diff --git a/server/src/db/reseat-booked-nights.ts b/server/src/db/reseat-booked-nights.ts
index 458e969ed..cfe904449 100644
--- a/server/src/db/reseat-booked-nights.ts
+++ b/server/src/db/reseat-booked-nights.ts
@@ -31,10 +31,13 @@ export function reseatBookedNights(db: Database.Database): number {
     JOIN day_accommodations a ON a.id = da.accommodation_id
     ORDER BY da.day_id, da.order_index, da.id
   `).all() as Array<{ id: number; day_id: number; check_in: string | null }>;
+  // Another night on the same day counts by its check-in, so two bookings on one
+  // day settle by the clock instead of by whichever was seated last.
   const dayRows = db.prepare(`
-    SELECT da.id, COALESCE(da.assignment_time, p.place_time) AS at,
+    SELECT da.id, COALESCE(da.assignment_time, p.place_time, other.check_in) AS at,
            (p.lat IS NOT NULL AND p.lng IS NOT NULL) AS located
     FROM day_assignments da JOIN places p ON p.id = da.place_id
+    LEFT JOIN day_accommodations other ON other.id = da.accommodation_id
     WHERE da.day_id = ?
     ORDER BY da.order_index ASC, da.created_at ASC, da.id ASC
   `);
diff --git a/server/src/nest/accommodations/accommodations.service.ts b/server/src/nest/accommodations/accommodations.service.ts
index 1d0eade62..a7403fe7d 100644
--- a/server/src/nest/accommodations/accommodations.service.ts
+++ b/server/src/nest/accommodations/accommodations.service.ts
@@ -296,9 +296,12 @@ export class AccommodationsService {
     if (!checkIn) return 0;
     // excludeId leaves the row being re-seated out of the chain it is measured
     // against. Without it a night parked at the end of the day can find itself.
+    // Another booked night on the day counts by its check-in, so two bookings on
+    // one day settle by the clock.
     const rows = this.db.all<{ order_index: number; at: string | null }>(`
-      SELECT da.order_index, COALESCE(da.assignment_time, p.place_time) AS at
+      SELECT da.order_index, COALESCE(da.assignment_time, p.place_time, other.check_in) AS at
       FROM day_assignments da JOIN places p ON p.id = da.place_id
+      LEFT JOIN day_accommodations other ON other.id = da.accommodation_id
       WHERE da.day_id = ? AND da.id != ? ORDER BY da.order_index
     `, dayId, excludeId ?? -1);
     let seat = 0;
@@ -319,8 +322,9 @@ export class AccommodationsService {
   private seatedByCheckIn(dayId: number, ownId: number, checkIn: string | null | undefined): boolean {
     if (!checkIn) return true;
     const rows = this.db.all<{ id: number; at: string | null }>(`
-      SELECT da.id, COALESCE(da.assignment_time, p.place_time) AS at
+      SELECT da.id, COALESCE(da.assignment_time, p.place_time, other.check_in) AS at
       FROM day_assignments da JOIN places p ON p.id = da.place_id
+      LEFT JOIN day_accommodations other ON other.id = da.accommodation_id
       WHERE da.day_id = ? ORDER BY da.order_index
     `, dayId);
     const own = rows.findIndex(row => row.id === ownId);
diff --git a/server/tests/unit/db/booked-night-reseat.test.ts b/server/tests/unit/db/booked-night-reseat.test.ts
index 14246ef25..58797af18 100644
--- a/server/tests/unit/db/booked-night-reseat.test.ts
+++ b/server/tests/unit/db/booked-night-reseat.test.ts
@@ -177,6 +177,18 @@ describe('booked night reseat', () => {
     expect(vias(db).map((v) => v.id)).not.toContain(afterA);
   });
 
+  it('RESEAT-010: two nights on one day settle by their check-ins', () => {
+    const db = freshDb();
+    const [later, earlier] = [place(db, 'Rue de Paris'), place(db, 'Brandenburger Tor')];
+    stop(db, later, 0, null, night(db, later, '12:00'));
+    stop(db, earlier, 1, null, night(db, earlier, '10:00'));
+
+    reseatBookedNights(db);
+
+    expect(order(db)).toEqual([earlier, later]);
+    expect(reseatBookedNights(db)).toBe(0);
+  });
+
   it('RESEAT-008: runs again without moving anything', () => {
     const db = freshDb();
     const [fuel, hotel] = [place(db, 'Aral'), place(db, 'Rostock')];
diff --git a/server/tests/unit/nest/accommodations.service.test.ts b/server/tests/unit/nest/accommodations.service.test.ts
index 758a363d1..d017e2332 100644
--- a/server/tests/unit/nest/accommodations.service.test.ts
+++ b/server/tests/unit/nest/accommodations.service.test.ts
@@ -743,6 +743,20 @@ describe('the day stop a booking implies', () => {
     expect(stopsOn(day.id).map(a => a.place_id)).toEqual([afternoon.id, hotel.id]);
   });
 
+  it('ACC-022i a second night on the day counts by its check-in', () => {
+    const { user } = createUser(testDb);
+    const trip = createTrip(testDb, user.id);
+    const day = createDay(testDb, trip.id);
+    const [noon, morning] = ['Rue de Paris', 'Brandenburger Tor'].map(name => createPlace(testDb, trip.id, { name }));
+    svc.createAccommodation(trip.id, { place_id: noon.id, start_day_id: day.id, end_day_id: day.id, check_in: '12:00' });
+    svc.createAccommodation(trip.id, { place_id: morning.id, start_day_id: day.id, end_day_id: day.id, check_in: '10:00' });
+    expect(stopsOn(day.id).map(a => a.place_id)).toEqual([morning.id, noon.id]);
+
+    const evening = createPlace(testDb, trip.id, { name: 'Late' });
+    svc.createAccommodation(trip.id, { place_id: evening.id, start_day_id: day.id, end_day_id: day.id, check_in: '18:00' });
+    expect(stopsOn(day.id).map(a => a.place_id)).toEqual([morning.id, noon.id, evening.id]);
+  });
+
   it('ACC-022h an edit that leaves the check-in alone still corrects a night the clocks contradict', () => {
     // Dragged behind a stop pinned to the afternoon, with a check-in at ten: a change of
     // notes puts it back ahead of that stop, because a night sitting after an afternoon it