fix(TimePicker): with some locales, the hour format in the input and picker is inconsistent.

Author: mrholek

js/src/util/time.js

@@ -63,8 +63,9 @@ export const getAmPm = (date, locale) => {
 export const formatTimePartials = (values, locale, partial) => {
   const date = new Date()
 
+  const forceTwoDigit = shouldUseTwoDigitHour(locale)
   const formatter = new Intl.DateTimeFormat(locale, {
-    hour: 'numeric',
+    hour: forceTwoDigit ? '2-digit' : 'numeric',
     minute: '2-digit',
     second: '2-digit'
   })
@@ -191,3 +192,19 @@ export const isValidTime = time => {
   const d = new Date(`1970-01-01 ${time}`)
   return d instanceof Date && !Number.isNaN(d.getTime())
 }
+
+/**
+ * Checks whether the given locale formats the hour "9" with a leading zero ("09")
+ * when using `hour: 'numeric'` in `toLocaleTimeString`.
+ *
+ * This helps determine if you should force `hour: '2-digit'` for consistent formatting.
+ *
+ * @param {string} locale - The locale code (e.g., "en-US", "pl-PL").
+ * @returns {boolean} `true` if the formatted hour starts with a leading zero, otherwise `false`.
+ */
+export const shouldUseTwoDigitHour = locale => {
+  const d = new Date(2020, 0, 1, 7, 5, 7) // 7:05:07
+  const formatted = d.toLocaleTimeString(locale)
+
+  return formatted.startsWith('0') // check if the hour starts with "0"
+}