diff --git a/Amplify/Categories/DataStore/Model/Temporal/TimeZone+Extension.swift b/Amplify/Categories/DataStore/Model/Temporal/TimeZone+Extension.swift
index 31fee988f7..72a2821739 100644
--- a/Amplify/Categories/DataStore/Model/Temporal/TimeZone+Extension.swift
+++ b/Amplify/Categories/DataStore/Model/Temporal/TimeZone+Extension.swift
@@ -9,12 +9,16 @@
 import Foundation
 
 extension TimeZone {
+    private static let iso8601TimeZoneHHColonMMColonSSRegex = try? NSRegularExpression(pattern: "^[+-]\\d{2}:\\d{2}:\\d{2}$")
     private static let iso8601TimeZoneHHColonMMRegex = try? NSRegularExpression(pattern: "^[+-]\\d{2}:\\d{2}$")
     private static let iso8601TimeZoneHHMMRegex = try? NSRegularExpression(pattern: "^[+-]\\d{2}\\d{2}$")
     private static let iso8601TimeZoneHHRegex = try? NSRegularExpression(pattern: "^[+-]\\d{2}$")
 
+    /// ±hh:mm:ss is not a standard of ISO8601 date format, but it's supported by AWSDateTime.
+    /// https://docs.aws.amazon.com/appsync/latest/devguide/scalars.html 
     private enum ISO8601TimeZonePart {
         case utc
+        case hhmmss(hours: Int, minutes: Int, seconds: Int)
         case hhmm(hours: Int, minutes: Int)
         case hh(hours: Int)
 
@@ -25,6 +29,17 @@ extension TimeZone {
                 } != nil
             }
 
+            // <time>±hh:mm:ss
+            func suffixHHColonMMColonSS() -> String? {
+                if iso8601DateString.count > 9 {
+                    let tz = String(iso8601DateString.dropFirst(iso8601DateString.count - 9))
+                    if hasMatch(regex: TimeZone.iso8601TimeZoneHHColonMMColonSSRegex, str: tz) {
+                        return tz
+                    }
+                }
+                return nil
+            }
+
             // <time>±hh:mm
             func suffixHHColonMM() -> String? {
                 if iso8601DateString.count > 6 {
@@ -86,6 +101,15 @@ extension TimeZone {
                 return
             }
 
+            if let tz = suffixHHColonMMColonSS(),
+               let hours = Int(tz.dropLast(6)),
+               let minutes = Int(tz.dropFirst(4).dropLast(3)),
+               let seconds = Int(tz.dropFirst(7))
+            {
+                self = .hhmmss(hours: hours, minutes: minutes, seconds: seconds)
+                return
+            }
+
             return nil
         }
     }
@@ -101,6 +125,10 @@ extension TimeZone {
         case let .some(.hhmm(hours: hours, minutes: minutes)):
             self.init(secondsFromGMT: hours * 60 * 60 +
                       (hours > 0 ? 1 : -1) * minutes * 60)
+        case let .some(.hhmmss(hours: hours, minutes: minutes, seconds: seconds)):
+            self.init(secondsFromGMT: hours * 60 * 60 +
+                      (hours > 0 ? 1 : -1) * minutes * 60 +
+                      (hours > 0 ? 1 : -1) * seconds)
         case .none:
             return nil
         }
diff --git a/AmplifyTests/CategoryTests/DataStore/TemporalTests.swift b/AmplifyTests/CategoryTests/DataStore/TemporalTests.swift
index 33ce04535e..6047574b19 100644
--- a/AmplifyTests/CategoryTests/DataStore/TemporalTests.swift
+++ b/AmplifyTests/CategoryTests/DataStore/TemporalTests.swift
@@ -53,10 +53,20 @@ class TemporalTests: XCTestCase {
         do {
             let datetime = try Temporal.DateTime(iso8601String: "2023-11-30T11:04:03-08:00")
             XCTAssertEqual(datetime.iso8601String, "2023-11-30T11:04:03.000-08:00")
+            let datetime0 = try Temporal.DateTime(iso8601String: "2023-11-30T11:04:03+08:00")
+            XCTAssertEqual(datetime0.iso8601String, "2023-11-30T11:04:03.000+08:00")
             let datetime1 = try Temporal.DateTime(iso8601String: "2023-11-30T11:04:03.322-0800")
             XCTAssertEqual(datetime1.iso8601String, "2023-11-30T11:04:03.322-08:00")
             let datetime2 = try Temporal.DateTime(iso8601String: "2023-11-30T14:09:27.128-0830")
             XCTAssertEqual(datetime2.iso8601String, "2023-11-30T14:09:27.128-08:30")
+            let datetime3 = try Temporal.DateTime(iso8601String: "2023-11-30T14:09:27.128-0339")
+            XCTAssertEqual(datetime3.iso8601String, "2023-11-30T14:09:27.128-03:39")
+            let datetime4 = try Temporal.DateTime(iso8601String: "2023-11-30T14:09:27.128-0000")
+            XCTAssertEqual(datetime4.iso8601String, "2023-11-30T14:09:27.128Z")
+            let datetime5 = try Temporal.DateTime(iso8601String: "2023-11-30T11:04:03+08:00:21")
+            XCTAssertEqual(datetime5.iso8601String, "2023-11-30T11:03:42.000+08:00")
+            let datetime6 = try Temporal.DateTime(iso8601String: "2023-11-30T11:04:03-08:00:21")
+            XCTAssertEqual(datetime6.iso8601String, "2023-11-30T11:04:24.000-08:00")
             let date = try Temporal.Date(iso8601String: "2023-11-30-08:00")
             XCTAssertEqual(date.iso8601String, "2023-11-30Z")
             let time = try Temporal.Time(iso8601String: "11:00:00.000-08:00")