MBS-12229: Parse Japanese letter code dates as proper year numbers

See https://reference.discogs.com/wiki/japanese-release-dates#date-format

Author: reosarevok

root/static/scripts/common/utility/parseNaturalDate.js

@@ -26,6 +26,28 @@ function cleanDateString(
     },
   );
 
+  // See https://reference.discogs.com/wiki/japanese-release-dates#date-format
+  const japaneseYearCodes = {
+    /* eslint-disable sort-keys */
+    N: '1984',
+    I: '1985',
+    H: '1986',
+    O: '1987',
+    R: '1988',
+    E: '1989',
+    C: '1990',
+    D: '1991',
+    K: '1992',
+    L: '1993',
+    /* eslint-enable sort-keys */
+  };
+  cleanedString = cleanedString.replace(
+    /([NIHORECDKL])-([0-9]{1,2}-[0-9]{1,2})/,
+    function (match, year, date) {
+      return japaneseYearCodes[year] + '-' + date;
+    },
+  );
+
   return cleanedString;
 }
 

root/static/scripts/tests/utility/parseNaturalDate.js

@@ -12,7 +12,7 @@ import test from 'tape';
 import parseNaturalDate from '../../common/utility/parseNaturalDate.js';
 
 test('parseNaturalDate', function (t) {
-  t.plan(10);
+  t.plan(12);
 
   /* eslint-disable sort-keys */
   const parseDateTests = [
@@ -42,6 +42,10 @@ test('parseNaturalDate', function (t) {
       date: '１９９９ ０１ ０２',
       expected: {year: '1999', month: '01', day: '02'},
     },
+
+    // Japanese year codes
+    {date: 'O-2-25', expected: {year: '1987', month: '2', day: '25'}},
+    {date: 'D-12-10', expected: {year: '1991', month: '12', day: '10'}},
   ];
   /* eslint-enable sort-keys */