InputTime takes formatTime for custom i18n time string formatting

src/components/InputTime/AsString.tsx

@@ -29,6 +29,7 @@ import styles from './InputTime.module.css';
 
 export interface AsStringProps
   extends Omit<InputProps, 'value' | 'max' | 'min'> {
+  formatTime?: (date: Date) => string;
   fuzzyInputProps?: InputProps;
   max?: string;
   min?: string;
@@ -40,6 +41,7 @@ export interface AsStringProps
 const AsString: React.FC<AsStringProps> = ({
   className = '',
   disabled,
+  formatTime,
   forwardedRef,
   fuzzyInputProps = {},
   max,
@@ -101,7 +103,7 @@ const AsString: React.FC<AsStringProps> = ({
 
   // Fuzzy value is user input.
   const [fuzzyValue, setFuzzyValue] = useState(
-    value ? getLocaleTimeStringFromShortTimeString(value) : ''
+    value ? getLocaleTimeStringFromShortTimeString(value, { formatTime }) : ''
   );
 
   const syncValidity = (
@@ -142,16 +144,21 @@ const AsString: React.FC<AsStringProps> = ({
   };
 
   const handleBlurFuzzyValue = () => {
-    setFuzzyValue(value ? getLocaleTimeStringFromShortTimeString(value) : '');
+    setFuzzyValue(
+      value ? getLocaleTimeStringFromShortTimeString(value, { formatTime }) : ''
+    );
   };
 
   const handleSelectMenuItem = (e: { target: { value: Date } }) => {
     const dateTime = e.target.value;
 
-    const label = dateTime.toLocaleTimeString([], {
-      hour: 'numeric',
-      minute: '2-digit',
-    });
+    const label =
+      typeof formatTime === 'function'
+        ? formatTime(dateTime)
+        : dateTime.toLocaleTimeString([], {
+            hour: 'numeric',
+            minute: '2-digit',
+          });
 
     const timeString = getShortTimeString(
       dateTime.getHours(),
@@ -170,11 +177,15 @@ const AsString: React.FC<AsStringProps> = ({
     }
 
     if (localRef?.current && document.activeElement !== localRef?.current) {
-      setFuzzyValue(value ? getLocaleTimeStringFromShortTimeString(value) : '');
+      setFuzzyValue(
+        value
+          ? getLocaleTimeStringFromShortTimeString(value, { formatTime })
+          : ''
+      );
     }
 
     syncValidity(shadowTimeInputRef, localRef);
-  }, [localRef, shadowTimeInputRef, step, value]);
+  }, [formatTime, localRef, shadowTimeInputRef, step, value]);
 
   // Sync validity on min/max changes
   useEffect(() => {
@@ -212,16 +223,17 @@ const AsString: React.FC<AsStringProps> = ({
         />
         {showDropdown && (
           <Dropdown
-            toggleAriaLabel={toggleAriaLabel}
             className={styles.addons}
             disabled={disabled}
+            formatTime={formatTime}
             max={max}
             min={min}
-            value={value}
             onSelectMenuItem={handleSelectMenuItem}
             showDropdown={showDropdown}
             step={dropdownStep}
             stepFrom={stepFrom}
+            toggleAriaLabel={toggleAriaLabel}
+            value={value}
           />
         )}
       </div>

src/components/InputTime/Dropdown/Dropdown.tsx

@@ -22,6 +22,7 @@ import styles from './Dropdown.module.css';
 interface DropdownProps {
   className?: string;
   disabled?: boolean;
+  formatTime?: (date: Date) => string;
   max?: string;
   min?: string;
   onSelectMenuItem: Function;
@@ -36,6 +37,7 @@ interface DropdownProps {
 const Dropdown: React.FC<DropdownProps> = ({
   className = '',
   disabled,
+  formatTime,
   max,
   min,
   onSelectMenuItem,
@@ -94,10 +96,13 @@ const Dropdown: React.FC<DropdownProps> = ({
     do {
       attempts += 1;
 
-      const label = current.toLocaleTimeString([], {
-        hour: 'numeric',
-        minute: '2-digit',
-      });
+      const label =
+        typeof formatTime === 'function'
+          ? formatTime(current)
+          : current.toLocaleTimeString([], {
+              hour: 'numeric',
+              minute: '2-digit',
+            });
 
       if (
         (maxDate === undefined || current <= maxDate) &&
@@ -116,7 +121,16 @@ const Dropdown: React.FC<DropdownProps> = ({
     } while (attempts <= maxAttempts && current < end);
 
     return options;
-  }, [customStep, max, min, value, onSelectMenuItem, showDropdown, stepFrom]);
+  }, [
+    customStep,
+    formatTime,
+    max,
+    min,
+    onSelectMenuItem,
+    showDropdown,
+    stepFrom,
+    value,
+  ]);
 
   return (
     <EasyDropdown

src/components/InputTime/InputTime.test.tsx

@@ -72,6 +72,7 @@ describe('InputTime', () => {
         <input
           data-testid="InputTime test"
           min="01:30"
+          onChange={() => {}}
           step="2700"
           value="01:30"
         />
@@ -125,6 +126,40 @@ describe('InputTime', () => {
     });
   });
 
+  describe('when passed a custom `formatTime` prop', () => {
+    it('uses the custom formatter for the fuzzy input', () => {
+      const { getByLabelText } = render(
+        <InputTime
+          formatTime={(date: Date) =>
+            `${date.getHours()}🎈:${date.getMinutes()}🐝`
+          }
+          fuzzyInputProps={{ 'aria-label': 'time input' }}
+          value="01:30"
+        />
+      );
+
+      const baseInputTime = getByLabelText('time input') as HTMLInputElement;
+      expect(baseInputTime.value).toEqual('1🎈:30🐝');
+    });
+
+    it('uses the custom formatter for the dropdown options', () => {
+      const { getByLabelText, queryByText } = render(
+        <InputTime
+          formatTime={(date: Date) =>
+            `${date.getHours()}🎈:${date.getMinutes()}🐝`
+          }
+          toggleAriaLabel="Toggle"
+        />
+      );
+
+      const toggle = getByLabelText('Toggle');
+      // Open dropdown
+      userEvent.click(toggle);
+      const select10 = queryByText('10🎈:0🐝');
+      expect(select10).toBeTruthy();
+    });
+  });
+
   describe('dropdown time picker', () => {
     it('clicking a time selects it', () => {
       const handleChange = jest.fn((e) => {

src/components/InputTime/story.tsx

@@ -191,6 +191,17 @@ storiesOf('Planets/InputTime', module)
               value={defaultValueDate}
             />
           </Wrap>
+          <Wrap>
+            <Title>With a custom `formatTime` function</Title>
+            <InteractiveInput
+              Component={InputTime}
+              formatTime={(date: Date) =>
+                `${date.getHours()}🎈:${date.getMinutes()}🐝`
+              }
+              onChange={action('onChange date')}
+              value={new Date().toISOString()}
+            />
+          </Wrap>
           <Wrap>
             <Title>Requires you to pick a future date time</Title>
             <InteractiveInput

src/components/InputTime/utils.ts

@@ -62,11 +62,16 @@ export const getDateTimeFromShortTimeString = (value: string) => {
   return date;
 };
 
-export const getLocaleTimeStringFromShortTimeString = (value: string) =>
-  getDateTimeFromShortTimeString(value).toLocaleTimeString([], {
-    hour: 'numeric',
-    minute: '2-digit',
-  });
+export const getLocaleTimeStringFromShortTimeString = (
+  value: string,
+  { formatTime }
+) =>
+  typeof formatTime === 'function'
+    ? formatTime(getDateTimeFromShortTimeString(value))
+    : getDateTimeFromShortTimeString(value).toLocaleTimeString([], {
+        hour: 'numeric',
+        minute: '2-digit',
+      });
 
 export const guessTimeFromString = (string: string) => {
   const invalidChars = new RegExp('[^\\d:\\spam.]', 'gi');