diff --git a/EppLib.UnitTests/LocalTest.cs b/EppLib.UnitTests/LocalTest.cs
index be05c14..2ffefdf 100644
--- a/EppLib.UnitTests/LocalTest.cs
+++ b/EppLib.UnitTests/LocalTest.cs
@@ -17,13 +17,13 @@ public class LocalTest
 
         public TestContext TestContext { get; set; }
 
-        [TestInitialize]
-        public void TestSetup()
-        {
-            var testName = TestContext.TestName;
-            var method = new StackFrame().GetMethod().DeclaringType.GetMethod(testName);
-            var attributes = method.GetCustomAttributes(typeof(DeploymentItemAttribute), false);
-            DeploymentUtility.CopyDeploymentItems(attributes);
+        [TestInitialize]
+        public void TestSetup()
+        {
+            var testName = TestContext.TestName;
+            var method = new StackFrame().GetMethod().DeclaringType.GetMethod(testName);
+            var attributes = method.GetCustomAttributes(typeof(DeploymentItemAttribute), false);
+            DeploymentUtility.CopyDeploymentItems(attributes);
         }
 
         public LocalTest()
@@ -1072,6 +1072,21 @@ public void TestDomainRenewCommand1()
             Assert.AreEqual(expected, command.ToXml().InnerXml);
         }
 
+        /// <summary>
+        /// Domain renew command given a full UTC date-time, as returned in exDate. The date must not shift with the local timezone.
+        /// </summary>
+        [TestMethod]
+        [TestCategory("LocalCommand")]
+        [DeploymentItem("TestData/DomainRenewCommand1.xml")]
+        public void TestDomainRenewCommandWithUtcDateTime()
+        {
+            string expected = File.ReadAllText("DomainRenewCommand1.xml");
+
+            var command = new DomainRenew("example.com", "2000-04-03T22:00:00.0Z", new DomainPeriod(5, "y"));
+            command.TransactionId = "ABC-12345";
+            Assert.AreEqual(expected, command.ToXml().InnerXml);
+        }
+
         /// <summary>
         /// Domain renew response, example RFC5731
         /// </summary>
@@ -1080,7 +1095,12 @@ public void TestDomainRenewCommand1()
         [DeploymentItem("TestData/DomainRenewResponse1.xml")]
         public void TestDomainRenewResponse1()
         {
-            Assert.Inconclusive("Not implemented");
+            var response = new DomainRenewResponse(File.ReadAllBytes("DomainRenewResponse1.xml"));
+
+            Assert.AreEqual("1000", response.Code);
+            Assert.IsNotNull(response.ExDate);
+            Assert.AreEqual(new DateTime(2005, 4, 3, 22, 0, 0, DateTimeKind.Utc), response.ExDate.Value);
+            Assert.AreEqual(DateTimeKind.Utc, response.ExDate.Value.Kind);
         }
 
         #endregion
diff --git a/EppLib.UnitTests/NominetExtensionLocalTest.cs b/EppLib.UnitTests/NominetExtensionLocalTest.cs
index 986f1de..b5be7dc 100644
--- a/EppLib.UnitTests/NominetExtensionLocalTest.cs
+++ b/EppLib.UnitTests/NominetExtensionLocalTest.cs
@@ -65,9 +65,11 @@ public void TestNominetContactInfoResponse1()
             Assert.AreEqual("invalid", response.DataQuality.Status);
             Assert.AreEqual("Incorrect Address", response.DataQuality.Reason);
             Assert.IsTrue(response.DataQuality.DateCommenced.HasValue);
-            Assert.AreEqual(new DateTime(2015,5,7,13,20,4).ToString(), response.DataQuality.DateCommenced.Value.ToString());
+            Assert.AreEqual(new DateTime(2015, 5, 7, 13, 20, 4, DateTimeKind.Utc), response.DataQuality.DateCommenced.Value);
+            Assert.AreEqual(DateTimeKind.Utc, response.DataQuality.DateCommenced.Value.Kind);
             Assert.IsTrue(response.DataQuality.DateToSuspend.HasValue);
-            Assert.AreEqual(new DateTime(2015, 6, 6, 13, 20, 4).ToString(), response.DataQuality.DateToSuspend.Value.ToString());
+            Assert.AreEqual(new DateTime(2015, 6, 6, 13, 20, 4, DateTimeKind.Utc), response.DataQuality.DateToSuspend.Value);
+            Assert.AreEqual(DateTimeKind.Utc, response.DataQuality.DateToSuspend.Value.Kind);
             Assert.IsTrue(response.DataQuality.LockApplied.HasValue);
             Assert.IsTrue(response.DataQuality.LockApplied.Value);
             Assert.IsNotNull(response.DataQuality.DomainList);
@@ -314,7 +316,8 @@ public void TestAbuseNotification()
             Assert.AreEqual("www.youve.been.phished.co.uk", notification.HostName);
             Assert.AreEqual("http://www.youve.been.phished.co.uk/give/us/your/money.htm", notification.Url);
             Assert.IsNotNull(notification.Date);
-            Assert.AreEqual(new DateTime(2011, 3, 1, 11, 44, 1), notification.Date.Value);
+            Assert.AreEqual(new DateTime(2011, 3, 1, 11, 44, 1, DateTimeKind.Utc), notification.Date.Value);
+            Assert.AreEqual(DateTimeKind.Utc, notification.Date.Value.Kind);
             Assert.AreEqual("213.135.134.24", notification.Ip);
             Assert.AreEqual("ns0.crooked.dealings.net", notification.Nameserver);
             Assert.AreEqual("hostmaster@crooked.dealings.net", notification.DnsAdmin);
@@ -350,7 +353,8 @@ public void TestDomainsSuspendedNotification()
 
             Assert.AreEqual("Data Quality", notification.SuspendedReason);
             Assert.IsNotNull(notification.CancelDate);
-            Assert.AreEqual(new DateTime(2009, 12, 12, 0, 0, 13, DateTimeKind.Utc), notification.CancelDate.Value.ToUniversalTime());
+            Assert.AreEqual(new DateTime(2009, 12, 12, 0, 0, 13, DateTimeKind.Utc), notification.CancelDate.Value);
+            Assert.AreEqual(DateTimeKind.Utc, notification.CancelDate.Value.Kind);
             Assert.IsNotNull(notification.SuspendedDomains);
             Assert.AreEqual(2, notification.SuspendedDomains.Count);
             Assert.AreEqual("epp-example1.co.uk", notification.SuspendedDomains.First());
diff --git a/EppLib/Entities/Domain/DomainRenew.cs b/EppLib/Entities/Domain/DomainRenew.cs
index 57e544e..a2ca87e 100755
--- a/EppLib/Entities/Domain/DomainRenew.cs
+++ b/EppLib/Entities/Domain/DomainRenew.cs
@@ -35,7 +35,7 @@ protected override XmlElement BuildCommandElement(XmlDocument doc, XmlElement co
             var domainRenew = BuildCommandElement(doc, "renew", commandRootElement);
 
             AddXmlElement(doc, domainRenew, "domain:name", DomainName, namespaceUri);
-            AddXmlElement(doc, domainRenew, "domain:curExpDate", DateTime.Parse(CurrentExpirationDate, CultureInfo.InvariantCulture).ToString("yyyy-MM-dd", CultureInfo.InvariantCulture), namespaceUri);
+            AddXmlElement(doc, domainRenew, "domain:curExpDate", EppDateTime.Parse(CurrentExpirationDate).ToString("yyyy-MM-dd", CultureInfo.InvariantCulture), namespaceUri);
 
             if (m_period != null)
             {
diff --git a/EppLib/Entities/Domain/DomainRenewResponse.cs b/EppLib/Entities/Domain/DomainRenewResponse.cs
index 09f0331..32b9852 100755
--- a/EppLib/Entities/Domain/DomainRenewResponse.cs
+++ b/EppLib/Entities/Domain/DomainRenewResponse.cs
@@ -41,7 +41,7 @@ protected override void ProcessDataNode(XmlDocument doc, XmlNamespaceManager nam
                 if (exDateNode != null)
                 {
                     DateTime exDate;
-                    if (DateTime.TryParse(exDateNode.InnerText, out exDate))
+                    if (EppDateTime.TryParse(exDateNode.InnerText, out exDate))
                     {
                         this._exDate = exDate;
                     }
diff --git a/EppLib/EppDateTime.cs b/EppLib/EppDateTime.cs
new file mode 100644
index 0000000..0bdc8c9
--- /dev/null
+++ b/EppLib/EppDateTime.cs
@@ -0,0 +1,38 @@
+// Copyright 2012 Code Maker Inc. (http://codemaker.net)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+using System;
+using System.Globalization;
+
+namespace EppLib
+{
+    /// <summary>
+    /// Parses EPP date-time values. RFC 5730-5733 require every date-time to be UTC, so values
+    /// are returned as UTC (DateTimeKind.Utc). Values with an offset are converted to UTC, and
+    /// values without a zone designator, which some registries send, are taken to be UTC.
+    /// </summary>
+    internal static class EppDateTime
+    {
+        private const DateTimeStyles Styles = DateTimeStyles.AssumeUniversal | DateTimeStyles.AdjustToUniversal;
+
+        public static bool TryParse(string value, out DateTime result)
+        {
+            return DateTime.TryParse(value, CultureInfo.InvariantCulture, Styles, out result);
+        }
+
+        public static DateTime Parse(string value)
+        {
+            return DateTime.Parse(value, CultureInfo.InvariantCulture, Styles);
+        }
+    }
+}
diff --git a/EppLib/EppLib.csproj b/EppLib/EppLib.csproj
index e4f40cb..186de71 100644
--- a/EppLib/EppLib.csproj
+++ b/EppLib/EppLib.csproj
@@ -4,7 +4,7 @@
     <TargetFrameworks>netstandard2.0;net10.0</TargetFrameworks>
     <AssemblyName>EppLib</AssemblyName>
     <PackageId>EppLib</PackageId>
-    <Version>1.5.0</Version>
+    <Version>1.6.0</Version>
     <Authors>Code Maker Inc. and Contributors</Authors>
     <Description>EppLib.NET provides a library that makes easy for registrars to interact with registries implementing the Extensible Provisioning Protocol (EPP). Includes extensions for CIRA (.CA), Nominet (.UK), IIS (.SE), Verisign Namestore, LaunchPhase and SecDNS.</Description>
     <PackageTags>epp;registrar;registry;domain;rfc5730</PackageTags>
@@ -13,7 +13,7 @@
     <RepositoryUrl>https://github.com/CodeMakerInc/EppLib.NET.git</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <PackageReadmeFile>README.md</PackageReadmeFile>
-    <PackageReleaseNotes>Breaking: TcpTransport now validates the registry's server certificate (trusted chain and matching host name) instead of accepting any certificate. For test environments with self-signed certificates, set TcpTransport.ServerCertificateValidationCallback.</PackageReleaseNotes>
+    <PackageReleaseNotes>Breaking: parsed EPP dates (DomainRenewResponse.ExDate and the Nominet dates) are now returned in UTC (DateTimeKind.Utc) as RFC 5730-5733 require, instead of being converted to the machine's local time. Values without a zone designator are taken as UTC. Fixes DomainRenew sending the wrong curExpDate east of UTC when given a full date-time, and a culture-dependent Smallregistry birthDate.</PackageReleaseNotes>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
@@ -179,6 +179,7 @@
     <Compile Include="Extensions\Smallregistry\ContactCreate\SmallregistryContactPMCreateExtension.cs" />
     <Compile Include="Extensions\Smallregistry\ContactCreate\SmallregistryContactPPCreateExtension.cs" />
     <Compile Include="Extensions\Smallregistry\SmallregistryExtensionBase.cs" />
+    <Compile Include="EppDateTime.cs" />
     <Compile Include="ITransport.cs" />
     <Compile Include="Service.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/EppLib/Extensions/Nominet/ContactInfo/NominetContactInfoResponse.cs b/EppLib/Extensions/Nominet/ContactInfo/NominetContactInfoResponse.cs
index b85752a..b175a48 100644
--- a/EppLib/Extensions/Nominet/ContactInfo/NominetContactInfoResponse.cs
+++ b/EppLib/Extensions/Nominet/ContactInfo/NominetContactInfoResponse.cs
@@ -94,7 +94,7 @@ protected override void ProcessExtensionNode(XmlDocument doc, XmlNamespaceManage
                 if (dateCommenced != null)
                 {
                     DateTime date;
-                    if (DateTime.TryParse(dateCommenced.InnerText, out date))
+                    if (EppDateTime.TryParse(dateCommenced.InnerText, out date))
                     {
                         _nomDataQuality.DateCommenced = date;
                     }
@@ -103,7 +103,7 @@ protected override void ProcessExtensionNode(XmlDocument doc, XmlNamespaceManage
                 if (dateToSuspend != null)
                 {
                     DateTime date;
-                    if (DateTime.TryParse(dateToSuspend.InnerText, out date))
+                    if (EppDateTime.TryParse(dateToSuspend.InnerText, out date))
                     {
                         _nomDataQuality.DateToSuspend = date;
                     }
diff --git a/EppLib/Extensions/Nominet/Notifications/AbuseNotification.cs b/EppLib/Extensions/Nominet/Notifications/AbuseNotification.cs
index 71c115d..da3a378 100644
--- a/EppLib/Extensions/Nominet/Notifications/AbuseNotification.cs
+++ b/EppLib/Extensions/Nominet/Notifications/AbuseNotification.cs
@@ -57,7 +57,7 @@ protected override void ProcessDataNode(XmlDocument doc, XmlNamespaceManager nam
                 if (dateNode != null)
                 {
                     DateTime parsedDate;
-                    if (DateTime.TryParse(dateNode.InnerText, out parsedDate))
+                    if (EppDateTime.TryParse(dateNode.InnerText, out parsedDate))
                     {
                         Date = parsedDate;
                     }
diff --git a/EppLib/Extensions/Nominet/Notifications/DomainsSuspendedNotification.cs b/EppLib/Extensions/Nominet/Notifications/DomainsSuspendedNotification.cs
index 1b04779..f425109 100644
--- a/EppLib/Extensions/Nominet/Notifications/DomainsSuspendedNotification.cs
+++ b/EppLib/Extensions/Nominet/Notifications/DomainsSuspendedNotification.cs
@@ -32,7 +32,7 @@ protected override void ProcessDataNode(XmlDocument doc, XmlNamespaceManager nam
                 if (cancelDateNode != null)
                 {
                     DateTime parsedDate;
-                    if (DateTime.TryParse(cancelDateNode.InnerText, out parsedDate))
+                    if (EppDateTime.TryParse(cancelDateNode.InnerText, out parsedDate))
                     {
                         CancelDate = parsedDate;
                     }
diff --git a/EppLib/Extensions/Smallregistry/ContactCreate/SmallregistryContactPPCreateExtension.cs b/EppLib/Extensions/Smallregistry/ContactCreate/SmallregistryContactPPCreateExtension.cs
index 990090e..1a225a6 100644
--- a/EppLib/Extensions/Smallregistry/ContactCreate/SmallregistryContactPPCreateExtension.cs
+++ b/EppLib/Extensions/Smallregistry/ContactCreate/SmallregistryContactPPCreateExtension.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using System.Xml;
 
 namespace EppLib.Extensions.Smallregistry
@@ -19,7 +20,7 @@ public override XmlNode ToXml(XmlDocument doc)
 
             if (BirthDate != null)
             {
-                AddXmlElement(doc, person, "birthDate", BirthDate.ToString("yyyy-MM-dd"));
+                AddXmlElement(doc, person, "birthDate", BirthDate.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
             }
 
             if (BirthPlace != null)