diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53dd6ff375..8695024f99 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project adheres to
 
 ### Added
 
+- ✨(frontend) make the full last-update date available #1215
 - ♿️(frontend) restore skip to content link after header redesign #2510
 - 🌐(i18n) rename cn_CN to zh_CN, add eo_PL and zh_TW locales #2486
 - ✨(backend) conditional email notification in server to server api #2554
diff --git a/src/frontend/apps/impress/src/features/docs/doc-header/__tests__/DocHeaderInfo.spec.tsx b/src/frontend/apps/impress/src/features/docs/doc-header/__tests__/DocHeaderInfo.spec.tsx
new file mode 100644
index 0000000000..2f36fc5474
--- /dev/null
+++ b/src/frontend/apps/impress/src/features/docs/doc-header/__tests__/DocHeaderInfo.spec.tsx
@@ -0,0 +1,111 @@
+import { act, fireEvent, render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import i18next from 'i18next';
+import { DateTime } from 'luxon';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import { Doc, LinkReach, Role } from '@/docs/doc-management';
+import { AppWrapper } from '@/tests/utils';
+
+import { DocHeaderInfo } from '../components/DocHeaderInfo';
+
+vi.mock('@/core', async () => {
+  const actual = await vi.importActual('@/core');
+
+  return {
+    ...actual,
+    useConfig: () => ({ data: {} }),
+  };
+});
+
+const updatedAt = '2026-08-14T14:23:00';
+const doc = {
+  id: 'doc-1',
+  abilities: {
+    partial_update: true,
+  },
+  ancestors_link_reach: LinkReach.RESTRICTED,
+  computed_link_reach: LinkReach.RESTRICTED,
+  deleted_at: null,
+  link_reach: LinkReach.RESTRICTED,
+  nb_accesses_ancestors: 0,
+  nb_accesses_direct: 1,
+  updated_at: updatedAt,
+  user_role: Role.OWNER,
+} as Doc;
+
+describe('<DocHeaderInfo />', () => {
+  beforeEach(() => {
+    const now = DateTime.now().set({
+      year: 2026,
+      month: 8,
+      day: 14,
+      hour: 14,
+      minute: 28,
+      second: 0,
+      millisecond: 0,
+    });
+    vi.spyOn(DateTime, 'now').mockReturnValue(now);
+  });
+
+  afterEach(async () => {
+    await act(async () => {
+      await i18next.changeLanguage('en');
+    });
+    vi.restoreAllMocks();
+  });
+
+  it('keeps the relative date and exposes the full date on focus', async () => {
+    const user = userEvent.setup();
+
+    render(<DocHeaderInfo doc={doc} />, { wrapper: AppWrapper });
+
+    const relativeDate = screen.getByText('5 minutes ago');
+    expect(relativeDate).toHaveTextContent('5 minutes ago');
+    expect(relativeDate.tagName).toBe('TIME');
+    expect(relativeDate).toHaveAttribute('datetime', updatedAt);
+    expect(relativeDate).not.toHaveAttribute('role', 'button');
+    expect(relativeDate).toHaveAccessibleName(
+      '5 minutes ago. 08/14/2026, 02:23 PM',
+    );
+
+    await user.tab();
+
+    expect(relativeDate).toHaveFocus();
+    expect(await screen.findByRole('tooltip')).toHaveTextContent(
+      '08/14/2026, 02:23 PM',
+    );
+  });
+
+  it('uses the current locale for the relative and full dates', async () => {
+    const user = userEvent.setup();
+
+    await act(async () => {
+      await i18next.changeLanguage('fr');
+    });
+
+    render(<DocHeaderInfo doc={doc} />, { wrapper: AppWrapper });
+
+    const relativeDate = screen.getByText('il y a 5 minutes');
+    await user.tab();
+
+    expect(relativeDate).toHaveFocus();
+    expect(await screen.findByRole('tooltip')).toHaveTextContent(
+      '14/08/2026 14:23',
+    );
+  });
+
+  it('exposes the full date on hover', async () => {
+    const user = userEvent.setup();
+
+    render(<DocHeaderInfo doc={doc} />, { wrapper: AppWrapper });
+
+    const relativeDate = screen.getByText('5 minutes ago');
+    fireEvent.pointerMove(relativeDate, { pointerType: 'mouse' });
+    await user.hover(relativeDate);
+
+    expect(await screen.findByRole('tooltip')).toHaveTextContent(
+      '08/14/2026, 02:23 PM',
+    );
+  });
+});
diff --git a/src/frontend/apps/impress/src/features/docs/doc-header/components/DocHeaderInfo.tsx b/src/frontend/apps/impress/src/features/docs/doc-header/components/DocHeaderInfo.tsx
index c5f7f8d739..390beeb984 100644
--- a/src/frontend/apps/impress/src/features/docs/doc-header/components/DocHeaderInfo.tsx
+++ b/src/frontend/apps/impress/src/features/docs/doc-header/components/DocHeaderInfo.tsx
@@ -1,4 +1,6 @@
+import { Tooltip } from '@gouvfr-lasuite/cunningham-react';
 import { t } from 'i18next';
+import { ComponentPropsWithoutRef, forwardRef } from 'react';
 
 import PublicSVG from '@/assets/icons/ui-kit/public.svg';
 import ProtedtedSVG from '@/assets/icons/ui-kit/vpn_lock.svg';
@@ -21,10 +23,11 @@ interface DocHeaderInfoProps {
 export const DocHeaderInfo = ({ doc }: DocHeaderInfoProps) => {
   const { transRole } = useTrans();
   const { isEditable } = useIsCollaborativeEditable(doc);
-  const { relativeDate, calculateDaysLeft } = useDate();
+  const { relativeDate, formatDate, calculateDaysLeft } = useDate();
   const { data: config } = useConfig();
 
   const relativeOnly = relativeDate(doc.updated_at);
+  const fullDate = formatDate(doc.updated_at);
 
   const trashbinCutoff = config?.TRASHBIN_CUTOFF_DAYS;
 
@@ -62,13 +65,38 @@ export const DocHeaderInfo = ({ doc }: DocHeaderInfoProps) => {
         {dateLabel}
         &nbsp;
       </Text>
-      <Text as="dd" $variation="tertiary" $size="s" $margin="0">
-        {dateValue}
+      <Text
+        as="dd"
+        $variation="tertiary"
+        $size="s"
+        $direction="row"
+        $align="center"
+        $margin="0"
+      >
+        {trashbinCutoff && doc.deleted_at ? (
+          dateValue
+        ) : (
+          <Tooltip content={fullDate} placement="top">
+            <FocusableTime
+              dateTime={doc.updated_at}
+              aria-label={`${relativeOnly}. ${fullDate}`}
+            >
+              {relativeOnly}
+            </FocusableTime>
+          </Tooltip>
+        )}
       </Text>
     </Box>
   );
 };
 
+const FocusableTime = forwardRef<
+  HTMLTimeElement,
+  ComponentPropsWithoutRef<'time'>
+>((props, ref) => <time {...props} ref={ref} tabIndex={0} />);
+
+FocusableTime.displayName = 'FocusableTime';
+
 const VisibilityDoc = ({ doc }: { doc: Doc }) => {
   const docIsPublic = getDocLinkReach(doc) === LinkReach.PUBLIC;
   const docIsAuth = getDocLinkReach(doc) === LinkReach.AUTHENTICATED;