Two-Digit Year Century Window Rule Lookup
Resolve a two-digit year into a caller-specified inclusive 100-year window, returning the unique year with matching final digits; no operating-system date setting is assumed.
Description
Two-digit years need a century interpretation policy.
Two-digit years need a century interpretation policy. A supplied 100-year window gives exactly one matching final-digit year.1
Resolve a two-digit year into a caller-specified inclusive 100-year window, returning the unique year with matching final digits; no operating-system date setting is assumed.
When to use Two-Digit Year Century Window Rule Lookup
Use this for the following task: Resolve a two-digit year into a caller-specified inclusive 100-year window, returning the unique year with matching final digits; no operating-system date setting is assumed.
Prepare the CSV text, decoded cells or byte values requested below. Choose delimiter and header flags explicitly when those fields are present.
How to use Two-Digit Year Century Window Rule Lookup and understand its results
- Prepare the CSV text, decoded cells or byte values requested below. Choose delimiter and header flags explicitly when those fields are present.
- Enter twoDigitYear, windowStartYear using the field table, then run the tool.
- Read year. Interpret flags, units, ordering and placeholder values using the rules below.
- Review any reported issue or failed check, correct the supplied values when appropriate, and verify the result in its intended context.
| Input field | Meaning | Value type and bounds | Requirement |
|---|---|---|---|
| twoDigitYear | Two digit year | integer; minimum 0; maximum 99 | Required |
| windowStartYear | Window start year | integer; minimum 1; maximum 9900 | Required |
Supply a supported two-digit value and window start. Start in the window’s century and add 100 when the result precedes the window start.2
year lies in [windowStart,windowStart+99] and year mod 100 = twoDigitYear This summarizes the declared operation. Units, indexing, inclusivity and exceptional cases are explained in the surrounding text.
| Output field | Meaning | Value type |
|---|---|---|
| year | Year | integer |
{
"input": {
"twoDigitYear": 29,
"windowStartYear": 1930
},
"output": {
"year": 2029
}
}Limitations and assumptions
No operating-system or spreadsheet date setting is inferred. This does not parse full dates.
Supply the decoded cell strings or raw values declared by the input fields; this tool does not load a spreadsheet file. Malformed requests produce input errors. A successfully evaluated request can still contain false flags, empty result lists or a result outside the supplied threshold; those outcomes have the meanings stated above.
Alternative or Complementary methods
Choose Unix Timestamp Column to ISO Datetime for this operation: Convert integer Unix timestamp cells in explicit seconds or milliseconds to UTC ISO datetimes with millisecond precision, limited to years 0001 through 9999. For a complementary task, use Scientific-Notation Gene-Name Date Guard for this operation: Flag legacy MARCH#, MARC1/2, SEPT#, or DEC1 symbols and ASCII scientific-notation-shaped cells as spreadsheet import risks; the rule is a heuristic, not a gene registry lookup.
Further background: Format and language reference: Two-Digit Year Century Window Rule Lookup.
References
Similar or alternative tools
- Unix Timestamp Column to ISO Datetime
Convert integer Unix timestamp cells in explicit seconds or milliseconds to UTC ISO datetimes with millisecond precision, limited to years 0001 through 9999.
- Scientific-Notation Gene-Name Date Guard
Flag legacy MARCH#, MARC1/2, SEPT#, or DEC1 symbols and ASCII scientific-notation-shaped cells as spreadsheet import risks; the rule is a heuristic, not a gene registry lookup.