diff --git a/Projects/App/Sources/Feature/SigninFeature/Sources/SigninView.swift b/Projects/App/Sources/Feature/SigninFeature/Sources/SigninView.swift
index 5f8b836..eda65b4 100644
--- a/Projects/App/Sources/Feature/SigninFeature/Sources/SigninView.swift
+++ b/Projects/App/Sources/Feature/SigninFeature/Sources/SigninView.swift
@@ -101,7 +101,7 @@ struct SigninView: View {
 
                 }
                 .navigationDestination(isPresented: $isActiveSignin) {
-                    SignupView(viewModel: AuthViewModel())
+                    TabBarView()
                 }
                 .padding(.top, 152)
 
diff --git a/Projects/App/Sources/Feature/SignupFeature/Sources/AuthViewModel.swift b/Projects/App/Sources/Feature/SignupFeature/Sources/AuthViewModel.swift
index c13cb96..77d1a07 100644
--- a/Projects/App/Sources/Feature/SignupFeature/Sources/AuthViewModel.swift
+++ b/Projects/App/Sources/Feature/SignupFeature/Sources/AuthViewModel.swift
@@ -93,64 +93,38 @@ public final class AuthViewModel: ObservableObject {
                     case 200:
                         let signInResponse = try result.map(SigninResponse.self)
 
-                        // 만료 시간을 현재로부터의 시간 대신 `Date(timeIntervalSince1970:)`으로 변환
-                        if let accessTokenExpiresIn = Double(signInResponse.accessTokenExpiresIn),
-                           let refreshTokenExpiresIn = Double(signInResponse.refreshTokenExpiresIn) {
+                        let dateFormatter = DateFormatter()
+                        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
+                        dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
 
-                            let accessTokenExpirationDate = Date(timeIntervalSince1970: accessTokenExpiresIn)
-                            let refreshTokenExpirationDate = Date(timeIntervalSince1970: refreshTokenExpiresIn)
+                        if let accessTokenExpirationDate = dateFormatter.date(from: signInResponse.accessTokenExpiresIn),
+                           let refreshTokenExpirationDate = dateFormatter.date(from: signInResponse.refreshTokenExpiresIn) {
+
+                            let accessTokenExpirationInterval = accessTokenExpirationDate.timeIntervalSinceNow
+                            let refreshTokenExpirationInterval = refreshTokenExpirationDate.timeIntervalSinceNow
 
                             KeyChain.shared.saveTokenWithExpiration(
                                 key: Const.KeyChainKey.accessToken,
                                 token: signInResponse.accessToken,
-                                expiresIn: accessTokenExpirationDate.timeIntervalSinceNow
+                                expiresIn: accessTokenExpirationInterval
                             )
 
                             KeyChain.shared.saveTokenWithExpiration(
                                 key: Const.KeyChainKey.refreshToken,
                                 token: signInResponse.refreshToken,
-                                expiresIn: refreshTokenExpirationDate.timeIntervalSinceNow
+                                expiresIn: refreshTokenExpirationInterval
                             )
 
-                            // 만료 시간 확인을 위한 출력
-                            let dateFormatter = DateFormatter()
-                            dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
-                            dateFormatter.timeZone = TimeZone.current
-
-                            print("Access Token 만료 날짜: \(dateFormatter.string(from: accessTokenExpirationDate))")
-                            print("Refresh Token 만료 날짜: \(dateFormatter.string(from: refreshTokenExpirationDate))")
+                            print("Access Token 만료 날짜: \(accessTokenExpirationDate)")
+                            print("Refresh Token 만료 날짜: \(refreshTokenExpirationDate)")
                         } else {
-                            print("만료 시간 변환 오류: accessTokenExpiresIn 또는 refreshTokenExpiresIn이 Double로 변환되지 않음.")
+                            print("만료 시간 변환 오류: 유효한 날짜 형식이 아님.")
                         }
 
                         DispatchQueue.main.async {
                             completion(statusCode, signInResponse.accessToken, signInResponse.refreshToken)
                         }
 
-                    case 400:
-                        print("400ㅣ비밀번호가 일치하지 않습니다.")
-                        DispatchQueue.main.async {
-                            completion(statusCode, nil, nil)
-                        }
-
-                    case 403:
-                        print("403ㅣ아직 보류중입니다.")
-                        DispatchQueue.main.async {
-                            completion(statusCode, nil, nil)
-                        }
-
-                    case 404:
-                        print("404ㅣ계정을 찾지 못했습니다.")
-                        DispatchQueue.main.async {
-                            completion(statusCode, nil, nil)
-                        }
-
-                    case 500..<600:
-                        print("\(statusCode)ㅣ서버오류입니다.")
-                        DispatchQueue.main.async {
-                            completion(statusCode, nil, nil)
-                        }
-
                     default:
                         print("Unhandled status code: \(statusCode)")
                         DispatchQueue.main.async {
@@ -173,8 +147,6 @@ public final class AuthViewModel: ObservableObject {
         }
     }
 
-
-
     // MARK: - Sign Up
     func signUp(completion: @escaping (Bool) -> Void) {
             let params = SignupRequest(name: name, nickname: nickname, email: email, password: password, phoneNumber: phoneNumber)