Fix MySQL test execution time + Fix DateTime GraphQL input handling

src/Core/Resolvers/Sql Query Structures/BaseSqlQueryStructure.cs

@@ -439,7 +439,14 @@ protected static object ParseParamAsSystemType(string param, Type systemType)
                 "Double" => double.Parse(param),
                 "Decimal" => decimal.Parse(param),
                 "Boolean" => bool.Parse(param),
-                "DateTime" => DateTimeOffset.Parse(param, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.AssumeUniversal).DateTime,
+                // When GraphQL input specifies a TZ offset "12-31-2024T12:00:00+03:00"
+                // and DAB has resolved the ColumnDefinition.SystemType to DateTime,
+                // DAB converts the input to UTC because:
+                // - DAB assumes that values without timezone offset are UTC.
+                // - DAB shouldn't store values in the backend database which the user did not intend
+                //   - e.g. Storing this value for the original example would be incorrect: "12-31-2024T12:00:00"
+                //   - The correct value to store would be "12-31-2024T09:00:00" (UTC)
+                "DateTime" => DateTimeOffset.Parse(param, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.AssumeUniversal).UtcDateTime,
                 "DateTimeOffset" => DateTimeOffset.Parse(param, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.AssumeUniversal),
                 "Date" => DateOnly.Parse(param),
                 "Guid" => Guid.Parse(param),

src/Service.Tests/SqlTests/GraphQLSupportedTypesTests/DabField.cs

@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+namespace Azure.DataApiBuilder.Service.Tests.SqlTests.GraphQLSupportedTypesTests;
+
+/// <summary>
+/// Encapsulates field name metadata which is used when
+/// creating database queries to validate test results
+/// in the GraphQLSupportedTypesTestBase.
+/// </summary>
+public class DabField
+{
+    /// <summary>
+    /// Mapped (aliased) column name defined in DAB runtime config.
+    /// </summary>
+    public string Alias { get; set; }
+
+    /// <summary>
+    /// Database column name.
+    /// </summary>
+    public string BackingColumnName { get; set; }
+
+    /// <summary>
+    /// Creates a new DabField instance with both alias and backing column name.
+    /// </summary>
+    /// <param name="alias">Mapped (aliased) column name defined in DAB runtime config.</param>
+    /// <param name="backingColumnName">Database column name.</param>
+    public DabField(string alias, string backingColumnName)
+    {
+        Alias = alias;
+        BackingColumnName = backingColumnName;
+    }
+
+    /// <summary>
+    /// Creates a new DabField instance with only the backing column name
+    /// where the alias is the same as the backing column name.
+    /// </summary>
+    /// <param name="backingColumnName">Database column name.</param>
+    public DabField(string backingColumnName)
+    {
+        Alias = backingColumnName;
+        BackingColumnName = backingColumnName;
+    }
+}