Description
Inspect known components in a restricted partial-date spelling.
Timestamp notation distinguishes written precision, quantization and carry into the next larger field. Padding a fraction, rounding it and propagating an end-of-day marker are different operations and do not establish clock accuracy.
Inspect known components in a restricted partial-date spelling.
When to use this tool
Use ISO 8601 Unknown Component Mask when checking one explicit timestamp precision, rounding or carry convention.
How to use the tool and how it works
- Enter date. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read yearKnown, monthKnown, dayKnown. Inspect yearKnown, monthKnown, dayKnown before interpreting the associated values.
Inspect known components in a restricted partial-date spelling. Accept four digits or XXXX for year and two digits or XX for month/day; return three presence flags.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| date | Restricted component-mask spelling only; numeric month/day fields are not validated as a real date. | Required. Text; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| yearKnown | Year Known | Required. Boolean. |
| monthKnown | Month Known | Required. Boolean. |
| dayKnown | Day Known | Required. Boolean. |
{
"input": {
"date": "2024-XX-XX"
},
"output": {
"yearKnown": true,
"monthKnown": false,
"dayKnown": false
}
}Limitations and assumptions
- Numeric month/day validity and real date existence are not checked; this is not complete ISO/EDTF validation.
- 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 complete date-time arithmetic when a carry must change a date or interact with timezone transitions.
References
Similar or alternative tools
- Calendar Date Component Mask
Encode supplied date-component presence into a bit mask and hierarchy flag.
- Minute Precision Interval Envelope
Return the half-open millisecond envelope of an epoch-minute coordinate.