Fixes: U4-7090 Upgrade error with dates

src/Umbraco.Core/Persistence/Migrations/MigrationExpressionBase.cs

@@ -76,6 +76,8 @@ namespace Umbraco.Core.Persistence.Migrations
                 case TypeCode.UInt32:
                 case TypeCode.UInt64:
                     return val.ToString();
+                case TypeCode.DateTime:
+                    return SqlSyntax.FormatDateTime((DateTime) val);
                 default:
                     return SqlSyntaxContext.SqlSyntaxProvider.GetQuotedValue(val.ToString());
             }

src/Umbraco.Core/Persistence/SqlSyntax/ISqlSyntaxProvider.cs

@@ -54,6 +54,7 @@ namespace Umbraco.Core.Persistence.SqlSyntax
         string DeleteConstraint { get; }
         string CreateForeignKeyConstraint { get; }
         string DeleteDefaultConstraint { get; }
+        string FormatDateTime(DateTime date, bool includeTime = true);
         string Format(TableDefinition table);
         string Format(IEnumerable<ColumnDefinition> columns);
         List<string> Format(IEnumerable<IndexDefinition> indexes);

src/Umbraco.Core/Persistence/SqlSyntax/MySqlSyntaxProvider.cs

@@ -191,6 +191,21 @@ ORDER BY TABLE_NAME, INDEX_NAME",
             return false;
         }
 
+        /// <summary>
+        /// This is used ONLY if we need to format datetime without using SQL parameters (i.e. during migrations)
+        /// </summary>
+        /// <param name="date"></param>
+        /// <param name="includeTime"></param>
+        /// <returns></returns>
+        /// <remarks>
+        /// MySQL has a DateTime standard that is unambiguous and works on all servers:
+        /// YYYYMMDDHHMMSS
+        /// </remarks>
+        public override string FormatDateTime(DateTime date, bool includeTime = true)
+        {
+            return includeTime ? date.ToString("YYYYMMDDHHmmss") : date.ToString("YYYYMMDD");
+        }
+
         public override string GetQuotedTableName(string tableName)
         {
             return string.Format("`{0}`", tableName);

src/Umbraco.Core/Persistence/SqlSyntax/SqlSyntaxProviderBase.cs

@@ -251,6 +251,21 @@ namespace Umbraco.Core.Persistence.SqlSyntax
             return true;
         }
 
+        /// <summary>
+        /// This is used ONLY if we need to format datetime without using SQL parameters (i.e. during migrations)
+        /// </summary>
+        /// <param name="date"></param>
+        /// <param name="includeTime"></param>
+        /// <returns></returns>
+        /// <remarks>
+        /// MSSQL has a DateTime standard that is unambiguous and works on all servers:
+        /// YYYYMMDD HH:mm:ss
+        /// </remarks>
+        public virtual string FormatDateTime(DateTime date, bool includeTime = true)
+        {
+            return includeTime ? date.ToString("YYYYMMDD HH:mm:ss") : date.ToString("YYYYMMDD");
+        }
+
         public virtual string Format(TableDefinition table)
         {
             var statement = string.Format(CreateTable, GetQuotedTableName(table.Name), Format(table.Columns));