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Determines date using a sliding window #3

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Determines date using a sliding window #3

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30 changes: 23 additions & 7 deletions src/BarcodeParser.js
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Original file line number Diff line number Diff line change
Expand Up @@ -181,9 +181,14 @@ const parseBarcode = (function () {
yearAsNumber = 0,
monthAsNumber = 0,
dayAsNumber = 0;
var currentCCYY = new Date().getUTCFullYear(),
currentYear = currentCCYY % 100,
currentCentury = currentCCYY - currentYear,
yearGap = 0;

try {
yearAsNumber = parseInt(dateYYMMDD.slice(0, 2), 10);
yearGap = yearAsNumber - currentYear;
} catch (e33) {
throw "33";
}
Expand All @@ -199,14 +204,25 @@ const parseBarcode = (function () {
} catch (e35) {
throw "35";
}
// we are in the 21st century, but section 7.12 of the specification
// states that years 51-99 should be considered to belong to the
// 20th century:
if (yearAsNumber > 50) {
yearAsNumber = yearAsNumber + 1900;
// Year determination
// use a sliding window going from -49 years to +50 years
// as specified in section 7.1.2. (see: https://ref.gs1.org/standards/genspecs/)
//
// 2024 2074
// ----------------|------------]------->
//
// In 2024, the horizon for 21th century is 2074.
//
// Example:
// If 2-digits year is 78, it is supposed to be 1978 (closer to 2024 than 2078)
//
if (yearGap >= 51) {
yearAsNumber = yearAsNumber + currentCentury - 100;
} else if (yearGap <= -50) {
yearAsNumber = yearAsNumber + currentCentury + 100;
} else {
yearAsNumber = yearAsNumber + 2000;
}
yearAsNumber = yearAsNumber + currentCentury;
}

if (dayAsNumber > 0) {
// Dates in Javascript are funny. Months start at 0. Days, on the other
Expand Down