Fixes #52

.github/workflows/dotnetcore.yml

@@ -8,12 +8,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Setup .NET Core
-      uses: actions/setup-dotnet@v1
+    - uses: actions/checkout@v4
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v4
       with:
         dotnet-version: 10.0.x
-        include-prerelease: true
     - name: Build with dotnet
       run: dotnet build "./src/SimplerSoftware.EntityFrameworkCore.SqlServer.NodaTime.sln" --configuration Release
     # name: Execute Tests

.gitignore

@@ -347,4 +347,7 @@ healthchecksdb
 MigrationBackup/
 
 # Ionide (cross platform F# VS Code tools) working folder
-.ionide/
+.ionide/
+
+# Claude Code local config
+.claude/

src/SimplerSoftware.EntityFrameworkCore.SqlServer.NodaTime.Tests/DateTimeQueryTests.cs

@@ -22,5 +22,42 @@
 
             Assert.Equal(6, raceResults.Count);
         }
+
+        [Fact]
+        public async Task DateTime_UtcNow_Test()
+        {
+            var raceResults = await this.Db.Race.Select(r => new { NowUtc = DateTime.UtcNow }).ToListAsync();
+
+            Assert.Equal(
+                condense(@$"SELECT GETUTCDATE() AS [NowUtc] FROM [Race] AS [r]"),
+                condense(this.Db.Sql));
+
+            Assert.Equal(12, raceResults.Count);
+        }
+
+        [Fact]
+        public async Task DateTime_UtcNow_Compared_Test()
+        {
+            var raceResults = await this.Db.Race.Where(r => r.DateTimeDate.Date >= DateTime.UtcNow).ToListAsync();
+
+            Assert.Equal(
+                condense(@$"{RaceSelectStatement} WHERE CONVERT(date, [r].[DateTimeDate]) >= GETUTCDATE()"),
+                condense(this.Db.Sql));
+
+            Assert.Equal(0, raceResults.Count);
+        }
+
+        [Fact]
+        public async Task DateTime_UtcNow_And_Input_Parameter_Test()
+        {
+            var dt = new DateTime(2019, 7, 1);
+            var raceResults = await this.Db.Race.Where(r => dt >= DateTime.UtcNow).ToListAsync();
+
+            Assert.Equal(
+                condense(@$"{RaceSelectStatement} WHERE @dt >= GETUTCDATE()"),
+                condense(this.Db.Sql));
+
+            Assert.Equal(0, raceResults.Count);
+        }
     }
 }

src/SimplerSoftware.EntityFrameworkCore.SqlServer.NodaTime/SimplerSoftware.EntityFrameworkCore.SqlServer.NodaTime.csproj

@@ -14,7 +14,7 @@
     <RepositoryUrl>https://github.com/StevenRasmussen/EFCore.SqlServer.NodaTime</RepositoryUrl>
     <RepositoryType>git</RepositoryType>
     <PackageTags>Entity Framework Core;entity-framework-core;EF;Data;O/RM;EntityFrameworkCore;EFCore;Noda;NodaTime;Noda Time</PackageTags>
-    <Version>10.0.0</Version>
+    <Version>10.0.1</Version>
     <PackageReadmeFile>README.md</PackageReadmeFile>
   </PropertyGroup>
 

src/SimplerSoftware.EntityFrameworkCore.SqlServer.NodaTime/Storage/SqlServerNodaTimeTypeMappingSourcePlugin.cs

@@ -60,8 +60,12 @@ public RelationalTypeMapping FindMapping(in RelationalTypeMappingInfo mappingInf
             {
                 if (StoreTypeMappings.TryGetValue(storeTypeName, out var mappings))
                 {
+                    // When clrType is null, defer to EF Core's default mapping source: our store
+                    // types (datetime, datetime2, etc.) all have non-NodaTime defaults that EF
+                    // can supply. Returning a NodaTime mapping here pollutes plain DateTime
+                    // expressions like DateTime.UtcNow with InstantValueConverter.
                     if (clrType == null)
-                        return mappings[0];
+                        return null;
 
                     foreach (var m in mappings)
                         if (m.ClrType == clrType)
@@ -73,7 +77,7 @@ public RelationalTypeMapping FindMapping(in RelationalTypeMappingInfo mappingInf
                 if (StoreTypeMappings.TryGetValue(storeTypeNameBase!, out mappings))
                 {
                     if (clrType == null)
-                        return mappings[0].Clone(mappingInfo);
+                        return null;
 
                     foreach (var m in mappings)
                         if (m.ClrType == clrType)