TwoDigitYearOptions

How a two-digit year (yy in a pattern, YYMMDD in an EDI value) gets its century.

import type { TwoDigitYearOptions } from "@northguild/gmt";

Members

Member	Type	Description
`yearWindow?`	`number` \| `"rolling"`	The hundred-year window a two-digit year falls in. A number is the first year of a fixed window, an integer from 0 to 9900: `2000` reads `00`–`99` as 2000–2099; `1950` reads `50`–`99` as 1950–1999 and `00`–`49` as 2000–2049. A fixed window gives the same answer in any year, so it is the form for stored data, archives and anything re-processed later. `"rolling"` is the hundred years around today: from 50 years before the current UTC calendar year to 49 years after it (in 2026, 1976–2075). It is the form for live messages and never needs maintenance, but it gives a different answer for the same stored value as years pass. Any other value returns the function’s sentinel.

Definition

interface TwoDigitYearOptions {
  /**
   * The hundred-year window a two-digit year falls in. A number is the first year of a fixed
   * window, an integer from 0 to 9900: `2000` reads `00`–`99` as 2000–2099; `1950` reads `50`–`99`
   * as 1950–1999 and `00`–`49` as 2000–2049. A fixed window gives the same answer in any year,
   * so it is the form for stored data, archives and anything re-processed later. `"rolling"` is
   * the hundred years around today: from 50 years before the current UTC calendar year to 49
   * years after it (in 2026, 1976–2075). It is the form for live messages and never needs
   * maintenance, but it gives a different answer for the same stored value as years pass. Any
   * other value returns the function's sentinel.
   *
   * @defaultValue None. A value with a two-digit year returns the sentinel: no standard says which
   * century it belongs to, so the caller states it.
   */
  yearWindow?: "rolling" | number;
}

Used by

Source

types/two-digit-year.ts