diff --git a/dataExample.json b/dataExample.json
index e8db07f..2f7a0fc 100644
--- a/dataExample.json
+++ b/dataExample.json
@@ -3,11 +3,9 @@
     {
       "events": [
         {
-          "time": 0,
           "lessons": [0, 1, 2, 3, 4, 5]
         },
         {
-          "time": 1,
           "lessons": [0, 1, 2, 3, 4, 5]
         }
       ],
diff --git a/src/hooks.ts b/src/hooks.ts
index 9815d76..71e2a36 100644
--- a/src/hooks.ts
+++ b/src/hooks.ts
@@ -4,22 +4,62 @@ import {
   UseTimetableHookFT,
   CreateCardFT,
   CreateSubjectFT,
+  CreateDayFT,
+  AddEventFT,
+  AddLessonFT,
+  DayT,
+  CardT,
+  SubjectT,
 } from "./types/timetable";
+import { initialEventLessonsGenrator } from './utils/timetable'
 
 export const useTimetable: UseTimetableHookFT = () => {
-  const [state, setState] = useState<TimetableT>({
-    cards: [],
-    days: [],
-    subjects: [],
-  });
+  const [cardState, setCardState] = useState<CardT[]>([])
+  const [dayState, setDayState] = useState<DayT[]>([])
+  const [subjectState, setSubjectState] = useState<SubjectT[]>([])
+  // const [startDateState, setStartDateState] = useState<number>(0)
 
-  const createSubject: CreateSubjectFT = () => {
-    console.log();
+  const createSubject: CreateSubjectFT = (title, teachers) => {
+    setSubjectState((prev) => ([...prev, { title, teachers }]))
   };
 
-  const createCard: CreateCardFT = () => {
-    console.log();
+  const createCard: CreateCardFT = (subject, teacher, room) => {
+    setCardState((prev) => ([...prev, { subject, teacher, room }]))
   };
 
-  return { state, createCard, createSubject };
+  const createDay: CreateDayFT = (date) => {
+    setDayState((prev) => [...prev, { date, events: [] }])
+  }
+
+  const addEvent: AddEventFT = (dayId) => {
+    setDayState((days) => days.map((day, i) => (i == dayId) ? { ...day, events: [...day.events, { lessons: initialEventLessonsGenrator() }] } : day))
+  }
+
+  const addLesson: AddLessonFT = (dayId, eventId, groupId, isPair, lessonId, lessonNumber) => {
+    setDayState((days) => days.map(
+      (day, dayIndex) => (
+        (dayIndex == dayId) ? {
+          ...day,
+          events: day.events.map(
+            (event, eventIndex) => (
+              (eventIndex == eventId) ? {
+                lessons: event.lessons.map(
+                  (lesson, lessonIndex) => (
+                    (lessonIndex == groupId) ? (
+                      (isPair) ? [lessonId, lessonId] : lesson.map((lessonElement, lessonElementIndex) => (
+                        (lessonElementIndex == lessonNumber) ? lessonId : lessonElement
+                      ))
+                    ) : lesson
+                  )
+                )
+              } : event
+            )
+          )
+        } : day
+      )
+    ))
+  }
+
+
+  return { state: { cards: cardState, subjects: subjectState, days: dayState }, createCard, createSubject, createDay, addLesson };
 };
diff --git a/src/types/timetable.ts b/src/types/timetable.ts
index eefbbf9..2b8d64d 100644
--- a/src/types/timetable.ts
+++ b/src/types/timetable.ts
@@ -4,22 +4,22 @@ export type TimetableT = {
   subjects: SubjectT[];
 };
 
-type DayT = {
+export type DayT = {
   events: EventT[];
   date: number; // epoch time
 };
 
 type EventT = {
-  lessons: number[]; // IDs
+  lessons: number[][]; // IDs
 };
 
-type CardT = {
+export type CardT = {
   subject: number; // ID
   room: number; // Number
   teacher: number; // ID in subject
 };
 
-type SubjectT = {
+export type SubjectT = {
   title: string;
   teachers: string[]; // teachers allowed for this subject
 };
@@ -27,13 +27,20 @@ type SubjectT = {
 export type CreateSubjectFT = (title: string, teachers: string[]) => void;
 
 export type CreateCardFT = (
-  subjectID: number,
-  teacherID: number,
+  subject: number,
+  teacher: number,
   room: number
 ) => void;
 
+export type CreateDayFT = (date: number) => void;
+
+export type AddEventFT = (dayId: number) => void;
+
+export type AddLessonFT = (dayId: number, eventId: number, groupId:number, isPair: boolean, lessonId: number, lessonNumber?: number) => void;
+
 export type UseTimetableHookFT = () => {
   createSubject: CreateSubjectFT;
   createCard: CreateCardFT;
+  createDay: CreateCardFT;
   state: TimetableT;
 };
diff --git a/src/utils/timetable.ts b/src/utils/timetable.ts
new file mode 100644
index 0000000..97126ee
--- /dev/null
+++ b/src/utils/timetable.ts
@@ -0,0 +1,2 @@
+export const initialEventLessonsGenrator = () =>
+	Array(6).map<number[]>(() => [0, 0])
\ No newline at end of file