diff --git a/src/fragmentarium/domain/archaeology.test.ts b/src/fragmentarium/domain/archaeology.test.ts
index e259bf7e4..920f33103 100644
--- a/src/fragmentarium/domain/archaeology.test.ts
+++ b/src/fragmentarium/domain/archaeology.test.ts
@@ -135,6 +135,7 @@ test.each([
     },
     'some area > a house (Residential), II (1200 BCE - 1150 BCE), ' +
       'Room 42, On the floor (primary context). General notes.',
+    'de-DE',
   ],
   [
     'with secondary context',
@@ -144,36 +145,43 @@ test.each([
       date: null,
     },
     'a house (Residential), II, in shelf (secondary context).',
+    'de-DE',
   ],
   [
     'with area and notes',
     { area: 'some area', notes: 'General notes.' },
     'some area > a house (Residential), II (1200 BCE - 1150 BCE). General notes.',
+    'de-DE',
   ],
   [
     'without area or notes',
     { area: '' },
     'a house (Residential), II (1200 BCE - 1150 BCE).',
+    'en-US',
   ],
   [
     'without notes',
     { notes: '' },
     'a house (Residential), II (1200 BCE - 1150 BCE).',
+    'en-US',
   ],
   [
     'without building',
     { building: '' },
     '(Residential), II (1200 BCE - 1150 BCE).',
+    'de-DE',
   ],
   [
     'without buildingType',
     { buildingType: null },
     'a house, II (1200 BCE - 1150 BCE).',
+    'en-US',
   ],
   [
     'without levelLayerPhase and date',
     { levelLayerPhase: '', date: null },
     'a house (Residential).',
+    'de-DE',
   ],
   [
     'with date notes',
@@ -181,6 +189,7 @@ test.each([
       date: { ...defaultParams.date, notes: 'date notes' },
     },
     'a house (Residential), II (1200 BCE - 1150 BCE, date notes).',
+    'en-US',
   ],
   [
     'with CE date (en-US)',
@@ -214,6 +223,6 @@ test.each([
       ...overrideParams,
     })
 
-    expect(findspot.toString(locale)).toEqual(expected)
+    expect(findspot.toString()).toEqual(expected)
   }
 )
diff --git a/src/fragmentarium/ui/info/Details.test.tsx b/src/fragmentarium/ui/info/Details.test.tsx
index f0d47c579..2a9228a95 100644
--- a/src/fragmentarium/ui/info/Details.test.tsx
+++ b/src/fragmentarium/ui/info/Details.test.tsx
@@ -171,42 +171,47 @@ describe('All details', () => {
 })
 
 describe('ExcavationDate', () => {
+  beforeEach(() => {
+    fragmentService.fetchGenres.mockResolvedValue([])
+    fragmentService.fetchPeriods.mockResolvedValue([])
+    Object.defineProperty(navigator, 'language', {
+      value: 'en-US',
+      writable: true,
+    })
+  })
+
   it('renders excavation date when isRegularExcavation is true', async () => {
     const excavationDate = {
-      start: new PartialDate(2024, 10, 5),
+      start: new PartialDate(2024, 5, 10),
       end: new PartialDate(2024, 10, 10),
     }
-
     fragment = fragmentFactory.build({
       archaeology: {
         isRegularExcavation: true,
         date: excavationDate,
       },
     })
-
     await renderDetails()
 
     expect(screen.getByText('Regular Excavation')).toBeInTheDocument()
-    expect(screen.getByText('2024.10.05 – 2024.10.10')).toBeInTheDocument() // or use the specific date format
+    expect(screen.getByText('05/10/2024 – 10/10/2024')).toBeInTheDocument()
   })
 
   it('renders only start date when end date is missing', async () => {
     const excavationDate = {
-      start: new PartialDate(2024, 10, 5),
+      start: new PartialDate(2024, 5, 10),
       end: null,
     }
-
     fragment = fragmentFactory.build({
       archaeology: {
         isRegularExcavation: true,
         date: excavationDate,
       },
     })
-
     await renderDetails()
 
     expect(screen.getByText('Regular Excavation')).toBeInTheDocument()
-    expect(screen.getByText('2024.10.05')).toBeInTheDocument()
+    expect(screen.getByText('05/10/2024')).toBeInTheDocument()
   })
 
   it('does not render excavation date when isRegularExcavation is false', async () => {
@@ -216,11 +221,10 @@ describe('ExcavationDate', () => {
         date: undefined,
       },
     })
-
     await renderDetails()
 
-    expect(screen.queryByText('Regular Excavation')).not.toBeInTheDocument()
-    expect(screen.queryByText('2024.10.05')).not.toBeInTheDocument()
+    expect(screen.queryByText(/Regular Excavation/)).not.toBeInTheDocument()
+    expect(screen.queryByText(/10\/05\/2024/)).not.toBeInTheDocument()
   })
 })