fix(datetime): selecting days updates value

core/src/components/datetime/datetime.tsx

@@ -561,7 +561,7 @@ export class Datetime implements ComponentInterface {
    * "activePartsClone" and then falling back to
    * today's DatetimeParts if no active date is selected.
    */
-  private getDefaultPart = () => {
+  private getDefaultPart = (): DatetimeParts => {
     const { activePartsClone, todayParts } = this;
 
     const firstPart = Array.isArray(activePartsClone) ? activePartsClone[0] : activePartsClone;
@@ -1393,7 +1393,9 @@ export class Datetime implements ComponentInterface {
   }
 
   private renderCombinedDatePickerColumn() {
-    const { activeParts, workingParts, locale, minParts, maxParts, todayParts, isDateEnabled } = this;
+    const { workingParts, locale, minParts, maxParts, todayParts, isDateEnabled } = this;
+
+    const activePart = this.getDefaultPart();
 
     /**
      * By default, generate a range of 3 months:
@@ -1489,12 +1491,10 @@ export class Datetime implements ComponentInterface {
             ...findPart,
           });
 
-          if (!Array.isArray(activeParts)) {
-            this.setActiveParts({
-              ...activeParts,
-              ...findPart,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            ...findPart,
+          });
 
           // We can re-attach the scroll listener after
           // the working parts have been updated.
@@ -1583,7 +1583,9 @@ export class Datetime implements ComponentInterface {
       return [];
     }
 
-    const { activeParts, workingParts } = this;
+    const { workingParts } = this;
+
+    const activePart = this.getDefaultPart();
 
     return (
       <ion-picker-column-internal
@@ -1605,12 +1607,10 @@ export class Datetime implements ComponentInterface {
             day: ev.detail.value,
           });
 
-          if (!Array.isArray(activeParts)) {
-            this.setActiveParts({
-              ...activeParts,
-              day: ev.detail.value,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            day: ev.detail.value,
+          });
 
           // We can re-attach the scroll listener after
           // the working parts have been updated.
@@ -1627,7 +1627,9 @@ export class Datetime implements ComponentInterface {
       return [];
     }
 
-    const { activeParts, workingParts } = this;
+    const { workingParts } = this;
+
+    const activePart = this.getDefaultPart();
 
     return (
       <ion-picker-column-internal
@@ -1649,12 +1651,10 @@ export class Datetime implements ComponentInterface {
             month: ev.detail.value,
           });
 
-          if (!Array.isArray(activeParts)) {
-            this.setActiveParts({
-              ...activeParts,
-              month: ev.detail.value,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            month: ev.detail.value,
+          });
 
           // We can re-attach the scroll listener after
           // the working parts have been updated.
@@ -1670,7 +1670,9 @@ export class Datetime implements ComponentInterface {
       return [];
     }
 
-    const { activeParts, workingParts } = this;
+    const { workingParts } = this;
+
+    const activePart = this.getDefaultPart();
 
     return (
       <ion-picker-column-internal
@@ -1692,12 +1694,10 @@ export class Datetime implements ComponentInterface {
             year: ev.detail.value,
           });
 
-          if (!Array.isArray(activeParts)) {
-            this.setActiveParts({
-              ...activeParts,
-              year: ev.detail.value,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            year: ev.detail.value,
+          });
 
           // We can re-attach the scroll listener after
           // the working parts have been updated.
@@ -1750,12 +1750,10 @@ export class Datetime implements ComponentInterface {
             hour: ev.detail.value,
           });
 
-          if (!Array.isArray(activePart)) {
-            this.setActiveParts({
-              ...activePart,
-              hour: ev.detail.value,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            hour: ev.detail.value,
+          });
 
           ev.stopPropagation();
         }}
@@ -1780,12 +1778,10 @@ export class Datetime implements ComponentInterface {
             minute: ev.detail.value,
           });
 
-          if (!Array.isArray(activePart)) {
-            this.setActiveParts({
-              ...activePart,
-              minute: ev.detail.value,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            minute: ev.detail.value,
+          });
 
           ev.stopPropagation();
         }}
@@ -1816,13 +1812,11 @@ export class Datetime implements ComponentInterface {
             hour,
           });
 
-          if (!Array.isArray(activePart)) {
-            this.setActiveParts({
-              ...activePart,
-              ampm: ev.detail.value,
-              hour,
-            });
-          }
+          this.setActiveParts({
+            ...activePart,
+            ampm: ev.detail.value,
+            hour,
+          });
 
           ev.stopPropagation();
         }}
@@ -1914,6 +1908,8 @@ export class Datetime implements ComponentInterface {
     // can free-scroll the calendar.
     const isWorkingMonth = this.workingParts.month === month && this.workingParts.year === year;
 
+    const activePart = this.getDefaultPart();
+
     return (
       <div
         // Non-visible months should be hidden from screen readers
@@ -1998,7 +1994,7 @@ export class Datetime implements ComponentInterface {
                     );
                   } else {
                     this.setActiveParts({
-                      ...this.activeParts,
+                      ...activePart,
                       month,
                       day,
                       year,

core/src/components/datetime/test/basic/datetime.e2e.ts

@@ -72,6 +72,39 @@ test.describe('datetime: selecting a day', () => {
 
     await expect(activeDay).toHaveText('13');
   });
+  test('should set both date and time when no value is initially set', async ({ page }) => {
+    await page.setContent(`
+      <ion-datetime locale="en-US" presentation="date-time"></ion-datetime>
+
+      <script>
+        const mockToday = '2022-10-10T16:22';
+        Date = class extends Date {
+          constructor(...args) {
+            if (args.length === 0) {
+              super(mockToday)
+            } else {
+              super(...args);
+            }
+          }
+        }
+      </script>
+    `);
+
+    await page.waitForSelector('.datetime-ready');
+    const datetime = page.locator('ion-datetime');
+    const ionChange = await page.spyOnEvent('ionChange');
+
+    // Oct 1, 2022
+    await page.click('.calendar-day[data-month="10"][data-year="2022"][data-day="1"]');
+
+    await ionChange.next();
+
+    const value = await datetime.evaluate((el: HTMLIonDatetimeElement) => el.value);
+    await expect(typeof value).toBe('string');
+
+    // Check to make sure value includes current time
+    await expect(value!.includes('2022-10-01T16:22')).toBe(true);
+  });
 });
 
 test.describe('datetime: confirm date', () => {

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

@@ -112,6 +112,64 @@ test.describe('datetime: prefer wheel', () => {
       expect(await yearValues.count()).toBe(3);
       expect(await dayValues.count()).toBe(5);
     });
+    test('selecting month should update value when no value is set', async ({ page }) => {
+      await page.setContent(`
+        <ion-datetime
+          presentation="date"
+          prefer-wheel="true"
+        ></ion-datetime>
+      `);
+
+      await page.waitForSelector('.datetime-ready');
+
+      const ionChange = await page.spyOnEvent('ionChange');
+      const monthValues = page.locator('.month-column .picker-item:not(.picker-item-empty)');
+
+      // Change month value
+      await monthValues.nth(0).click();
+
+      await ionChange.next();
+    });
+    test('selecting day should update value when no value is set', async ({ page }) => {
+      await page.setContent(`
+        <ion-datetime
+          presentation="date"
+          prefer-wheel="true"
+        ></ion-datetime>
+      `);
+
+      await page.waitForSelector('.datetime-ready');
+
+      const ionChange = await page.spyOnEvent('ionChange');
+      const dayValues = page.locator('.day-column .picker-item:not(.picker-item-empty)');
+
+      // Change day value
+      await dayValues.nth(0).click();
+
+      await ionChange.next();
+    });
+    test('selecting year should update value when no value is set', async ({ page }) => {
+      await page.setContent(`
+        <ion-datetime
+          presentation="date"
+          prefer-wheel="true"
+        ></ion-datetime>
+      `);
+
+      await page.waitForSelector('.datetime-ready');
+
+      const ionChange = await page.spyOnEvent('ionChange');
+      const yearValues = page.locator('.year-column .picker-item:not(.picker-item-empty)');
+
+      /**
+       * Change year value
+       * The 0th index is the current
+       * year, so select something other than that.
+       */
+      await yearValues.nth(10).click();
+
+      await ionChange.next();
+    });
     test.describe('datetime: date wheel localization', () => {
       test('should correctly localize the date data', async ({ page }) => {
         await page.setContent(`
@@ -314,6 +372,24 @@ test.describe('datetime: prefer wheel', () => {
 
       expect(await dayValues.count()).toBe(15);
     });
+    test('selecting date should update value when no value is set', async ({ page }) => {
+      await page.setContent(`
+        <ion-datetime
+          presentation="date-time"
+          prefer-wheel="true"
+        ></ion-datetime>
+      `);
+
+      await page.waitForSelector('.datetime-ready');
+
+      const ionChange = await page.spyOnEvent('ionChange');
+      const dayValues = page.locator('.date-column .picker-item:not(.picker-item-empty)');
+
+      // Change day/month value
+      await dayValues.nth(0).click();
+
+      await ionChange.next();
+    });
   });
   test.describe('datetime: time-date wheel', () => {
     test.beforeEach(({ skip }) => {