fix(datetime): minutes only filtered when max hour matches current hour (#24710)

Resolves #24702

Author: sean-perkins

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

@@ -95,7 +95,7 @@ describe('generateTime()', () => {
       day: 19,
       month: 5,
       year: 2021,
-      hour: 5,
+      hour: 7,
       minute: 43
     }
     const max = {
@@ -287,5 +287,50 @@ describe('generateTime()', () => {
 
       expect(hours).toStrictEqual([19, 20]);
     });
+
+    it('should return the filtered minutes when the max bound is set', () => {
+      const refValue = {
+        day: undefined,
+        month: undefined,
+        year: undefined,
+        hour: 13,
+        minute: 0
+      };
+
+      const maxParts = {
+        day: undefined,
+        month: undefined,
+        year: undefined,
+        hour: 13,
+        minute: 2
+      };
+
+      const { minutes } = generateTime(refValue, 'h23', undefined, maxParts);
+
+      expect(minutes).toStrictEqual([0, 1, 2]);
+    });
+
+    it('should not filter minutes when the current hour is less than the max hour bound', () => {
+      const refValue = {
+        day: undefined,
+        month: undefined,
+        year: undefined,
+        hour: 12,
+        minute: 0
+      };
+
+      const maxParts = {
+        day: undefined,
+        month: undefined,
+        year: undefined,
+        hour: 13,
+        minute: 2
+      };
+
+      const { minutes } = generateTime(refValue, 'h23', undefined, maxParts);
+
+      expect(minutes.length).toEqual(60);
+    });
+
   })
 })

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

@@ -223,7 +223,11 @@ export const generateTime = (
         });
         isPMAllowed = maxParts.hour >= 13;
       }
-      if (maxParts.minute !== undefined) {
+      if (maxParts.minute !== undefined && refParts.hour === maxParts.hour) {
+        // The available minutes should only be filtered when the hour is the same as the max hour.
+        // For example if the max hour is 10:30 and the current hour is 10:00,
+        // users should be able to select 00-30 minutes.
+        // If the current hour is 09:00, users should be able to select 00-60 minutes.
         processedMinutes = processedMinutes.filter(minute => minute <= maxParts.minute!);
       }