diff --git a/src/Umbraco.Core/Configuration/ClientDependencyConfiguration.cs b/src/Umbraco.Core/Configuration/ClientDependencyConfiguration.cs
index 62cd1ab59c..3a08361bd6 100644
--- a/src/Umbraco.Core/Configuration/ClientDependencyConfiguration.cs
+++ b/src/Umbraco.Core/Configuration/ClientDependencyConfiguration.cs
@@ -1,10 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
 using System.Web;
 using System.Xml.Linq;
 using ClientDependency.Core.CompositeFiles.Providers;
 using ClientDependency.Core.Config;
+using Semver;
 using Umbraco.Core.IO;
 using Umbraco.Core.Logging;
 
@@ -25,6 +29,79 @@ namespace Umbraco.Core.Configuration
             _fileName = IOHelper.MapPath(string.Format("{0}/ClientDependency.config", SystemDirectories.Config));
         }
 
+        /// <summary>
+        /// Changes the version number in ClientDependency.config to a hashed value for the version and the DateTime.Now
+        /// </summary>
+        /// <returns>Boolean to indicate succesful update of the ClientDependency.config file</returns>
+        /// <seealso cref="UpdateVersionNumber(SemVersion, DateTime, string)" />
+        [Obsolete("Use the overload specifying the date and dateFormat")]
+        public bool UpdateVersionNumber()
+        {
+            return UpdateVersionNumber(UmbracoVersion.GetSemanticVersion(), DateTime.UtcNow, "yyyyMMdd");
+        }
+
+        /// <summary>
+        /// Changes the version number in ClientDependency.config to a hashed value for the version and the DateTime.Day
+        /// </summary>
+        /// <param name="version">The <see cref="SemVersion">version</see> of Umbraco we're upgrading to</param>
+        /// <param name="date">A <see cref="DateTime">date</see> value to use in the hash to prevent this method from updating the version on each startup</param>
+        /// <param name="dateFormat">Allows the developer to specify the <see cref="string">date precision</see> for the hash (i.e. "yyyyMMdd" would be a precision for the day)</param>
+        /// <returns>Boolean to indicate succesful update of the ClientDependency.config file</returns>
+        public bool UpdateVersionNumber(SemVersion version, DateTime date, string dateFormat)
+        {
+            var byteContents = Encoding.Unicode.GetBytes(version + date.ToString(dateFormat));
+            
+            //This is a way to convert a string to a long
+            //see https://www.codeproject.com/Articles/34309/Convert-String-to-bit-Integer
+            //We could much more easily use MD5 which would create us an INT but since that is not compliant with
+            //hashing standards we have to use SHA
+            int intHash;
+            using (var hash = SHA256.Create())
+            {
+                var bytes = hash.ComputeHash(byteContents);
+
+                var longResult = new[] { 0, 8, 16, 24 }
+                    .Select(i => BitConverter.ToInt64(bytes, i))
+                    .Aggregate((x, y) => x ^ y);
+
+                //CDF requires an INT, and although this isn't fail safe, it will work for our purposes. We are not hashing for crypto purposes
+                //so there could be some collisions with this conversion but it's not a problem for our purposes
+                //It's also important to note that the long.GetHashCode() implementation in .NET is this: return (int) this ^ (int) (this >> 32);
+                //which means that this value will not change per appdomain like some GetHashCode implementations.
+                intHash = longResult.GetHashCode();
+            }
+
+            try
+            {
+                var clientDependencyConfigXml = XDocument.Load(_fileName, LoadOptions.PreserveWhitespace);
+                if (clientDependencyConfigXml.Root != null)
+                {
+
+                    var versionAttribute = clientDependencyConfigXml.Root.Attribute("version");
+
+                    //Set the new version to the hashcode of now
+                    var oldVersion = versionAttribute.Value;
+                    var newVersion = Math.Abs(intHash).ToString();
+
+                    //don't update if it's the same version
+                    if (oldVersion == newVersion)
+                        return false;
+
+                    versionAttribute.SetValue(newVersion);
+                    clientDependencyConfigXml.Save(_fileName, SaveOptions.DisableFormatting);
+
+                    _logger.Info<ClientDependencyConfiguration>(string.Format("Updated version number from {0} to {1}", oldVersion, newVersion));
+                    return true;
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.Error<ClientDependencyConfiguration>("Couldn't update ClientDependency version number", ex);
+            }
+
+            return false;
+        }
+
         /// <summary>
         /// Changes the version number in ClientDependency.config to a random value to avoid stale caches
         /// </summary>
@@ -107,4 +184,4 @@ namespace Umbraco.Core.Configuration
             return success;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Umbraco.Tests/ObjectExtensionsTests.cs b/src/Umbraco.Tests/ObjectExtensionsTests.cs
index b3b27e30a7..2b00765019 100644
--- a/src/Umbraco.Tests/ObjectExtensionsTests.cs
+++ b/src/Umbraco.Tests/ObjectExtensionsTests.cs
@@ -277,7 +277,7 @@ namespace Umbraco.Tests
         [Test]
         public void ConvertToDateTimeTest()
         {
-            var conv = "2016-06-07".TryConvertTo<DateTime?>();
+            var conv = "2016-06-07".TryConvertTo<DateTime>();
             Assert.IsTrue(conv);
             Assert.AreEqual(new DateTime(2016, 6, 7), conv.Result);
         }
@@ -285,7 +285,7 @@ namespace Umbraco.Tests
         [Test]
         public void ConvertToNullableDateTimeTest()
         {
-            var conv = "2016-06-07".TryConvertTo<DateTime>();
+            var conv = "2016-06-07".TryConvertTo<DateTime?>();
             Assert.IsTrue(conv);
             Assert.AreEqual(new DateTime(2016, 6, 7), conv.Result);
         }
diff --git a/src/Umbraco.Web/Install/Controllers/InstallController.cs b/src/Umbraco.Web/Install/Controllers/InstallController.cs
index 7e3336e1e8..f5859a44b8 100644
--- a/src/Umbraco.Web/Install/Controllers/InstallController.cs
+++ b/src/Umbraco.Web/Install/Controllers/InstallController.cs
@@ -45,8 +45,9 @@ namespace Umbraco.Web.Install.Controllers
             if (ApplicationContext.Current.IsUpgrading)
             {
                 // Update ClientDependency version
-                var clientDependencyConfig = new ClientDependencyConfiguration(ApplicationContext.Current.ProfilingLogger.Logger);
-                var clientDependencyUpdated = clientDependencyConfig.IncreaseVersionNumber();
+                var clientDependencyConfig = new ClientDependencyConfiguration(_umbracoContext.Application.ProfilingLogger.Logger);
+                var clientDependencyUpdated = clientDependencyConfig.UpdateVersionNumber(
+                    UmbracoVersion.GetSemanticVersion(), DateTime.UtcNow, "yyyyMMdd");
                 // Delete ClientDependency temp directories to make sure we get fresh caches
                 var clientDependencyTempFilesDeleted = clientDependencyConfig.ClearTempFiles(HttpContext);