feat: add keyboard accessibility for timepicker

src/generic/datepicker-control/DatepickerControl.jsx

@@ -32,6 +32,22 @@ const DatepickerControl = ({
     [DATEPICKER_TYPES.date]: DATE_FORMAT,
     [DATEPICKER_TYPES.time]: TIME_FORMAT,
   };
+  const isTimePicker = type === DATEPICKER_TYPES.time;
+
+  let describedByIds;
+  if (isTimePicker) {
+    const ids = [`${controlName}-timehint`];
+    if (helpText) {
+      ids.push(`${controlName}-helptext`);
+    }
+    describedByIds = ids.filter(Boolean).join(' ') || undefined;
+  } else if (helpText) {
+    describedByIds = `${controlName}-helptext`;
+  }
+
+  const ariaLabel = isTimePicker
+    ? intl.formatMessage(messages.timepickerAriaLabel)
+    : undefined;
 
   return (
     <Form.Group className="form-group-custom datepicker-custom">
@@ -67,14 +83,27 @@ const DatepickerControl = ({
           showTimeSelectOnly={type === DATEPICKER_TYPES.time}
           placeholderText={inputFormat[type].toLocaleUpperCase()}
           showPopperArrow={false}
+          ariaLabel={ariaLabel}
+          ariaDescribedBy={describedByIds}
           onChange={(date) => {
             if (isValidDate(date)) {
               onChange(convertToStringFromDate(date));
             }
           }}
         />
       </div>
-      {helpText && <Form.Control.Feedback>{helpText}</Form.Control.Feedback>}
+      {isTimePicker && (
+        <Form.Text id={`${controlName}-timehint`} className="sr-only">
+          {intl.formatMessage(messages.timepickerScreenreaderHint, {
+            timeFormat: inputFormat[type].toLocaleUpperCase(),
+          })}
+        </Form.Text>
+      )}
+      {helpText && (
+        <Form.Control.Feedback id={`${controlName}-helptext`}>
+          {helpText}
+        </Form.Control.Feedback>
+      )}
     </Form.Group>
   );
 };

src/generic/datepicker-control/DatepickerControl.test.jsx

@@ -48,4 +48,21 @@ describe('<DatepickerControl />', () => {
       convertToStringFromDate('06/16/2023'),
     );
   });
+
+  it('renders time picker with accessibility hint', () => {
+    const { getByText, getByPlaceholderText } = render(
+      <RootWrapper
+        {...props}
+        type={DATEPICKER_TYPES.time}
+        value="2025-01-01T10:00:00Z"
+        helpText=""
+      />,
+    );
+    const input = getByPlaceholderText('HH:MM');
+
+    expect(
+      getByText('Enter time in HH:MM or twelve-hour format, for example 6:00 PM.'),
+    ).toBeInTheDocument();
+    expect(input.getAttribute('aria-describedby')).toContain('fooControlName-timehint');
+  });
 });

src/generic/datepicker-control/messages.js

@@ -9,6 +9,14 @@ const messages = defineMessages({
     id: 'course-authoring.schedule.schedule-section.datepicker.utc',
     defaultMessage: 'UTC',
   },
+  timepickerAriaLabel: {
+    id: 'course-authoring.schedule.schedule-section.timepicker.aria-label',
+    defaultMessage: 'Time input field. Enter a time or use the arrow keys to adjust.',
+  },
+  timepickerScreenreaderHint: {
+    id: 'course-authoring.schedule.schedule-section.timepicker.screenreader-hint',
+    defaultMessage: 'Enter time in {timeFormat} or twelve-hour format, for example 6:00 PM.',
+  },
 });
 
 export default messages;