diff --git a/client/src/components/Planner/ReservationModal.tsx b/client/src/components/Planner/ReservationModal.tsx
index 58b61b849..d282e22c3 100644
--- a/client/src/components/Planner/ReservationModal.tsx
+++ b/client/src/components/Planner/ReservationModal.tsx
@@ -80,7 +80,7 @@ export function ReservationModal({ isOpen, onClose, onSave, reservation, days, p
 
   const {
     form, setForm, set, isSaving, setIsSaving, pendingFiles, setPendingFiles, travelerIds, setTravelerIds, toggleTraveler,
-    isEndBeforeStart, dateBounds: tripDateRange, startDate, startTime, setStartDate, setStartTime, takeStopDay,
+    isEndBeforeStart, endTimeBeforeStartTime, dateBounds: tripDateRange, startDate, startTime, setStartDate, setStartTime, takeStopDay,
     pickPlace, pickHotelPlace, pickHotelStart, pickHotelEnd, saveData: buildSaveData,
   } = useReservationForm(EMPTY_FORM, days, places)
   const attach = useBookingFileAttach({ reservation, files, onFileUpload, setPendingFiles, toast, t })
@@ -277,7 +277,10 @@ export function ReservationModal({ isOpen, onClose, onSave, reservation, days, p
                 max={tripDateRange.max}
               />
             </EditorField>
-            <EditorField label={t('reservations.endTime')}>
+            <EditorField
+              label={t('reservations.endTime')}
+              hint={endTimeBeforeStartTime ? <span className="text-warning">{t('reservations.validation.endTimeBeforeStartTime')}</span> : undefined}
+            >
               <CustomTimePicker value={form.reservation_end_time} onChange={v => set('reservation_end_time', v)} />
             </EditorField>
           </div>
diff --git a/client/src/components/Planner/reservationFormModel.test.ts b/client/src/components/Planner/reservationFormModel.test.ts
index f1462d9bc..9eae38102 100644
--- a/client/src/components/Planner/reservationFormModel.test.ts
+++ b/client/src/components/Planner/reservationFormModel.test.ts
@@ -1,4 +1,4 @@
-// FE-PLANNER-RESFORM-001 to -015: the booking form both the desktop ReservationModal
+// FE-PLANNER-RESFORM-001 to -016: the booking form both the desktop ReservationModal
 // and the phone's booking sheet save through.
 import { describe, expect, it } from 'vitest';
 
@@ -8,6 +8,7 @@ import type { BookingReviewDraft } from './parsedItemToDraft';
 import {
   RESERVATION_TYPE_OPTIONS,
   type ReservationFields,
+  endTimeBeforeStartTime,
   isEndBeforeStart,
   reservationFieldsFrom,
   reservationFieldsFromPrefill,
@@ -175,6 +176,24 @@ describe('reservation dates', () => {
     expect(isEndBeforeStart(form({ end_date: '2026-07-01' }))).toBe(false);
   });
 
+  it('FE-PLANNER-RESFORM-016: an end time before the start time without an end date warns but does not block (#2604)', () => {
+    const overnight = form({ reservation_time: '2026-11-24T18:00', reservation_end_time: '09:00' });
+    expect(endTimeBeforeStartTime(overnight)).toBe(true);
+    // Time zones can make a booking end "before" it starts, so the save stays open.
+    expect(isEndBeforeStart(overnight)).toBe(false);
+    expect(endTimeBeforeStartTime(form({ reservation_time: '2026-11-24T09:00', reservation_end_time: '18:00' }))).toBe(false);
+    expect(endTimeBeforeStartTime(form({ reservation_time: '2026-11-24T18:00', reservation_end_time: '18:00' }))).toBe(false);
+    // With the next day as end date the times are fine, and an end date of its own is checked by isEndBeforeStart.
+    expect(
+      endTimeBeforeStartTime(form({ reservation_time: '2026-11-24T18:00', end_date: '2026-11-25', reservation_end_time: '09:00' }))
+    ).toBe(false);
+    expect(endTimeBeforeStartTime(form({ reservation_time: '2026-11-24', reservation_end_time: '09:00' }))).toBe(false);
+    expect(endTimeBeforeStartTime(form({ reservation_end_time: '09:00' }))).toBe(false);
+    expect(
+      endTimeBeforeStartTime(form({ type: 'hotel', reservation_time: '2026-11-24T18:00', reservation_end_time: '09:00' }))
+    ).toBe(false);
+  });
+
   it('FE-PLANNER-RESFORM-006: the start is edited as a date and a time', () => {
     expect(startParts('2026-07-02T10:00')).toEqual({ date: '2026-07-02', time: '10:00' });
     expect(startParts('')).toEqual({ date: '', time: '' });
diff --git a/client/src/components/Planner/reservationFormModel.ts b/client/src/components/Planner/reservationFormModel.ts
index 4a876a637..c1a3e8c58 100644
--- a/client/src/components/Planner/reservationFormModel.ts
+++ b/client/src/components/Planner/reservationFormModel.ts
@@ -164,6 +164,17 @@ export function isEndBeforeStart(form: DateFields): boolean {
   return `${form.end_date}T${endTime}` <= `${startDate}T${startTime}`;
 }
 
+/**
+ * Whether an end time without an end date comes before the start time, which saves
+ * as an end earlier on the start day. That only warns: with time zones (a flight
+ * landing "before" it took off) the times can be right as they are (#2604).
+ */
+export function endTimeBeforeStartTime(form: DateFields): boolean {
+  if (form.type === 'hotel' || form.end_date || !form.reservation_end_time) return false;
+  const startTime = (form.reservation_time || '').split('T')[1] || '';
+  return !!startTime && form.reservation_end_time < startTime;
+}
+
 /** The start's date and time as the two pickers show them. */
 export function startParts(reservationTime: string): { date: string; time: string } {
   const [date, time] = (reservationTime || '').split('T');
diff --git a/client/src/components/Planner/useReservationForm.test.ts b/client/src/components/Planner/useReservationForm.test.ts
index 72334f5c4..a98efd0e8 100644
--- a/client/src/components/Planner/useReservationForm.test.ts
+++ b/client/src/components/Planner/useReservationForm.test.ts
@@ -91,4 +91,15 @@ describe('useReservationForm', () => {
       endpoints: [],
     });
   });
+
+  it('FE-PLANNER-RESFORMHOOK-006: an end time before the start time on the same day raises the warning (#2604)', () => {
+    const { result } = renderHook(() => useReservationForm(EMPTY, days, places));
+    act(() => result.current.setStartTime('18:00', '2026-07-01'));
+    expect(result.current.endTimeBeforeStartTime).toBe(false);
+    act(() => result.current.set('reservation_end_time', '09:00'));
+    expect(result.current.endTimeBeforeStartTime).toBe(true);
+    expect(result.current.isEndBeforeStart).toBe(false);
+    act(() => result.current.set('end_date', '2026-07-02'));
+    expect(result.current.endTimeBeforeStartTime).toBe(false);
+  });
 });
diff --git a/client/src/components/Planner/useReservationForm.ts b/client/src/components/Planner/useReservationForm.ts
index 2d94a9018..d7db218b1 100644
--- a/client/src/components/Planner/useReservationForm.ts
+++ b/client/src/components/Planner/useReservationForm.ts
@@ -4,6 +4,7 @@ import type { Day, Place } from '../../types';
 import { toggledTraveler } from './bookingFormModel';
 import {
   type CheckInEndField,
+  endTimeBeforeStartTime,
   isEndBeforeStart,
   type ReservationFields,
   reservationSaveData,
@@ -56,6 +57,7 @@ export function useReservationForm<F extends ReservationFields & CheckInEndField
     setTravelerIds,
     toggleTraveler,
     isEndBeforeStart: isEndBeforeStart(form),
+    endTimeBeforeStartTime: endTimeBeforeStartTime(form),
     dateBounds,
     startDate: start.date,
     startTime: start.time,
diff --git a/client/src/mobile/screens/trip/sheets/MReservationSheet.tsx b/client/src/mobile/screens/trip/sheets/MReservationSheet.tsx
index 7c9eb9f2c..5b7b9b505 100644
--- a/client/src/mobile/screens/trip/sheets/MReservationSheet.tsx
+++ b/client/src/mobile/screens/trip/sheets/MReservationSheet.tsx
@@ -59,7 +59,7 @@ export default function MReservationSheet({ planner, onOpenExpense }: MReservati
 
   const {
     form, setForm, set, isSaving, setIsSaving, pendingFiles, setPendingFiles, travelerIds, setTravelerIds, toggleTraveler,
-    isEndBeforeStart, dateBounds, startDate, startTime, setStartDate, setStartTime, takeStopDay,
+    isEndBeforeStart, endTimeBeforeStartTime, dateBounds, startDate, startTime, setStartDate, setStartTime, takeStopDay,
     pickPlace, pickHotelPlace, pickHotelStart, pickHotelEnd, saveData: buildSaveData,
   } = useReservationForm(EMPTY, days, places)
   const assignmentOptions = useMemo(
@@ -252,6 +252,11 @@ export default function MReservationSheet({ planner, onOpenExpense }: MReservati
                 {t('reservations.validation.endBeforeStart')}
               </div>
             )}
+            {endTimeBeforeStartTime && (
+              <div className="mt-[6px] text-[0.6875rem] text-[color:var(--m-st-pending)]">
+                {t('reservations.validation.endTimeBeforeStartTime')}
+              </div>
+            )}
 
             {/* PLACE / ACTIVITY */}
             <Eyebrow className="mb-[5px] mt-3 uppercase">{t('reservations.meta.linkPlace')}</Eyebrow>
diff --git a/shared/src/i18n/ar/reservations.ts b/shared/src/i18n/ar/reservations.ts
index 68b092a42..2467e248b 100644
--- a/shared/src/i18n/ar/reservations.ts
+++ b/shared/src/i18n/ar/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'النهاية',
   'reservations.span.ongoing': 'جارٍ',
   'reservations.validation.endBeforeStart': 'يجب أن يكون تاريخ/وقت الانتهاء بعد تاريخ/وقت البدء',
+  'reservations.validation.endTimeBeforeStartTime': 'وقت الانتهاء قبل وقت البدء. إذا كان ينتهي في اليوم التالي، فحدّد تاريخ انتهاء.',
   'reservations.addBooking': 'إضافة حجز',
   'reservations.import.title': 'استيراد تأكيدات الحجز',
   'reservations.import.cta': 'استيراد من ملف',
diff --git a/shared/src/i18n/az/reservations.ts b/shared/src/i18n/az/reservations.ts
index c3f47deba..f987698d4 100644
--- a/shared/src/i18n/az/reservations.ts
+++ b/shared/src/i18n/az/reservations.ts
@@ -159,6 +159,7 @@ const reservations: TranslationStrings = {
   'reservations.span.ongoing': 'Davam edir',
 
   'reservations.validation.endBeforeStart': 'Bitmə tarixi və vaxtı başlanğıc tarixi və vaxtından sonra olmalıdır',
+  'reservations.validation.endTimeBeforeStartTime': 'Bitmə vaxtı başlanğıc vaxtından əvvəldir. Növbəti gün bitirsə, bitmə tarixi təyin edin.',
 
   'reservations.addBooking': 'Rezervasiya əlavə et',
 
diff --git a/shared/src/i18n/br/reservations.ts b/shared/src/i18n/br/reservations.ts
index db710bc81..e766aba46 100644
--- a/shared/src/i18n/br/reservations.ts
+++ b/shared/src/i18n/br/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Fim',
   'reservations.span.ongoing': 'Em andamento',
   'reservations.validation.endBeforeStart': 'A data/hora final deve ser posterior à data/hora inicial',
+  'reservations.validation.endTimeBeforeStartTime': 'O horário final é anterior ao inicial. Se terminar no dia seguinte, defina uma data final.',
   'reservations.addBooking': 'Adicionar reserva',
   'reservations.import.title': 'Importar confirmações de reserva',
   'reservations.import.cta': 'Importar de arquivo',
diff --git a/shared/src/i18n/ca/reservations.ts b/shared/src/i18n/ca/reservations.ts
index 00cd3623a..5a364f631 100644
--- a/shared/src/i18n/ca/reservations.ts
+++ b/shared/src/i18n/ca/reservations.ts
@@ -100,6 +100,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Fi',
   'reservations.span.ongoing': 'En curs',
   'reservations.validation.endBeforeStart': "La data/hora de fi ha de ser posterior a la d'inici",
+  'reservations.validation.endTimeBeforeStartTime': "L'hora de fi és anterior a la d'inici. Si acaba l'endemà, indica una data de fi.",
   'reservations.addBooking': 'Afegeix una reserva',
   'reservations.meta.airline': 'Aerolínia',
   'reservations.meta.flightNumber': 'Núm. de vol',
diff --git a/shared/src/i18n/cs/reservations.ts b/shared/src/i18n/cs/reservations.ts
index 4dcbfe916..e4097ff3d 100644
--- a/shared/src/i18n/cs/reservations.ts
+++ b/shared/src/i18n/cs/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Konec',
   'reservations.span.ongoing': 'Probíhá',
   'reservations.validation.endBeforeStart': 'Datum/čas konce musí být po datu/čase začátku',
+  'reservations.validation.endTimeBeforeStartTime': 'Čas konce je dříve než čas začátku. Pokud končí následující den, nastavte datum konce.',
   'reservations.addBooking': 'Přidat rezervaci',
   'reservations.import.title': 'Importovat potvrzení rezervace',
   'reservations.import.cta': 'Importovat ze souboru',
diff --git a/shared/src/i18n/de/reservations.ts b/shared/src/i18n/de/reservations.ts
index 7aacb409d..11664e3b4 100644
--- a/shared/src/i18n/de/reservations.ts
+++ b/shared/src/i18n/de/reservations.ts
@@ -134,6 +134,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Ende',
   'reservations.span.ongoing': 'Laufend',
   'reservations.validation.endBeforeStart': 'Enddatum/-zeit muss nach dem Startdatum/-zeit liegen',
+  'reservations.validation.endTimeBeforeStartTime': 'Die Endzeit liegt vor der Startzeit. Endet die Buchung am nächsten Tag, wähle ein Enddatum.',
   'reservations.addBooking': 'Buchung hinzufügen',
   'reservations.import.title': 'Buchungsbestätigungen importieren',
   'reservations.import.cta': 'Aus Datei importieren',
diff --git a/shared/src/i18n/en/reservations.ts b/shared/src/i18n/en/reservations.ts
index b38779437..a2626ee97 100644
--- a/shared/src/i18n/en/reservations.ts
+++ b/shared/src/i18n/en/reservations.ts
@@ -136,6 +136,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'End',
   'reservations.span.ongoing': 'Ongoing',
   'reservations.validation.endBeforeStart': 'End date/time must be after start date/time',
+  'reservations.validation.endTimeBeforeStartTime': 'The end time is before the start time. If it ends the next day, set an end date.',
   'reservations.addBooking': 'Add booking',
   'reservations.import.title': 'Import booking confirmations',
   'reservations.import.cta': 'Import from file',
diff --git a/shared/src/i18n/es/reservations.ts b/shared/src/i18n/es/reservations.ts
index 187070411..ba344eb48 100644
--- a/shared/src/i18n/es/reservations.ts
+++ b/shared/src/i18n/es/reservations.ts
@@ -100,6 +100,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Fin',
   'reservations.span.ongoing': 'En curso',
   'reservations.validation.endBeforeStart': 'La fecha/hora de fin debe ser posterior a la de inicio',
+  'reservations.validation.endTimeBeforeStartTime': 'La hora de fin es anterior a la de inicio. Si termina al día siguiente, indica una fecha de fin.',
   'reservations.addBooking': 'Añadir reserva',
   'reservations.meta.airline': 'Aerolínea',
   'reservations.meta.flightNumber': 'N° de vuelo',
diff --git a/shared/src/i18n/et/reservations.ts b/shared/src/i18n/et/reservations.ts
index 25334d04d..774eaffd3 100644
--- a/shared/src/i18n/et/reservations.ts
+++ b/shared/src/i18n/et/reservations.ts
@@ -136,6 +136,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Lõpp',
   'reservations.span.ongoing': 'Käimas',
   'reservations.validation.endBeforeStart': 'Lõppkuupäev ja -aeg peavad olema algusest hilisemad',
+  'reservations.validation.endTimeBeforeStartTime': 'Lõpuaeg on enne algusaega. Kui see lõpeb järgmisel päeval, määra lõppkuupäev.',
   'reservations.addBooking': 'Lisa broneering',
   'reservations.import.title': 'Impordi broneeringukinnitused',
   'reservations.import.cta': 'Impordi failist',
diff --git a/shared/src/i18n/fr/reservations.ts b/shared/src/i18n/fr/reservations.ts
index 158adb631..d62f0b2db 100644
--- a/shared/src/i18n/fr/reservations.ts
+++ b/shared/src/i18n/fr/reservations.ts
@@ -133,6 +133,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Fin',
   'reservations.span.ongoing': 'En cours',
   'reservations.validation.endBeforeStart': 'La date/heure de fin doit être postérieure à la date/heure de début',
+  'reservations.validation.endTimeBeforeStartTime': "L'heure de fin est antérieure à l'heure de début. Si elle se termine le lendemain, indiquez une date de fin.",
   'reservations.addBooking': 'Ajouter une réservation',
   'reservations.import.title': 'Importer des confirmations de réservation',
   'reservations.import.cta': 'Importer depuis un fichier',
diff --git a/shared/src/i18n/gr/reservations.ts b/shared/src/i18n/gr/reservations.ts
index 5a8133fa5..db5ec7076 100644
--- a/shared/src/i18n/gr/reservations.ts
+++ b/shared/src/i18n/gr/reservations.ts
@@ -133,6 +133,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Λήξη',
   'reservations.span.ongoing': 'Σε εξέλιξη',
   'reservations.validation.endBeforeStart': 'Η ημερομηνία/ώρα λήξης πρέπει να είναι μετά την ημερομηνία/ώρα έναρξης',
+  'reservations.validation.endTimeBeforeStartTime': 'Η ώρα λήξης είναι πριν από την ώρα έναρξης. Αν λήγει την επόμενη μέρα, ορίστε ημερομηνία λήξης.',
   'reservations.addBooking': 'Προσθήκη κράτησης',
   'reservations.import.title': 'Εισαγωγή επιβεβαιώσεων κράτησης',
   'reservations.import.cta': 'Εισαγωγή από αρχείο',
diff --git a/shared/src/i18n/hu/reservations.ts b/shared/src/i18n/hu/reservations.ts
index 7c1eef6cf..6b01944bd 100644
--- a/shared/src/i18n/hu/reservations.ts
+++ b/shared/src/i18n/hu/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Vége',
   'reservations.span.ongoing': 'Folyamatban',
   'reservations.validation.endBeforeStart': 'A befejezés dátuma/időpontja a kezdés utáni kell legyen',
+  'reservations.validation.endTimeBeforeStartTime': 'A befejezés időpontja a kezdés előtt van. Ha a következő napon ér véget, adj meg befejezési dátumot.',
   'reservations.addBooking': 'Foglalás hozzáadása',
   'reservations.import.title': 'Foglalási visszaigazolások importálása',
   'reservations.import.cta': 'Importálás fájlból',
diff --git a/shared/src/i18n/id/reservations.ts b/shared/src/i18n/id/reservations.ts
index 7a426e6e7..ac08a437d 100644
--- a/shared/src/i18n/id/reservations.ts
+++ b/shared/src/i18n/id/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Selesai',
   'reservations.span.ongoing': 'Berlangsung',
   'reservations.validation.endBeforeStart': 'Tanggal/waktu selesai harus setelah tanggal/waktu mulai',
+  'reservations.validation.endTimeBeforeStartTime': 'Waktu selesai lebih awal dari waktu mulai. Jika berakhir keesokan harinya, atur tanggal selesai.',
   'reservations.addBooking': 'Tambah pemesanan',
   'reservations.import.title': 'Impor konfirmasi pemesanan',
   'reservations.import.cta': 'Impor dari file',
diff --git a/shared/src/i18n/it/reservations.ts b/shared/src/i18n/it/reservations.ts
index 9aa79a958..c5c458a2d 100644
--- a/shared/src/i18n/it/reservations.ts
+++ b/shared/src/i18n/it/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Fine',
   'reservations.span.ongoing': 'In corso',
   'reservations.validation.endBeforeStart': 'La data/ora di fine deve essere successiva alla data/ora di inizio',
+  'reservations.validation.endTimeBeforeStartTime': "L'ora di fine è precedente all'ora di inizio. Se termina il giorno dopo, imposta una data di fine.",
   'reservations.addBooking': 'Aggiungi prenotazione',
   'reservations.import.title': 'Importa conferme di prenotazione',
   'reservations.import.cta': 'Importa da file',
diff --git a/shared/src/i18n/ja/reservations.ts b/shared/src/i18n/ja/reservations.ts
index 940278836..3120fb19a 100644
--- a/shared/src/i18n/ja/reservations.ts
+++ b/shared/src/i18n/ja/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': '終了',
   'reservations.span.ongoing': '進行中',
   'reservations.validation.endBeforeStart': '終了日時は開始日時より後である必要があります',
+  'reservations.validation.endTimeBeforeStartTime': '終了時刻が開始時刻より前です。翌日に終わる場合は終了日を設定してください。',
   'reservations.addBooking': '予約を追加',
   'reservations.import.title': '予約確認書のインポート',
   'reservations.import.cta': 'ファイルからインポート',
diff --git a/shared/src/i18n/ko/reservations.ts b/shared/src/i18n/ko/reservations.ts
index 28e67ad9c..90d6b78a6 100644
--- a/shared/src/i18n/ko/reservations.ts
+++ b/shared/src/i18n/ko/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': '종료',
   'reservations.span.ongoing': '진행 중',
   'reservations.validation.endBeforeStart': '종료 날짜/시간은 시작 날짜/시간 이후여야 합니다',
+  'reservations.validation.endTimeBeforeStartTime': '종료 시간이 시작 시간보다 이릅니다. 다음 날 끝나면 종료 날짜를 설정하세요.',
   'reservations.addBooking': '예약 추가',
   'reservations.import.title': '예약 확인서 가져오기',
   'reservations.import.cta': '파일에서 가져오기',
diff --git a/shared/src/i18n/nl/reservations.ts b/shared/src/i18n/nl/reservations.ts
index 1081ae784..5cc3466e4 100644
--- a/shared/src/i18n/nl/reservations.ts
+++ b/shared/src/i18n/nl/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Einde',
   'reservations.span.ongoing': 'Lopend',
   'reservations.validation.endBeforeStart': 'Einddatum/-tijd moet na de startdatum/-tijd liggen',
+  'reservations.validation.endTimeBeforeStartTime': 'De eindtijd ligt vóór de starttijd. Eindigt het de volgende dag, kies dan een einddatum.',
   'reservations.addBooking': 'Boeking toevoegen',
   'reservations.import.title': 'Boekingsbevestigingen importeren',
   'reservations.import.cta': 'Importeren vanuit bestand',
diff --git a/shared/src/i18n/pl/reservations.ts b/shared/src/i18n/pl/reservations.ts
index d2b7a6e36..f2c071fcb 100644
--- a/shared/src/i18n/pl/reservations.ts
+++ b/shared/src/i18n/pl/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Koniec',
   'reservations.span.ongoing': 'W trakcie',
   'reservations.validation.endBeforeStart': 'Data/godzina zakończenia musi być późniejsza niż data/godzina rozpoczęcia',
+  'reservations.validation.endTimeBeforeStartTime': 'Godzina zakończenia jest wcześniejsza niż godzina rozpoczęcia. Jeśli kończy się następnego dnia, ustaw datę zakończenia.',
   'reservations.addBooking': 'Dodaj rezerwację',
   'reservations.import.title': 'Importuj potwierdzenia rezerwacji',
   'reservations.import.cta': 'Importuj z pliku',
diff --git a/shared/src/i18n/ru/reservations.ts b/shared/src/i18n/ru/reservations.ts
index 8b4b613ff..bef16c550 100644
--- a/shared/src/i18n/ru/reservations.ts
+++ b/shared/src/i18n/ru/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Конец',
   'reservations.span.ongoing': 'Продолжается',
   'reservations.validation.endBeforeStart': 'Дата/время окончания должны быть позже даты/времени начала',
+  'reservations.validation.endTimeBeforeStartTime': 'Время окончания раньше времени начала. Если бронирование заканчивается на следующий день, укажите дату окончания.',
   'reservations.addBooking': 'Добавить бронирование',
   'reservations.import.title': 'Импорт подтверждений бронирования',
   'reservations.import.cta': 'Импортировать из файла',
diff --git a/shared/src/i18n/sk/reservations.ts b/shared/src/i18n/sk/reservations.ts
index 3d3477dc5..ed8ed0f64 100644
--- a/shared/src/i18n/sk/reservations.ts
+++ b/shared/src/i18n/sk/reservations.ts
@@ -137,6 +137,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Koniec',
   'reservations.span.ongoing': 'Prebieha',
   'reservations.validation.endBeforeStart': 'Dátum/čas konca musí byť po dátume/čase začiatku',
+  'reservations.validation.endTimeBeforeStartTime': 'Čas konca je skôr ako čas začiatku. Ak končí nasledujúci deň, nastavte dátum konca.',
   'reservations.addBooking': 'Pridať rezerváciu',
   'reservations.import.title': 'Importovať potvrdenia rezervácií',
   'reservations.import.cta': 'Importovať zo súboru',
diff --git a/shared/src/i18n/sv/reservations.ts b/shared/src/i18n/sv/reservations.ts
index a489065aa..f9bde02fb 100644
--- a/shared/src/i18n/sv/reservations.ts
+++ b/shared/src/i18n/sv/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Slut',
   'reservations.span.ongoing': 'Pågår',
   'reservations.validation.endBeforeStart': 'Slutdatum och -tid måste ligga efter startdatum och -tid',
+  'reservations.validation.endTimeBeforeStartTime': 'Sluttiden ligger före starttiden. Om den slutar nästa dag, ange ett slutdatum.',
   'reservations.addBooking': 'Lägg till bokning',
   'reservations.import.title': 'Importera bokningsbekräftelser',
   'reservations.import.cta': 'Importera från fil',
diff --git a/shared/src/i18n/th/reservations.ts b/shared/src/i18n/th/reservations.ts
index b0a3ed54b..b4e873eb0 100644
--- a/shared/src/i18n/th/reservations.ts
+++ b/shared/src/i18n/th/reservations.ts
@@ -136,6 +136,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'สิ้นสุด',
   'reservations.span.ongoing': 'กำลังดำเนินการอยู่',
   'reservations.validation.endBeforeStart': 'วันที่/เวลาสิ้นสุดต้องอยู่หลังวันที่/เวลาเริ่มต้น',
+  'reservations.validation.endTimeBeforeStartTime': 'เวลาสิ้นสุดอยู่ก่อนเวลาเริ่มต้น หากสิ้นสุดในวันถัดไป ให้กำหนดวันที่สิ้นสุด',
   'reservations.addBooking': 'เพิ่มการจอง',
   'reservations.import.title': 'นำเข้าการยืนยันการจอง',
   'reservations.import.cta': 'นำเข้าจากไฟล์',
diff --git a/shared/src/i18n/tr/reservations.ts b/shared/src/i18n/tr/reservations.ts
index 3c9017928..ea6586124 100644
--- a/shared/src/i18n/tr/reservations.ts
+++ b/shared/src/i18n/tr/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Son',
   'reservations.span.ongoing': 'Devam ediyor',
   'reservations.validation.endBeforeStart': 'Bitiş tarihi/saati başlangıçtan sonra olmalı',
+  'reservations.validation.endTimeBeforeStartTime': 'Bitiş saati başlangıç saatinden önce. Ertesi gün bitiyorsa bir bitiş tarihi belirleyin.',
   'reservations.addBooking': 'Rezervasyon ekle',
   'reservations.import.title': 'Rezervasyon onaylarını içe aktar',
   'reservations.import.cta': 'Dosyadan içe aktar',
diff --git a/shared/src/i18n/uk/reservations.ts b/shared/src/i18n/uk/reservations.ts
index cca068cef..ba302de8d 100644
--- a/shared/src/i18n/uk/reservations.ts
+++ b/shared/src/i18n/uk/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Кінець',
   'reservations.span.ongoing': 'Триває',
   'reservations.validation.endBeforeStart': 'Дата/час закінчення повинен бути пізніше дати/часу початку',
+  'reservations.validation.endTimeBeforeStartTime': 'Час закінчення раніший за час початку. Якщо бронювання закінчується наступного дня, вкажіть дату закінчення.',
   'reservations.addBooking': 'Додати бронювання',
   'reservations.import.title': 'Імпорт підтверджень бронювання',
   'reservations.import.cta': 'Імпортувати з файлу',
diff --git a/shared/src/i18n/vi/reservations.ts b/shared/src/i18n/vi/reservations.ts
index bd67673dc..bee121855 100644
--- a/shared/src/i18n/vi/reservations.ts
+++ b/shared/src/i18n/vi/reservations.ts
@@ -132,6 +132,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': 'Kết thúc',
   'reservations.span.ongoing': 'Đang thực hiện',
   'reservations.validation.endBeforeStart': 'Ngày/giờ kết thúc phải sau ngày/giờ bắt đầu',
+  'reservations.validation.endTimeBeforeStartTime': 'Giờ kết thúc sớm hơn giờ bắt đầu. Nếu kết thúc vào ngày hôm sau, hãy đặt ngày kết thúc.',
   'reservations.addBooking': 'Thêm đặt chỗ',
   'reservations.import.title': 'Nhập xác nhận đặt chỗ',
   'reservations.import.cta': 'Nhập từ tập tin',
diff --git a/shared/src/i18n/zh-TW/reservations.ts b/shared/src/i18n/zh-TW/reservations.ts
index 4b137d8db..0a4139e71 100644
--- a/shared/src/i18n/zh-TW/reservations.ts
+++ b/shared/src/i18n/zh-TW/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': '結束',
   'reservations.span.ongoing': '進行中',
   'reservations.validation.endBeforeStart': '結束日期/時間必須晚於開始日期/時間',
+  'reservations.validation.endTimeBeforeStartTime': '結束時間早於開始時間。如果在隔天結束，請設定結束日期。',
   'reservations.addBooking': '新增預訂',
   'reservations.import.title': '匯入訂位確認',
   'reservations.import.cta': '從檔案匯入',
diff --git a/shared/src/i18n/zh/reservations.ts b/shared/src/i18n/zh/reservations.ts
index 343c86293..9a9d0a41f 100644
--- a/shared/src/i18n/zh/reservations.ts
+++ b/shared/src/i18n/zh/reservations.ts
@@ -131,6 +131,7 @@ const reservations: TranslationStrings = {
   'reservations.span.end': '结束',
   'reservations.span.ongoing': '进行中',
   'reservations.validation.endBeforeStart': '结束日期/时间必须晚于开始日期/时间',
+  'reservations.validation.endTimeBeforeStartTime': '结束时间早于开始时间。如果在次日结束，请设置结束日期。',
   'reservations.addBooking': '添加预订',
   'reservations.import.title': '导入预订确认',
   'reservations.import.cta': '从文件导入',