fix(datetime): correct year is set in wheel picker (#25896)

resolves #25895

core/src/components/datetime/datetime.tsx

@@ -1415,7 +1415,6 @@ export class Datetime implements ComponentInterface {
 
     const result = getCombinedDateColumnData(
       locale,
-      workingParts,
       todayParts,
       min,
       max,

core/src/components/datetime/test/data.spec.ts

@@ -1,4 +1,4 @@
-import { generateMonths, getDaysOfWeek, generateTime, getToday } from '../utils/data';
+import { generateMonths, getDaysOfWeek, generateTime, getToday, getCombinedDateColumnData } from '../utils/data';
 
 describe('generateMonths()', () => {
   it('should generate correct month data', () => {
@@ -342,3 +342,25 @@ describe('getToday', () => {
     expect(res).toEqual('2022-02-21T18:30:00.000Z');
   });
 });
+
+describe('getCombinedDateColumnData', () => {
+  it('should return correct data with dates across years', () => {
+    const { parts, items } = getCombinedDateColumnData(
+      'en-US',
+      { day: 1, month: 1, year: 2021 },
+      { day: 31, month: 12, year: 2020 },
+      { day: 2, month: 1, year: 2021 }
+    );
+
+    expect(parts).toEqual([
+      { month: 12, year: 2020, day: 31 },
+      { month: 1, year: 2021, day: 1 },
+      { month: 1, year: 2021, day: 2 },
+    ]);
+    expect(items).toEqual([
+      { text: 'Thu, Dec 31', value: '2020-12-31' },
+      { text: 'Today', value: '2021-1-1' },
+      { text: 'Sat, Jan 2', value: '2021-1-2' },
+    ]);
+  });
+});

core/src/components/datetime/test/prefer-wheel/datetime.e2e.ts

@@ -251,7 +251,7 @@ test.describe('datetime: prefer wheel', () => {
 
       const dateValues = page.locator('.date-column .picker-item:not(.picker-item-empty)');
 
-      expect(await dateValues.count()).toBe(427);
+      expect(await dateValues.count()).toBe(397);
     });
   });
   test.describe('datetime: time-date wheel rendering', () => {
@@ -356,7 +356,7 @@ test.describe('datetime: prefer wheel', () => {
 
       const dateValues = page.locator('.date-column .picker-item:not(.picker-item-empty)');
 
-      expect(await dateValues.count()).toBe(427);
+      expect(await dateValues.count()).toBe(397);
     });
   });
 });

core/src/components/datetime/utils/data.ts

@@ -441,7 +441,6 @@ const getAllMonthsInRange = (currentParts: DatetimeParts, maxParts: DatetimePart
  */
 export const getCombinedDateColumnData = (
   locale: string,
-  refParts: DatetimeParts,
   todayParts: DatetimeParts,
   minParts: DatetimeParts,
   maxParts: DatetimeParts,
@@ -473,7 +472,7 @@ export const getCombinedDateColumnData = (
    * of work as the text.
    */
   months.forEach((monthObject) => {
-    const referenceMonth = { month: monthObject.month, day: null, year: refParts.year };
+    const referenceMonth = { month: monthObject.month, day: null, year: monthObject.year };
     const monthDays = getDayColumnData(locale, referenceMonth, minParts, maxParts, dayValues, {
       month: 'short',
       day: 'numeric',
@@ -492,7 +491,7 @@ export const getCombinedDateColumnData = (
        */
       dateColumnItems.push({
         text: isToday ? getTodayLabel(locale) : dayObject.text,
-        value: `${refParts.year}-${monthObject.month}-${dayObject.value}`,
+        value: `${referenceMonth.year}-${referenceMonth.month}-${dayObject.value}`,
       });
 
       /**
@@ -506,8 +505,8 @@ export const getCombinedDateColumnData = (
        * updating the picker column value.
        */
       dateParts.push({
-        month: monthObject.month,
-        year: refParts.year,
+        month: referenceMonth.month,
+        year: referenceMonth.year,
         day: dayObject.value as number,
       });
     });