diff --git a/client/src/App.tsx b/client/src/App.tsx
index 5cb3454..6725bc5 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -15,7 +15,7 @@ import { useSettings } from './context/settings';
 import Footer from './components/Footer';
 import { faChainBroken, faChevronLeft, faChevronRight, faGear, faSatelliteDish, faSearch } from '@fortawesome/free-solid-svg-icons';
 import Loader from './components/Loader';
-import { getHumanDateTime, isInTheFuture } from './Utils';
+import { getDayOfWeekIndex, getHumanDate, getHumanDateTime, getIsWeekend, isInTheFuture } from './Utils';
 import NoteModal from './components/modals/NoteModal';
 import { useEasterEgg } from './context/eggs';
 import { ClientData, Food, PizzaOrder, DepartureTime, PizzaDayState, Restaurant, RestaurantDayMenu, RestaurantDayMenuMap, LunchChoice, UserLunchChoice, PizzaVariant, getData, getEasterEggImage, addPizza, removePizza, updatePizzaDayNote, createPizzaDay, deletePizzaDay, lockPizzaDay, unlockPizzaDay, finishOrder, finishDelivery, addChoice, jdemeObed, removeChoices, removeChoice, updateNote, changeDepartureTime } from '../../types';
@@ -71,7 +71,10 @@ function App() {
   const departureChoiceRef = useRef<HTMLSelectElement>(null);
   const pizzaPoznamkaRef = useRef<HTMLInputElement>(null);
   const [failure, setFailure] = useState<boolean>(false);
-  const [dayIndex, setDayIndex] = useState<number>();
+  const [dayIndex, setDayIndex] = useState<number>(); // Index zobrazovaného dne
+  // TODO berka zde je nutné dořešit mocking pro testování
+  const [todayDayIndex, setTodayDayIndex] = useState<number>(getDayOfWeekIndex(new Date())); // Index dnešního dne
+  const [isTodayWeekend, setIsTodayWeekend] = useState<boolean>(getIsWeekend(new Date()));
   const [loadingPizzaDay, setLoadingPizzaDay] = useState<boolean>(false);
   const [noteModalOpen, setNoteModalOpen] = useState<boolean>(false);
   const [eggImage, setEggImage] = useState<Blob>();
@@ -89,8 +92,9 @@ function App() {
       const data = response.data
       if (data) {
         setData(data);
-        setDayIndex(data.dayIndex);
-        dayIndexRef.current = data.dayIndex;
+        const dayIndex = getDayOfWeekIndex(new Date(data.date));
+        setDayIndex(dayIndex);
+        dayIndexRef.current = dayIndex;
         setFood(data.menus);
       }
     }).catch(e => {
@@ -103,6 +107,8 @@ function App() {
     if (!auth?.login) {
       return
     }
+    setTodayDayIndex(getDayOfWeekIndex(new Date()));
+    setIsTodayWeekend(getIsWeekend(new Date()));
     getData({ query: { dayIndex: dayIndex } }).then(response => {
       const data = response.data;
       setData(data);
@@ -125,7 +131,7 @@ function App() {
     socket.on(EVENT_MESSAGE, (newData: ClientData) => {
       // console.log("Přijata nová data ze socketu", newData);
       // Aktualizujeme pouze, pokud jsme dostali data pro den, který máme aktuálně zobrazený
-      if (dayIndexRef.current == null || newData.dayIndex === dayIndexRef.current) {
+      if (dayIndexRef.current == null || getDayOfWeekIndex(new Date(newData.date)) === dayIndexRef.current) {
         setData(newData);
       }
     });
@@ -439,7 +445,7 @@ function App() {
   }
 
   const noOrders = data?.pizzaDay?.orders?.length === 0;
-  const canChangeChoice = dayIndex == null || data.todayDayIndex == null || dayIndex >= data.todayDayIndex;
+  const canChangeChoice = dayIndex == null || dayIndex >= todayDayIndex;
 
   const { path, url, startOffset, endOffset, duration, ...style } = easterEgg || {};
 
@@ -448,7 +454,7 @@ function App() {
       {easterEgg && eggImage && <img ref={eggRef} alt='' src={URL.createObjectURL(eggImage)} style={{ position: 'absolute', ...EASTER_EGG_STYLE, ...style, animationDuration: `${duration ?? EASTER_EGG_DEFAULT_DURATION}s` }} />}
       <Header />
       <div className='wrapper'>
-        {data.isWeekend ? <h4>Užívejte víkend :)</h4> : <>
+        {isTodayWeekend ? <h4>Užívejte víkend :)</h4> : <>
           <Alert variant={'primary'}>
             {/* <img alt="" src='hat.png' style={{ position: "absolute", width: "70px", rotate: "-45deg", left: -40, top: -58 }} />
             <img alt="" src='snowman.png' style={{ position: "absolute", height: "110px", right: 10, top: 5 }} /> */}
@@ -464,7 +470,7 @@ function App() {
               <span title='Předchozí den'>
                 <FontAwesomeIcon icon={faChevronLeft} style={{ cursor: "pointer", visibility: dayIndex > 0 ? "initial" : "hidden" }} onClick={() => handleDayChange(dayIndex - 1)} />
               </span>
-              <h1 className='title' style={{ color: dayIndex === data.todayDayIndex ? 'black' : 'gray' }}>{data.date}</h1>
+              <h1 className='title' style={{ color: dayIndex === todayDayIndex ? 'black' : 'gray' }}>{getHumanDate(new Date(data.date))}</h1>
               <span title="Následující den">
                 <FontAwesomeIcon icon={faChevronRight} style={{ cursor: "pointer", visibility: dayIndex < 4 ? "initial" : "hidden" }} onClick={() => handleDayChange(dayIndex + 1)} />
               </span>
@@ -480,7 +486,7 @@ function App() {
           <div className='content-wrapper'>
             <div className='content'>
               {canChangeChoice && <>
-                <p>{`Jak to ${dayIndex == null || dayIndex === data.todayDayIndex ? 'dnes' : 'tento den'} vidíš s obědem?`}</p>
+                <p>{`Jak to ${dayIndex == null || dayIndex === todayDayIndex ? 'dnes' : 'tento den'} vidíš s obědem?`}</p>
                 <Form.Select ref={choiceRef} onChange={doAddChoice}>
                   <option></option>
                   {Object.entries(LunchChoice)
@@ -589,7 +595,7 @@ function App() {
                 : <div className='mt-5'><i>Zatím nikdo nehlasoval...</i></div>
               }
             </div>
-            {dayIndex === data.todayDayIndex &&
+            {dayIndex === todayDayIndex &&
               <div className='mt-5'>
                 {!data.pizzaDay &&
                   <div style={{ textAlign: 'center' }}>
diff --git a/client/src/Utils.tsx b/client/src/Utils.tsx
index 4d081dc..f35dfb6 100644
--- a/client/src/Utils.tsx
+++ b/client/src/Utils.tsx
@@ -73,6 +73,12 @@ export const getDayOfWeekIndex = (date: Date) => {
     return (((date.getDay() - 1) % 7) + 7) % 7;
 }
 
+/** Vrátí true, pokud je předané datum o víkendu. */
+export function getIsWeekend(date: Date) {
+    const index = getDayOfWeekIndex(date);
+    return index == 5 || index == 6;
+}
+
 /** Vrátí první pracovní den v týdnu předaného data. */
 export function getFirstWorkDayOfWeek(date: Date) {
     const firstDay = new Date(date.getTime());
diff --git a/server/src/service.ts b/server/src/service.ts
index f084932..99cedb8 100644
--- a/server/src/service.ts
+++ b/server/src/service.ts
@@ -1,4 +1,4 @@
-import { InsufficientPermissions, formatDate, getDayOfWeekIndex, getFirstWorkDayOfWeek, getHumanDate, getIsWeekend, getWeekNumber } from "./utils";
+import { InsufficientPermissions, formatDate, getDayOfWeekIndex, getFirstWorkDayOfWeek, getIsWeekend, getWeekNumber } from "./utils";
 import getStorage from "./storage";
 import { getMenuSladovnicka, getMenuTechTower, getMenuZastavkaUmichala, getMenuSenkSerikova } from "./restaurants";
 import { getTodayMock } from "./mock";
@@ -31,10 +31,7 @@ export const getDateForWeekIndex = (index: number) => {
 function getEmptyData(date?: Date): ClientData {
     const usedDate = date || getToday();
     return {
-        todayDayIndex: getDayOfWeekIndex(getToday()),
-        date: getHumanDate(usedDate),
-        isWeekend: getIsWeekend(usedDate),
-        dayIndex: getDayOfWeekIndex(usedDate),
+        date: usedDate.toISOString().split('T')[0],
         choices: {},
     };
 }
@@ -486,9 +483,5 @@ export async function updateDepartureTime(login: string, time?: string, date?: D
 export async function getClientData(date?: Date): Promise<ClientData> {
     const targetDate = date ?? getToday();
     const dateString = formatDate(targetDate);
-    const clientData = await storage.getData<ClientData>(dateString) || getEmptyData(date);
-    return {
-        ...clientData,
-        todayDayIndex: getDayOfWeekIndex(getToday()),
-    }
+    return await storage.getData<ClientData>(dateString) || getEmptyData(date);
 }
\ No newline at end of file
diff --git a/types/schemas/_index.yml b/types/schemas/_index.yml
index b4be218..d74f723 100644
--- a/types/schemas/_index.yml
+++ b/types/schemas/_index.yml
@@ -21,23 +21,13 @@ ClientData:
   type: object
   additionalProperties: false
   required:
-    - todayDayIndex
     - date
-    - isWeekend
     - choices
   properties:
-    todayDayIndex:
-      description: Index dnešního dne v týdnu
-      $ref: "#/DayIndex"
     date:
-      description: Human-readable datum dne
+      description: Datum konkrétního dne
       type: string
-    isWeekend:
-      description: Příznak, zda je tento den víkend
-      type: boolean
-    dayIndex:
-      description: Index dne v týdnu, ke kterému se vztahují tato data
-      $ref: "#/DayIndex"
+      format: date
     choices:
       $ref: "#/LunchChoices"
     menus: