Fixes : U4-2055 Unpublish Date Bug in Umbraco 6.0.3 -> with unit test to ensure that all dates are formatted as ISO date standards when used in SQL

src/Umbraco.Core/DateTimeExtensions.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Umbraco.Core
+{
+    public static class DateTimeExtensions
+    {
+
+        /// <summary>
+        /// Returns the DateTime as an ISO formatted string that is globally expectable
+        /// </summary>
+        /// <param name="dt"></param>
+        /// <returns></returns>
+        public static string ToIsoString(this DateTime dt)
+        {
+            return dt.ToString("yyyy-MM-dd HH:mm:ss");
+        }
+
+    }
+}

src/Umbraco.Core/Persistence/Querying/ModelToSqlExpressionHelper.cs

@@ -456,7 +456,10 @@ namespace Umbraco.Core.Persistence.Querying
                 return ((decimal)value).ToString(CultureInfo.InvariantCulture);
 
             if (fieldType == typeof (DateTime))
-                return "'" + EscapeParam(((DateTime)value).ToString(CultureInfo.InvariantCulture)) + "'";
+            {
+                return "'" + EscapeParam(((DateTime)value).ToIsoString()) + "'";
+            }
+                
             
             if (fieldType == typeof(bool))
                 return ((bool)value) ? Convert.ToString(1, CultureInfo.InvariantCulture) : Convert.ToString(0, CultureInfo.InvariantCulture);

src/Umbraco.Core/Persistence/Querying/PocoToSqlExpressionHelper.cs

@@ -466,7 +466,10 @@ namespace Umbraco.Core.Persistence.Querying
                 return ((decimal)value).ToString(CultureInfo.InvariantCulture);
 
             if (fieldType == typeof (DateTime))
-                return "'" + EscapeParam(((DateTime)value).ToString(CultureInfo.InvariantCulture)) + "'";
+            {
+                return "'" + EscapeParam(((DateTime)value).ToIsoString()) + "'";
+            }
+                
 
             if (fieldType == typeof(bool))
                 return ((bool)value) ? Convert.ToString(1, CultureInfo.InvariantCulture) : Convert.ToString(0, CultureInfo.InvariantCulture);

src/Umbraco.Core/Umbraco.Core.csproj

@@ -140,6 +140,7 @@
     <Compile Include="CoreBootManager.cs" />
     <Compile Include="DatabaseContext.cs" />
     <Compile Include="DataTableExtensions.cs" />
+    <Compile Include="DateTimeExtensions.cs" />
     <Compile Include="DictionaryExtensions.cs" />
     <Compile Include="Dictionary\CultureDictionaryFactoryResolver.cs" />
     <Compile Include="Dictionary\ICultureDictionaryFactory.cs" />

src/Umbraco.Tests/Persistence/Querying/QueryBuilderTests.cs

@@ -12,6 +12,22 @@ namespace Umbraco.Tests.Persistence.Querying
     [TestFixture]
     public class QueryBuilderTests : BaseUsingSqlCeSyntax
     {
+        [Test]
+        public void Dates_Formatted_Properly()
+        {
+            var sql = new Sql();
+            sql.Select("*").From<DocumentDto>();
+
+            var dt = new DateTime(2013, 11, 21, 13, 25, 55);
+
+            var query = Query<IContent>.Builder.Where(x => x.ExpireDate <= dt);
+            var translator = new SqlTranslator<IContent>(sql, query);
+
+            var result = translator.Translate();
+
+            Assert.IsTrue(result.SQL.Contains("[expireDate] <= '2013-11-21 13:25:55'"));
+        }
+
         [Test]
         public void Can_Build_StartsWith_Query_For_IContent()
         {