diff --git a/lib/Datepicker/Calendar.js b/lib/Datepicker/Calendar.js
index e013d392d..117251dee 100644
--- a/lib/Datepicker/Calendar.js
+++ b/lib/Datepicker/Calendar.js
@@ -124,7 +124,10 @@ class Calendar extends React.Component {
   constructor(props) {
     super(props);
 
-    moment.locale(this.props.intl.locale || this.props.locale);
+    const computedLocale = this.props.intl.locale || this.props.locale;
+    if (moment.locales().includes(computedLocale)) {
+      moment.locale(computedLocale);
+    }
 
     const { selectedDate, dateFormat } = this.props;
 
diff --git a/lib/Datepicker/tests/Datepicker-test.js b/lib/Datepicker/tests/Datepicker-test.js
index fbeb181a3..67704ba08 100644
--- a/lib/Datepicker/tests/Datepicker-test.js
+++ b/lib/Datepicker/tests/Datepicker-test.js
@@ -594,6 +594,8 @@ describe('Datepicker', () => {
       await datepicker.openCalendar();
     });
 
+    it('does not poison moment locale cache', () => expect(moment.locales()).to.not.include('en-se'));
+
     it('renders Monday as the first day of the week', () => Weekday('Mon', { index: 0 }).exists());
 
     it('renders weekday and month days in correct alignment', async () => {
diff --git a/lib/Timepicker/TimeDropdown.js b/lib/Timepicker/TimeDropdown.js
index 6ad159034..91f01551c 100644
--- a/lib/Timepicker/TimeDropdown.js
+++ b/lib/Timepicker/TimeDropdown.js
@@ -50,7 +50,9 @@ class TimeDropdown extends React.Component {
   constructor(props) {
     super(props);
 
-    moment.locale(this.props.locale);
+    if (moment.locales().includes(this.props.locale)) {
+      moment.locale(this.props.locale);
+    }
 
     // handle existing value...
     let initMoment;
diff --git a/lib/Timepicker/tests/Timepicker-test.js b/lib/Timepicker/tests/Timepicker-test.js
index ef03ea5be..86ce92f13 100644
--- a/lib/Timepicker/tests/Timepicker-test.js
+++ b/lib/Timepicker/tests/Timepicker-test.js
@@ -1,6 +1,8 @@
+import { expect } from 'chai';
 import React from 'react';
 import { describe, beforeEach, it } from 'mocha';
-import moment from 'moment-timezone';
+import moment from 'moment';
+import momentTz from 'moment-timezone';
 import {
   runAxeTest,
   HTML,
@@ -107,6 +109,21 @@ describe('Timepicker', () => {
     it('emits an event with the time formatted as displayed', () => converge(() => (timeOutput === '05:00 PM')));
   });
 
+  describe('correctly handles unknown locales (en-SE)', () => {
+    beforeEach(async () => {
+      await mountWithContext(
+        <Timepicker
+          id="timepicker-locale-test"
+          locale="en-SE"
+        />
+      );
+
+      await timepicker.clickInput();
+    });
+
+    it('does not poison moment locale cache', () => expect(moment.locales()).to.not.include('en-se'));
+  });
+
   describe('selecting a time with timeZone prop', () => {
     let timeOutput;
 
@@ -166,7 +183,7 @@ describe('Timepicker', () => {
         await timepicker.fillIn('05:00 PM');
       });
 
-      it('returns an ISO 8601 time string for specific time zone', () => converge(() => (timeOutput === moment().tz(tz).isDST() ? '00:00:00.000Z' : '01:00:00.000Z')));
+      it('returns an ISO 8601 time string for specific time zone', () => converge(() => (timeOutput === momentTz().tz(tz).isDST() ? '00:00:00.000Z' : '01:00:00.000Z')));
     });
   });
 
diff --git a/util/dateTimeUtils.js b/util/dateTimeUtils.js
index 5f90f7bc0..d95fa7559 100644
--- a/util/dateTimeUtils.js
+++ b/util/dateTimeUtils.js
@@ -48,7 +48,9 @@ export const getLocaleDateFormat = ({ intl }) => {
     format = getMomentLocalizedFormat(intl);
   }
 
-  return format;
+  // replace narrow non-breaking space introduced in ICU 72.1
+  // see https://github.com/nodejs/node/issues/46123
+  return format.replaceAll('\u202f', ' ');
 };
 
 // getLocalizedTimeFormatInfo() -
@@ -128,7 +130,7 @@ export function getLocalizedTimeFormatInfo(locale) {
 
   return {
     ...formatInfo,
-    timeFormat,
+    timeFormat: timeFormat.replaceAll('\u202f', ' '),
     dayPeriods: [...dpOptions],
   };
 }