MOBILE-182: Pin DateFormatter locale to fix dateTimeUtc on InAppShowFailure

Mindbox.xcodeproj/project.pbxproj

@@ -367,6 +367,7 @@
 		A153E04129BB0A8B003C34D4 /* InAppConfigurationWithOperations.json in Resources */ = {isa = PBXBuildFile; fileRef = A153E04029BB0A8B003C34D4 /* InAppConfigurationWithOperations.json */; };
 		A154E304299C189300F8F074 /* MBLoggerCoreDataManagerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = A154E303299C189300F8F074 /* MBLoggerCoreDataManagerTests.swift */; };
 		A154E32E299E0D8900F8F074 /* SDKLogManagerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = A154E32D299E0D8900F8F074 /* SDKLogManagerTests.swift */; };
+		974C7734AF47A6A1E1137E0E /* DateFormatTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1EC463C4B1A88855D9A47FAF /* DateFormatTests.swift */; };
 		A154E330299E0F1600F8F074 /* InAppGeoResponse.swift in Sources */ = {isa = PBXBuildFile; fileRef = A154E32F299E0F1600F8F074 /* InAppGeoResponse.swift */; };
 		A154E334299E110E00F8F074 /* EventRepositoryMock.swift in Sources */ = {isa = PBXBuildFile; fileRef = A154E333299E110E00F8F074 /* EventRepositoryMock.swift */; };
 		A15D701629AF810E007131E7 /* SDKLogsRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = A154E381299E5B7500F8F074 /* SDKLogsRequest.swift */; };
@@ -463,7 +464,6 @@
 		D2F7E24C2BADC4CA00B24BB8 /* MockSessionManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = D2F7E24B2BADC4CA00B24BB8 /* MockSessionManager.swift */; };
 		DEC482157E5249DBBFAEFC9A /* FeatureTogglesModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9778038796A8426ABDED1E97 /* FeatureTogglesModel.swift */; };
 		EA395B77BB16CEFE6DC91D1D /* TransparentViewSyncOperationResponseTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4B7DAFAB687945FA908DB1AC /* TransparentViewSyncOperationResponseTests.swift */; };
-		F26DFF81C3FF57C3DE68DEDC /* Date+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 326423031CA9C6BF0E62BEFD /* Date+Extensions.swift */; };
 		F30005442CFF3F7D004BE915 /* ABTestStubs.swift in Sources */ = {isa = PBXBuildFile; fileRef = F30005432CFF3F7D004BE915 /* ABTestStubs.swift */; };
 		F306291A2BD27D7500EF6609 /* InappFrequencyTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = F30629192BD27D7500EF6609 /* InappFrequencyTests.swift */; };
 		F30654BB2F1A83520058808C /* MindboxWebViewFacade.swift in Sources */ = {isa = PBXBuildFile; fileRef = F30654BA2F1A83520058808C /* MindboxWebViewFacade.swift */; };
@@ -765,7 +765,6 @@
 		31ED2DF025C4456600301FAD /* TestConfig_Invalid_1.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = TestConfig_Invalid_1.plist; sourceTree = "<group>"; };
 		31ED2DF125C4456600301FAD /* TestConfig_Invalid_3.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = TestConfig_Invalid_3.plist; sourceTree = "<group>"; };
 		31ED2DF925C4459400301FAD /* TestConfig_Invalid_4.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; path = TestConfig_Invalid_4.plist; sourceTree = "<group>"; };
-		326423031CA9C6BF0E62BEFD /* Date+Extensions.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = "Date+Extensions.swift"; sourceTree = "<group>"; };
 		33072F2D2664C24F001F1AB2 /* AreaResponse.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AreaResponse.swift; sourceTree = "<group>"; };
 		33072F2F2664C2E4001F1AB2 /* SubscriptionResponse.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SubscriptionResponse.swift; sourceTree = "<group>"; };
 		33072F312664C357001F1AB2 /* ProductListResponse.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProductListResponse.swift; sourceTree = "<group>"; };
@@ -1098,6 +1097,7 @@
 		A153E04029BB0A8B003C34D4 /* InAppConfigurationWithOperations.json */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.json; path = InAppConfigurationWithOperations.json; sourceTree = "<group>"; };
 		A154E303299C189300F8F074 /* MBLoggerCoreDataManagerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MBLoggerCoreDataManagerTests.swift; sourceTree = "<group>"; };
 		A154E32D299E0D8900F8F074 /* SDKLogManagerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SDKLogManagerTests.swift; sourceTree = "<group>"; };
+		1EC463C4B1A88855D9A47FAF /* DateFormatTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DateFormatTests.swift; sourceTree = "<group>"; };
 		A154E32F299E0F1600F8F074 /* InAppGeoResponse.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = InAppGeoResponse.swift; sourceTree = "<group>"; };
 		A154E333299E110E00F8F074 /* EventRepositoryMock.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EventRepositoryMock.swift; sourceTree = "<group>"; };
 		A154E33A299E5B6D00F8F074 /* LogLevel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LogLevel.swift; sourceTree = "<group>"; };
@@ -2811,6 +2811,7 @@
 				A154E32D299E0D8900F8F074 /* SDKLogManagerTests.swift */,
 				47A4FA772E73741700569870 /* LoggerDatabaseLoaderTests.swift */,
 				47A4FA752E735C5200569870 /* LogStoreTrimmerTests.swift */,
+				1EC463C4B1A88855D9A47FAF /* DateFormatTests.swift */,
 			);
 			path = MindboxLogger;
 			sourceTree = "<group>";
@@ -3573,7 +3574,6 @@
 				BB4D7CC62BDEC51D008E3AB8 /* Notification+Extensions.swift */,
 				BB65630F2BE3BA430090C473 /* UIApplication+Extensions.swift */,
 				F31DB4072F56A50E00DCEB85 /* NSError+Extensions.swift */,
-				326423031CA9C6BF0E62BEFD /* Date+Extensions.swift */,
 				F3482F292A65DCFC002A41EC /* String+Extensions.swift */,
 			);
 			path = Extensions;
@@ -4657,7 +4657,6 @@
 				B3A625502689F8B600B6A3B7 /* BenefitResponse.swift in Sources */,
 				84C65E6425D4FBBB008996FA /* MobileApplicationInfoUpdated.swift in Sources */,
 				84DEE8AD25CC036A00C98CC7 /* MBDatabaseRepository.swift in Sources */,
-				F26DFF81C3FF57C3DE68DEDC /* Date+Extensions.swift in Sources */,
 				6182078DDFC681D168546DAD /* HapticService.swift in Sources */,
 				A1B2C3D4E5F6A7B8C9D0E1F2 /* MotionService.swift in Sources */,
 				6182078DDFC681D168546DAE /* HapticRequest.swift in Sources */,
@@ -4698,6 +4697,7 @@
 				F367301D2B7B8B6A00DD0039 /* NotificationFormatTests.swift in Sources */,
 				F35E0C4F2DF0535E00E8A768 /* InAppTrackingServiceTests.swift in Sources */,
 				A154E32E299E0D8900F8F074 /* SDKLogManagerTests.swift in Sources */,
+				974C7734AF47A6A1E1137E0E /* DateFormatTests.swift in Sources */,
 				9B52570728D1AF880029B1BC /* InAppPresentationManagerMock.swift in Sources */,
 				D2F7E2482BADB9EF00B24BB8 /* UserVisitManagerTests.swift in Sources */,
 				BBAAC17C2BB2FC9100E1E25E /* MockEvent.swift in Sources */,

Mindbox/InAppMessages/Presentation/Views/WebView/Debug/MindboxWebViewFacade.swift

@@ -8,6 +8,7 @@
 
 import UIKit
 import WebKit
+import MindboxLogger
 
 private enum PayloadKey {
     static let sdkVersion = "sdkVersion"
@@ -238,7 +239,7 @@ extension MindboxWebViewFacade {
         ]
 
         if let firstInitDate = persistenceStorage.firstInitializationDateTime {
-            params[PayloadKey.firstInitializationDateTime] = firstInitDate.iso8601
+            params[PayloadKey.firstInitializationDateTime] = firstInitDate.toString(withFormat: .utc)
         }
 
         return params

Mindbox/Model/Common/MBDate.swift

@@ -28,7 +28,8 @@ public final class DateTime: MBDate {
     }
 
     override func decodeWithFormat(_ rawString: String) -> Date? {
-        return Date.fromISO8601(rawString)
+        return rawString.toDate(withFormat: .utc)
+            ?? rawString.toDate(withFormat: .utcWithMillis)
     }
 }
 

MindboxLogger/Shared/Extensions/Date+Extension.swift

@@ -15,18 +15,21 @@ public extension Date {
 
     func toFullString() -> String {
         let dateFormatter = DateFormatter()
+        dateFormatter.locale = Locale(identifier: "en_US_POSIX")
         dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
         return dateFormatter.string(from: self as Date)
     }
 
     static var dateFormatter: DateFormatter {
         let formatter = DateFormatter()
-        formatter.dateFormat = "hh:mm:ss.SSSS"
+        formatter.locale = Locale(identifier: "en_US_POSIX")
+        formatter.dateFormat = "HH:mm:ss.SSSS"
         return formatter
     }
 
     func toString(withFormat format: DateFormat) -> String {
         let dateFormatter = DateFormatter()
+        dateFormatter.locale = Locale(identifier: "en_US_POSIX")
         dateFormatter.dateFormat = format.value
         dateFormatter.timeZone = TimeZone(identifier: "UTC")
         return dateFormatter.string(from: self)
@@ -36,6 +39,7 @@ public extension Date {
 public extension TimeInterval {
     private static let readableDateTimeFormatter: DateFormatter = {
         let formatter = DateFormatter()
+        formatter.locale = Locale(identifier: "en_US_POSIX")
         formatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
         return formatter
     }()

MindboxLogger/Shared/Extensions/String+Extensions.swift

@@ -10,6 +10,7 @@ import Foundation
 public enum DateFormat: String {
     case api = "yyyy-MM-dd'T'HH:mm:ss"
     case utc = "yyyy-MM-dd'T'HH:mm:ss'Z'"
+    case utcWithMillis = "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX"
 
     var value: String {
         return self.rawValue
@@ -19,6 +20,7 @@ public enum DateFormat: String {
 public extension String {
     func toDate(withFormat format: DateFormat) -> Date? {
         let dateFormatterGet = DateFormatter()
+        dateFormatterGet.locale = Locale(identifier: "en_US_POSIX")
         dateFormatterGet.dateFormat = format.value
         dateFormatterGet.timeZone = TimeZone(identifier: "UTC")
 

MindboxTests/Extensions/Tag+Extensions.swift

@@ -27,4 +27,6 @@ extension Tag {
     @Tag static var trackVisit: Self
     @Tag static var operationsRouting: Self
     @Tag static var mbConfiguration: Self
+
+    @Tag static var dateFormatting: Self
 }

MindboxTests/InApp/Tests/InappShowFailureManagerTests.swift

@@ -9,6 +9,7 @@
 import XCTest
 import UIKit
 @testable import Mindbox
+@testable import MindboxLogger
 
 final class InappShowFailureManagerTests: XCTestCase {
     private var databaseRepository: InappShowFailureDatabaseRepositoryMock!
@@ -65,7 +66,16 @@ final class InappShowFailureManagerTests: XCTestCase {
         let event = try XCTUnwrap(databaseRepository.createdEvents.first)
         let failure = try XCTUnwrap(decodeFailures(from: event)?.first)
         XCTAssertFalse(failure.dateTimeUtc.isEmpty)
-        XCTAssertNotNil(makeUTCFormatter().date(from: failure.dateTimeUtc))
+        XCTAssertNotNil(failure.dateTimeUtc.toDate(withFormat: .utc))
+
+        let dateTimeUtc = failure.dateTimeUtc
+        XCTAssertEqual(dateTimeUtc.count, 20)
+        XCTAssertTrue(dateTimeUtc.hasSuffix("Z"))
+        XCTAssertFalse(dateTimeUtc.contains("AM"))
+        XCTAssertFalse(dateTimeUtc.contains("PM"))
+        XCTAssertFalse(dateTimeUtc.contains(" "))
+        let pattern = #"^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z$"#
+        XCTAssertNotNil(dateTimeUtc.range(of: pattern, options: .regularExpression))
     }
 
     func testAddFailure_duplicateInappId_isIgnored() throws {
@@ -359,14 +369,6 @@ private extension InappShowFailureManagerTests {
         BodyDecoder<InAppShowFailuresBody>(decodable: event.body)?.body.failures
     }
 
-    func makeUTCFormatter() -> DateFormatter {
-        let formatter = DateFormatter()
-        formatter.locale = Locale(identifier: "en_US_POSIX")
-        formatter.timeZone = TimeZone(secondsFromGMT: 0)
-        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss'Z'"
-        return formatter
-    }
-
     func applyFeatureToggle(shouldSendInAppShowError: Bool) {
         let settingsJSON = """
         {

MindboxTests/MindboxLogger/DateFormatTests.swift

@@ -0,0 +1,64 @@
+//
+//  DateFormatTests.swift
+//  MindboxTests
+//
+//  Copyright © 2026 Mindbox. All rights reserved.
+//
+
+import Foundation
+import Testing
+@testable import MindboxLogger
+
+@Suite("DateFormat ISO-8601 primitive", .tags(.dateFormatting))
+struct DateFormatTests {
+
+    private let fixedDate = Date(timeIntervalSince1970: 1_747_017_155) // 2025-05-12T02:32:35Z
+
+    @Test("Date.toString(withFormat: .utc) produces literal yyyy-MM-dd'T'HH:mm:ss'Z'")
+    func utcFormatLiteral() {
+        #expect(fixedDate.toString(withFormat: .utc) == "2025-05-12T02:32:35Z")
+    }
+
+    @Test("Date.toString(withFormat: .api) produces literal yyyy-MM-dd'T'HH:mm:ss")
+    func apiFormatLiteral() {
+        #expect(fixedDate.toString(withFormat: .api) == "2025-05-12T02:32:35")
+    }
+
+    @Test("String.toDate(withFormat: .utc) parses canonical UTC literal")
+    func utcParseRoundTrip() {
+        let parsed = "2025-05-12T02:32:35Z".toDate(withFormat: .utc)
+        #expect(parsed == fixedDate)
+    }
+
+    @Test("String.toDate(withFormat: .utcWithMillis) parses millisecond-precision payloads")
+    func millisParse() {
+        let parsed = "2025-05-12T02:32:35.123Z".toDate(withFormat: .utcWithMillis)
+        #expect(parsed != nil)
+        let expected = Date(timeIntervalSince1970: 1_747_017_155.123)
+        if let parsed {
+            #expect(abs(parsed.timeIntervalSince(expected)) < 0.001)
+        }
+    }
+
+    @Test("Formatter does not silently switch to 12h pattern under 12-hour preference")
+    func twelveHourPreferenceDoesNotLeakIntoOutput() {
+        // QA1480: when the user's region preference is 12h, DateFormatter rewrites
+        // HH:mm:ss into h:mm:ss a unless locale is en_US_POSIX. We assert the
+        // literal still matches the contract — no AM/PM, no whitespace, leading zero.
+        let serialized = fixedDate.toString(withFormat: .utc)
+        #expect(!serialized.contains("AM"))
+        #expect(!serialized.contains("PM"))
+        #expect(!serialized.contains(" "))
+        #expect(serialized.hasSuffix("Z"))
+        #expect(serialized.count == 20)
+    }
+
+    @Test("UTC and millis round-trip via DateTime decoder fallback")
+    func roundTripFallbackChain() {
+        let withMillis = "2025-05-12T02:32:35.000Z"
+        let plain = "2025-05-12T02:32:35Z"
+        #expect(plain.toDate(withFormat: .utc) != nil)
+        #expect(withMillis.toDate(withFormat: .utc) == nil)
+        #expect(withMillis.toDate(withFormat: .utcWithMillis) != nil)
+    }
+}