diff --git a/Core/Core/View/Base/CalendarManagerProtocol.swift b/Core/Core/View/Base/CalendarManagerProtocol.swift
index fead58f02..ef7fdcb3e 100644
--- a/Core/Core/View/Base/CalendarManagerProtocol.swift
+++ b/Core/Core/View/Base/CalendarManagerProtocol.swift
@@ -16,8 +16,10 @@ public protocol CalendarManagerProtocol {
     func requestAccess() async -> Bool
     func courseStatus(courseID: String) -> SyncStatus
     func clearAllData(removeCalendar: Bool)
+    func isDatesChanged(courseID: String, checksum: String) -> Bool
 }
 
+#if DEBUG
 public struct CalendarManagerMock: CalendarManagerProtocol {
     public func createCalendarIfNeeded() {}
     public func filterCoursesBySelected(fetchedCourses: [CourseForSync]) async -> [CourseForSync] {[]}
@@ -27,6 +29,8 @@ public struct CalendarManagerMock: CalendarManagerProtocol {
     public func requestAccess() async -> Bool { true }
     public func courseStatus(courseID: String) -> SyncStatus { .synced }
     public func clearAllData(removeCalendar: Bool) {}
+    public func isDatesChanged(courseID: String, checksum: String) -> Bool {false}
     
     public init() {}
 }
+#endif
diff --git a/Course/Course/Presentation/Container/CourseContainerView.swift b/Course/Course/Presentation/Container/CourseContainerView.swift
index 6734d05bb..64f6fd88c 100644
--- a/Course/Course/Presentation/Container/CourseContainerView.swift
+++ b/Course/Course/Presentation/Container/CourseContainerView.swift
@@ -200,7 +200,7 @@ public struct CourseContainerView: View {
                         selection: $viewModel.selection,
                         coordinate: $coordinate,
                         collapsed: $collapsed,
-                        dateTabIndex: 1//CourseTab.dates.rawValue
+                        dateTabIndex: CourseTab.dates.rawValue
                     )
                     .tabItem {
                         tab.image
diff --git a/OpenEdX/DI/AppAssembly.swift b/OpenEdX/DI/AppAssembly.swift
index 732654679..f6a970797 100644
--- a/OpenEdX/DI/AppAssembly.swift
+++ b/OpenEdX/DI/AppAssembly.swift
@@ -99,14 +99,6 @@ class AppAssembly: Assembly {
                             connectivity: r.resolve(ConnectivityProtocol.self)!)
         }).inObjectScope(.container)
         
-        container.register(CalendarManager.self) { r in
-            CalendarManager(
-                persistence: r.resolve(ProfilePersistenceProtocol.self)!,
-                interactor: r.resolve(ProfileInteractorProtocol.self)!,
-                profileStorage: r.resolve(ProfileStorage.self)!
-            )
-        }.inObjectScope(.container)
-        
         container.register(AuthorizationRouter.self) { r in
             r.resolve(Router.self)!
         }.inObjectScope(.container)
@@ -193,7 +185,7 @@ class AppAssembly: Assembly {
                 profileStorage: r.resolve(ProfileStorage.self)!
             )
         }
-        .inObjectScope(.weak)
+        .inObjectScope(.container)
 
         container.register(DeepLinkManager.self) { r in
             DeepLinkManager(
diff --git a/OpenEdX/DI/ScreenAssembly.swift b/OpenEdX/DI/ScreenAssembly.swift
index ad6ce6713..f76ef7808 100644
--- a/OpenEdX/DI/ScreenAssembly.swift
+++ b/OpenEdX/DI/ScreenAssembly.swift
@@ -41,7 +41,7 @@ class ScreenAssembly: Assembly {
                 config: r.resolve(ConfigProtocol.self)!,
                 profileInteractor: r.resolve(ProfileInteractorProtocol.self)!,
                 appStorage: r.resolve(AppStorage.self)!, 
-                calendarManager: r.resolve(CalendarManager.self)!,
+                calendarManager: r.resolve(CalendarManagerProtocol.self)!,
                 sourceScreen: sourceScreen
             )
         }
@@ -246,7 +246,7 @@ class ScreenAssembly: Assembly {
                 interactor: r.resolve(ProfileInteractorProtocol.self)!,
                 profileStorage: r.resolve(ProfileStorage.self)!,
                 persistence: r.resolve(ProfilePersistenceProtocol.self)!,
-                calendarManager: r.resolve(CalendarManager.self)!,
+                calendarManager: r.resolve(CalendarManagerProtocol.self)!,
                 connectivity: r.resolve(ConnectivityProtocol.self)!
             )
         }
diff --git a/OpenEdX/Data/ProfilePersistence.swift b/OpenEdX/Data/ProfilePersistence.swift
index d28cb4cca..9b37befc9 100644
--- a/OpenEdX/Data/ProfilePersistence.swift
+++ b/OpenEdX/Data/ProfilePersistence.swift
@@ -86,7 +86,6 @@ public class ProfilePersistence: ProfilePersistenceProtocol {
     }
     
     public func deleteAllCourseStatesAndEvents() {
-
         let fetchRequestCalendarStates: NSFetchRequest<NSFetchRequestResult> = CDCourseCalendarState.fetchRequest()
         let deleteRequestCalendarStates = NSBatchDeleteRequest(fetchRequest: fetchRequestCalendarStates)
         let fetchRequestCalendarEvents: NSFetchRequest<NSFetchRequestResult> = CDCourseCalendarEvent.fetchRequest()
diff --git a/OpenEdX/View/MainScreenView.swift b/OpenEdX/View/MainScreenView.swift
index df8d8d70a..72fa66b56 100644
--- a/OpenEdX/View/MainScreenView.swift
+++ b/OpenEdX/View/MainScreenView.swift
@@ -184,7 +184,6 @@ struct MainScreenView: View {
                 await viewModel.prefetchDataForOffline()
                 await viewModel.loadCalendar()
             }
-            viewModel.addShiftCourseDatesObserver()
         }
         .accentColor(Theme.Colors.accentXColor)
     }
diff --git a/OpenEdX/View/MainScreenViewModel.swift b/OpenEdX/View/MainScreenViewModel.swift
index 59ce1ccd0..740d0fd93 100644
--- a/OpenEdX/View/MainScreenViewModel.swift
+++ b/OpenEdX/View/MainScreenViewModel.swift
@@ -25,7 +25,7 @@ final class MainScreenViewModel: ObservableObject {
     private let profileInteractor: ProfileInteractorProtocol
     var sourceScreen: LogistrationSourceScreen
     private var appStorage: CoreStorage & ProfileStorage
-    private let calendarManager: CalendarManager
+    private let calendarManager: CalendarManagerProtocol
     private var cancellables = Set<AnyCancellable>()
     
     @Published var selection: MainTab = .dashboard
@@ -34,7 +34,7 @@ final class MainScreenViewModel: ObservableObject {
          config: ConfigProtocol,
          profileInteractor: ProfileInteractorProtocol,
          appStorage: CoreStorage & ProfileStorage,
-         calendarManager: CalendarManager,
+         calendarManager: CalendarManagerProtocol,
          sourceScreen: LogistrationSourceScreen = .default
     ) {
         self.analytics = analytics
@@ -43,6 +43,15 @@ final class MainScreenViewModel: ObservableObject {
         self.appStorage = appStorage
         self.calendarManager = calendarManager
         self.sourceScreen = sourceScreen
+        
+        NotificationCenter.default.publisher(for: .shiftCourseDates, object: nil)
+            .sink { notification in
+                guard let (courseID, courseName) = notification.object as? (String, String) else { return }
+                Task {
+                    await self.updateCourseDates(courseID: courseID, courseName: courseName)
+                }
+            }
+            .store(in: &cancellables)
     }
     
     public func select(tab: MainTab) {
@@ -74,17 +83,6 @@ final class MainScreenViewModel: ObservableObject {
             await updateCalendarIfNeeded(for: username)
         }
     }
-    
-    func addShiftCourseDatesObserver() {
-        NotificationCenter.default.publisher(for: .shiftCourseDates, object: nil)
-            .sink { notification in
-                guard let (courseID, courseName) = notification.object as? (String, String) else { return }
-                Task {
-                    await self.updateCourseDates(courseID: courseID, courseName: courseName)
-                }
-            }
-            .store(in: &cancellables)
-    }
 }
 
 extension MainScreenViewModel {
diff --git a/Profile/Profile/Data/Network/ProfileEndpoint.swift b/Profile/Profile/Data/Network/ProfileEndpoint.swift
index a30ec4c2a..a72264ebd 100644
--- a/Profile/Profile/Data/Network/ProfileEndpoint.swift
+++ b/Profile/Profile/Data/Network/ProfileEndpoint.swift
@@ -21,7 +21,7 @@ enum ProfileEndpoint: EndPointType {
 
     var path: String {
         switch self {
-        case .getUserProfile(let username):
+        case let .getUserProfile(username):
             return "/api/user/v1/accounts/\(username)"
         case .logOut:
             return "/oauth2/revoke_token/"
@@ -29,13 +29,13 @@ enum ProfileEndpoint: EndPointType {
             return "/api/user/v1/accounts/\(username)"
         case let .uploadProfilePicture(username, _):
             return "/api/user/v1/accounts/\(username)/image"
-        case .deleteProfilePicture(username: let username):
+        case let .deleteProfilePicture(username):
             return "/api/user/v1/accounts/\(username)/image"
         case .deleteAccount:
             return "/api/user/v1/accounts/deactivate_logout/"
         case let .enrollmentsStatus(username):
             return "/api/mobile/v1/users/\(username)/enrollments_status/"
-        case .getCourseDates(let courseID):
+        case let .getCourseDates(courseID):
             return "/api/course_home/v1/dates/\(courseID)"
         }
     }
@@ -88,12 +88,12 @@ enum ProfileEndpoint: EndPointType {
                 "username": username
             ]
             return .requestParameters(parameters: params, encoding: JSONEncoding.default)
-        case .deleteAccount(password: let password):
+        case let .deleteAccount(password):
             let params: [String: String] = [
                 "password": password
             ]
             return .requestParameters(parameters: params, encoding: URLEncoding.httpBody)
-        case .enrollmentsStatus(username: let username):
+        case let .enrollmentsStatus(username):
             return .requestParameters(parameters: nil, encoding: JSONEncoding.default)
         case .getCourseDates:
             return .requestParameters(encoding: JSONEncoding.default)
diff --git a/Profile/Profile/Data/Persistence/ProfilePersistenceProtocol.swift b/Profile/Profile/Data/Persistence/ProfilePersistenceProtocol.swift
index bfbdebd84..3e26799bd 100644
--- a/Profile/Profile/Data/Persistence/ProfilePersistenceProtocol.swift
+++ b/Profile/Profile/Data/Persistence/ProfilePersistenceProtocol.swift
@@ -20,6 +20,7 @@ public protocol ProfilePersistenceProtocol {
     func getCourseCalendarEvents(for courseId: String) -> [CourseCalendarEvent]
 }
 
+#if DEBUG
 public struct ProfilePersistenceMock: ProfilePersistenceProtocol {
     public func getCourseState(courseID: String) -> CourseCalendarState? { nil }
     public func getAllCourseStates() -> [CourseCalendarState] {[]}
@@ -31,6 +32,7 @@ public struct ProfilePersistenceMock: ProfilePersistenceProtocol {
     public func removeAllCourseCalendarEvents() {}
     public func getCourseCalendarEvents(for courseId: String) -> [CourseCalendarEvent] { [] }
 }
+#endif
 
 public final class ProfileBundle {
     private init() {}
diff --git a/Profile/Profile/Data/ProfileRepository.swift b/Profile/Profile/Data/ProfileRepository.swift
index 8679aaad4..2bd35cdfe 100644
--- a/Profile/Profile/Data/ProfileRepository.swift
+++ b/Profile/Profile/Data/ProfileRepository.swift
@@ -266,7 +266,7 @@ class ProfileRepositoryMock: ProfileRepositoryProtocol {
             DataLayer.EnrollmentsStatusElement(courseID: "7", courseName: "Course 7", isActive: true),
             DataLayer.EnrollmentsStatusElement(courseID: "8", courseName: "Course 8", isActive: true),
             DataLayer.EnrollmentsStatusElement(courseID: "9", courseName: "Course 9", isActive: true),
-            ]
+        ]
         
         return result.domain
     }
diff --git a/Profile/Profile/Presentation/DatesAndCalendar/CalendarManager.swift b/Profile/Profile/Presentation/DatesAndCalendar/CalendarManager.swift
index da6837b49..157a6aaaf 100644
--- a/Profile/Profile/Presentation/DatesAndCalendar/CalendarManager.swift
+++ b/Profile/Profile/Presentation/DatesAndCalendar/CalendarManager.swift
@@ -62,7 +62,7 @@ public class CalendarManager: CalendarManagerProtocol {
         case ProfileLocalization.Calendar.Dropdown.icloud:
             return iCloud ?? local ?? fallback
         case ProfileLocalization.Calendar.Dropdown.local:
-            return  fallback ?? local
+            return fallback ?? local
         default:
             return iCloud ?? local ?? fallback
         }
@@ -176,7 +176,6 @@ public class CalendarManager: CalendarManagerProtocol {
         let events = generateEvents(for: dateBlocks, courseName: courseName, calendar: calendar)
         var saveSuccessful = true
         events.forEach { event in
-            //            if !alreadyExist(event: event) {
             do {
                 try eventStore.save(event, span: .thisEvent)
                 persistence.saveCourseCalendarEvent(
@@ -245,7 +244,7 @@ public class CalendarManager: CalendarManagerProtocol {
     private func calendarEvent(for block: CourseDateBlock, courseName: String, calendar: EKCalendar) -> EKEvent? {
         guard !block.title.isEmpty else { return nil }
         
-        let title = block.title// + ": " + courseName//calendar.title
+        let title = block.title
         let startDate = block.date.addingTimeInterval(Double(alertOffset) * 3600)
         let secondAlert = startDate.addingTimeInterval(Double(alertOffset) * 86400)
         let endDate = block.date
@@ -269,7 +268,7 @@ public class CalendarManager: CalendarManagerProtocol {
     private func calendarEvent(for blocks: [CourseDateBlock], courseName: String, calendar: EKCalendar) -> EKEvent? {
         guard let block = blocks.first, !block.title.isEmpty else { return nil }
         
-        let title = block.title// + ": " + courseName//calendar.title
+        let title = block.title
         let startDate = block.date.addingTimeInterval(Double(alertOffset) * 3600)
         let secondAlert = startDate.addingTimeInterval(Double(alertOffset) * 86400)
         let endDate = block.date
@@ -336,13 +335,15 @@ public class CalendarManager: CalendarManagerProtocol {
         return shortUrl
     }
 
-    private func generateEvent(title: String,
-                               startDate: Date,
-                               endDate: Date,
-                               secondAlert: Date,
-                               notes: String,
-                               location: String,
-                               calendar: EKCalendar) -> EKEvent {
+    private func generateEvent(
+        title: String,
+        startDate: Date,
+        endDate: Date,
+        secondAlert: Date,
+        notes: String,
+        location: String,
+        calendar: EKCalendar
+    ) -> EKEvent {
         let event = EKEvent(eventStore: eventStore)
         event.title = title
         event.location = location
diff --git a/Profile/Profile/Presentation/DatesAndCalendar/DatesAndCalendarViewModel.swift b/Profile/Profile/Presentation/DatesAndCalendar/DatesAndCalendarViewModel.swift
index 47b2e019f..1f1aae56b 100644
--- a/Profile/Profile/Presentation/DatesAndCalendar/DatesAndCalendarViewModel.swift
+++ b/Profile/Profile/Presentation/DatesAndCalendar/DatesAndCalendarViewModel.swift
@@ -38,10 +38,10 @@ public class DatesAndCalendarViewModel: ObservableObject {
     
     @Published var coursesForSync = [CourseForSync]()
     
-    var coursesForSyncBeforeChanges = [CourseForSync]()
+    private var coursesForSyncBeforeChanges = [CourseForSync]()
     
-    var coursesForDeleting = [CourseForSync]()
-    var coursesForAdding = [CourseForSync]()
+    private var coursesForDeleting = [CourseForSync]()
+    private var coursesForAdding = [CourseForSync]()
     
     @Published var synced: Bool = true
     @Published var hideInactiveCourses: Bool = false
@@ -56,7 +56,7 @@ public class DatesAndCalendarViewModel: ObservableObject {
         }
     }
     
-    let accounts: [DropDownPicker.DownPickerOption] = [
+    private let accounts: [DropDownPicker.DownPickerOption] = [
         .init(title: ProfileLocalization.Calendar.Dropdown.icloud),
         .init(title: ProfileLocalization.Calendar.Dropdown.local)
     ]
@@ -291,7 +291,7 @@ public class DatesAndCalendarViewModel: ObservableObject {
         return syncedCourses
     }
     
-    func deleteOldCalendarIfNeeded() {
+    func deleteOldCalendarIfNeeded() async {
         guard let calSettings = profileStorage.calendarSettings else { return }
         let courseCalendarStates = persistence.getAllCourseStates()
         let courseCountChanges = courseCalendarStates.count != coursesForSync.count
@@ -304,9 +304,7 @@ public class DatesAndCalendarViewModel: ObservableObject {
         calendarManager.removeOldCalendar()
         saveCalendarOptions()
         persistence.removeAllCourseCalendarEvents()
-        Task {
-            await fetchCourses()
-        }
+        await fetchCourses()
     }
     
     private func syncSelectedCourse(
@@ -344,7 +342,6 @@ public class DatesAndCalendarViewModel: ObservableObject {
             await calendarManager.removeOutdatedEvents(courseID: course.courseID)
             persistence.removeCourseState(courseID: course.courseID)
             persistence.removeCourseCalendarEvents(for: course.courseID)
-            // Обновляем статус синхронизации курса
             if let index = self.coursesForSync.firstIndex(where: { $0.courseID == course.courseID }) {
                 self.coursesForSync[index].synced = false
             }
@@ -387,7 +384,6 @@ public class DatesAndCalendarViewModel: ObservableObject {
                 }
             }
         } else {
-            // Убираем из массивов, если состояние курса совпадает с начальным
             if let index = coursesForAdding.firstIndex(where: { $0.courseID == course.courseID }) {
                 coursesForAdding.remove(at: index)
             }
diff --git a/Profile/Profile/Presentation/DatesAndCalendar/Elements/DropDownPicker.swift b/Profile/Profile/Presentation/DatesAndCalendar/Elements/DropDownPicker.swift
index dc3190b04..73fe0a39a 100644
--- a/Profile/Profile/Presentation/DatesAndCalendar/Elements/DropDownPicker.swift
+++ b/Profile/Profile/Presentation/DatesAndCalendar/Elements/DropDownPicker.swift
@@ -67,30 +67,30 @@ public enum DropDownColor: String {
     }
 }
 
-public struct DropDownPicker: View {
+struct DropDownPicker: View {
         
-    public struct DownPickerOption: Hashable {
+    struct DownPickerOption: Hashable {
         let title: String
         let color: Color?
         let colorString: String?
         
-        public init(title: String) {
+        init(title: String) {
             self.title = title
             self.color = nil
             self.colorString = nil
         }
         
-        public init(color: DropDownColor) {
+        init(color: DropDownColor) {
             self.title = color.title
             self.color = color.color
             self.colorString = color.rawValue
         }
         
-        public func hash(into hasher: inout Hasher) {
+        func hash(into hasher: inout Hasher) {
             hasher.combine(title)
         }
         
-        public static func == (lhs: DownPickerOption, rhs: DownPickerOption) -> Bool {
+        static func == (lhs: DownPickerOption, rhs: DownPickerOption) -> Bool {
             lhs.title == rhs.title
         }
     }
@@ -104,13 +104,13 @@ public struct DropDownPicker: View {
     @State private var index = 1000.0
     @State var zindex = 1000.0
     
-    public init(selection: Binding<DownPickerOption?>, state: DropDownPickerState, options: [DownPickerOption]) {
+    init(selection: Binding<DownPickerOption?>, state: DropDownPickerState, options: [DownPickerOption]) {
         self._selection = selection
         self.state = state
         self.options = options
     }
     
-    public var body: some View {
+    var body: some View {
         GeometryReader {
             let size = $0.size
             VStack(spacing: 0) {
diff --git a/Profile/Profile/Presentation/DatesAndCalendar/Models/CalendarSettings.swift b/Profile/Profile/Presentation/DatesAndCalendar/Models/CalendarSettings.swift
index c50843551..7c1970d0c 100644
--- a/Profile/Profile/Presentation/DatesAndCalendar/Models/CalendarSettings.swift
+++ b/Profile/Profile/Presentation/DatesAndCalendar/Models/CalendarSettings.swift
@@ -5,7 +5,7 @@
 //  Created by  Stepanok Ivan on 03.06.2024.
 //
 
-import UIKit
+import Foundation
 
 public struct CalendarSettings: Codable {
     public var colorSelection: String
diff --git a/Profile/Profile/Presentation/DatesAndCalendar/SyncCalendarOptionsView.swift b/Profile/Profile/Presentation/DatesAndCalendar/SyncCalendarOptionsView.swift
index f8ea492de..432303fa6 100644
--- a/Profile/Profile/Presentation/DatesAndCalendar/SyncCalendarOptionsView.swift
+++ b/Profile/Profile/Presentation/DatesAndCalendar/SyncCalendarOptionsView.swift
@@ -140,7 +140,7 @@ public struct SyncCalendarOptionsView: View {
                             }
 
                             Task {
-                                viewModel.deleteOldCalendarIfNeeded()
+                                await viewModel.deleteOldCalendarIfNeeded()
                             }
                         },
                         onCloseTapped: {