From 39599c0a9419f7f922e926f9e3d68a3439fb784c Mon Sep 17 00:00:00 2001
From: Vladimir Pecanac <vladimir.pecanac@gmail.com>
Date: Sun, 30 Aug 2026 18:22:38 +0200
Subject: [PATCH] DateTime.Now vs DateTime.UtcNow: retarget net10.0, bump test
 packages, add Unspecified conversion tests

- Both projects net6.0 -> net10.0
- Microsoft.NET.Test.Sdk 16.11.0 -> 18.9.0, MSTest 2.2.7 -> 4.3.3, coverlet.collector 3.1.0 -> 10.0.1
- Two tests pinning the DateTimeKind.Unspecified asymmetry: ToLocalTime() treats an
  unspecified value as UTC, ToUniversalTime() treats it as local. Written offset-agnostic
  so they hold in a UTC CI container.
---
 .../DateTimeNow.Tests.csproj                  | 10 ++++-----
 .../DateTimeNow.Tests/DateTimeTests.cs        | 22 +++++++++++++++++++
 .../DateTimeNowVsDateTimeUtcNow.csproj        |  2 +-
 3 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeNow.Tests.csproj b/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeNow.Tests.csproj
index f72bee824b..7af97066cb 100644
--- a/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeNow.Tests.csproj
+++ b/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeNow.Tests.csproj
@@ -1,17 +1,17 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
-    <PackageReference Include="MSTest.TestAdapter" Version="2.2.7" />
-    <PackageReference Include="MSTest.TestFramework" Version="2.2.7" />
-    <PackageReference Include="coverlet.collector" Version="3.1.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.9.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="4.3.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="4.3.3" />
+    <PackageReference Include="coverlet.collector" Version="10.0.1" />
   </ItemGroup>
 
 </Project>
diff --git a/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeTests.cs b/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeTests.cs
index f50512e983..918ef9b180 100644
--- a/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeTests.cs
+++ b/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNow.Tests/DateTimeTests.cs
@@ -56,5 +56,27 @@ public void LocalDate_ConvertToUTC_ReturnsUTCDate()
 
             Assert.IsTrue(now.Kind == DateTimeKind.Local && utc.Kind == DateTimeKind.Utc);
         }
+
+        [TestMethod]
+        public void UnspecifiedDate_WhenConvertedToLocalTime_IsTreatedAsUtc()
+        {
+            var value = new DateTime(2022, 1, 9, 14, 34, 42);
+
+            var unspecified = DateTime.SpecifyKind(value, DateTimeKind.Unspecified);
+            var asUtc = DateTime.SpecifyKind(value, DateTimeKind.Utc);
+
+            Assert.AreEqual(asUtc.ToLocalTime(), unspecified.ToLocalTime());
+        }
+
+        [TestMethod]
+        public void UnspecifiedDate_WhenConvertedToUniversalTime_IsTreatedAsLocal()
+        {
+            var value = new DateTime(2022, 1, 9, 14, 34, 42);
+
+            var unspecified = DateTime.SpecifyKind(value, DateTimeKind.Unspecified);
+            var asLocal = DateTime.SpecifyKind(value, DateTimeKind.Local);
+
+            Assert.AreEqual(asLocal.ToUniversalTime(), unspecified.ToUniversalTime());
+        }
     }
 }
\ No newline at end of file
diff --git a/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow.csproj b/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow.csproj
index 74abf5c976..dfb40caafc 100644
--- a/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow.csproj
+++ b/dotnet-datetime/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow/DateTimeNowVsDateTimeUtcNow.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net10.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>