items, specimens, amendments, personnel and archived source data. A metadata tuple can preserve a link without authenticating the record or establishing compliance. An instrument date margin is distinct from demonstrated calibration and fitness for use.
Measure the signed calendar margin to an instrument's recorded validity date.
When to use this tool
Use GLP Instrument Validity Date when checking the stated laboratory-study record or validity-date convention.
How to use the tool and how it works
- Enter asOfDate, recordedValidityEndDate. 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 YYYY-MM-DD recorded-validity-end/as-of dates at UTC midnight. Return end-minus-as-of calendar days, retaining negative values.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| asOfDate | Real YYYY-MM-DD date under the UTC calendar convention specified above. | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| recordedValidityEndDate | Recorded Validity End 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 | Recorded instrument-validity end minus as-of date; no implied end-date inclusion policy. | Required. Finite number. |
{
"input": {
"asOfDate": "2026-10-28",
"recordedValidityEndDate": "2026-11-01"
},
"output": {
"signedCalendarDays": 4
}
}Limitations and assumptions
- No calibration record, instrument performance, end-date inclusion rule or authorization to use equipment 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 verified controlled study records and the applicable complete laboratory quality requirements with qualified responsible personnel for actual decisions.
References
Similar or alternative tools
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