diff --git a/frontend/src/component/insights/components/LineChart/createChartOptions.ts b/frontend/src/component/insights/components/LineChart/createChartOptions.ts
index 82a515ff67..7b9abc0022 100644
--- a/frontend/src/component/insights/components/LineChart/createChartOptions.ts
+++ b/frontend/src/component/insights/components/LineChart/createChartOptions.ts
@@ -4,6 +4,7 @@ import type { TooltipState } from './ChartTooltip/ChartTooltip.jsx';
 import { createTooltip } from './createTooltip.js';
 import { legendOptions } from './legendOptions.js';
 import type { ChartOptions } from 'chart.js';
+import { getDateFnsLocale } from 'component/insights/getDateFnsLocale.js';
 
 export const createOptions = (
     theme: Theme,
@@ -59,10 +60,15 @@ export const createOptions = (
                 },
             },
             x: {
+                adapters: {
+                    date: {
+                        locale: getDateFnsLocale(locationSettings.locale),
+                    },
+                },
                 type: 'time',
                 time: {
                     unit: 'week',
-                    tooltipFormat: 'PPP',
+                    tooltipFormat: 'P',
                 },
                 grid: {
                     color: 'transparent',
diff --git a/frontend/src/component/insights/componentsChart/CreationArchiveChart/CreationArchiveChart.tsx b/frontend/src/component/insights/componentsChart/CreationArchiveChart/CreationArchiveChart.tsx
index 52a30975e1..0be2d7b4b6 100644
--- a/frontend/src/component/insights/componentsChart/CreationArchiveChart/CreationArchiveChart.tsx
+++ b/frontend/src/component/insights/componentsChart/CreationArchiveChart/CreationArchiveChart.tsx
@@ -23,6 +23,7 @@ import type { WeekData, RawWeekData } from './types.ts';
 import { createTooltip } from 'component/insights/components/LineChart/createTooltip.ts';
 import { CreationArchiveRatioTooltip } from './CreationArchiveRatioTooltip.tsx';
 import { Chart } from 'react-chartjs-2';
+import { getDateFnsLocale } from '../../getDateFnsLocale.ts';
 
 ChartJS.register(
     CategoryScale,
@@ -161,6 +162,11 @@ export const CreationArchiveChart: FC<ICreationArchiveChartProps> = ({
             locale: locationSettings.locale,
             scales: {
                 x: {
+                    adapters: {
+                        date: {
+                            locale: getDateFnsLocale(locationSettings.locale),
+                        },
+                    },
                     type: 'time' as const,
                     display: true,
                     time: {
diff --git a/frontend/src/component/insights/getDateFnsLocale.ts b/frontend/src/component/insights/getDateFnsLocale.ts
new file mode 100644
index 0000000000..88ee3d1969
--- /dev/null
+++ b/frontend/src/component/insights/getDateFnsLocale.ts
@@ -0,0 +1,33 @@
+import 'chartjs-adapter-date-fns';
+import {
+    cs,
+    de,
+    da,
+    enGB,
+    enIN,
+    enUS,
+    fr,
+    nb,
+    ptBR,
+    sv,
+    ja,
+} from 'date-fns/locale';
+import type { defaultLocales } from 'constants/defaultLocales';
+
+const dateFnsLocales: { [key in (typeof defaultLocales)[number]]: Locale } = {
+    cs: cs,
+    'da-DK': da,
+    de: de,
+    'en-GB': enGB,
+    'en-IN': enIN,
+    'en-US': enUS,
+    'fr-FR': fr,
+    ja: ja,
+    'nb-NO': nb,
+    'pt-BR': ptBR,
+    'sv-SE': sv,
+};
+
+export const getDateFnsLocale = (locale: string): Locale => {
+    return dateFnsLocales[locale] ?? enUS;
+};
diff --git a/frontend/src/component/user/Profile/ProfileTab/ProfileTab.tsx b/frontend/src/component/user/Profile/ProfileTab/ProfileTab.tsx
index 1f5098975f..8294844bad 100644
--- a/frontend/src/component/user/Profile/ProfileTab/ProfileTab.tsx
+++ b/frontend/src/component/user/Profile/ProfileTab/ProfileTab.tsx
@@ -22,6 +22,7 @@ import { RoleBadge } from 'component/common/RoleBadge/RoleBadge';
 import { useUiFlag } from 'hooks/useUiFlag';
 import { ProductivityEmailSubscription } from './ProductivityEmailSubscription.tsx';
 import { formatDateYMDHM } from 'utils/formatDate.ts';
+import { defaultLocales } from '../../../../constants/defaultLocales.ts';
 
 const StyledHeader = styled('div')(({ theme }) => ({
     display: 'flex',
@@ -116,17 +117,8 @@ export const ProfileTab = ({ user }: IProfileTabProps) => {
     const [currentLocale, setCurrentLocale] = useState<string>();
     const exampleDateId = useId();
 
-    const [possibleLocales, setPossibleLocales] = useState([
-        'en-US',
-        'en-GB',
-        'nb-NO',
-        'sv-SE',
-        'da-DK',
-        'en-IN',
-        'de',
-        'cs',
-        'pt-BR',
-        'fr-FR',
+    const [possibleLocales, setPossibleLocales] = useState<string[]>([
+        ...defaultLocales,
     ]);
 
     useEffect(() => {
diff --git a/frontend/src/constants/defaultLocales.ts b/frontend/src/constants/defaultLocales.ts
new file mode 100644
index 0000000000..bb0e3dcc63
--- /dev/null
+++ b/frontend/src/constants/defaultLocales.ts
@@ -0,0 +1,13 @@
+export const defaultLocales = [
+    'cs',
+    'da-DK',
+    'de',
+    'en-GB',
+    'en-IN',
+    'en-US',
+    'fr-FR',
+    'ja',
+    'nb-NO',
+    'pt-BR',
+    'sv-SE',
+] as const;