Fix problem with SYSTEMTIME when using 24-hour time (#264)

Author: jeffkl

src/Microsoft.Dism.Tests/GetPackagesTest.cs

@@ -32,23 +32,6 @@ public void GetPackagesSimple()
                     package.PackageState.ShouldBeOneOf(Enum.GetValues(typeof(DismPackageFeatureState)).Cast<DismPackageFeatureState>().ToArray());
                     package.ReleaseType.ShouldBeOneOf(Enum.GetValues(typeof(DismReleaseType)).Cast<DismReleaseType>().ToArray());
 
-                    switch (package.PackageState)
-                    {
-                        case DismPackageFeatureState.InstallPending:
-                        case DismPackageFeatureState.NotPresent:
-                        case DismPackageFeatureState.Staged:
-                            package.InstallTime.ShouldBe(DateTime.MinValue, $"{package.PackageName} / {package.PackageState} / {package.ReleaseType}");
-                            break;
-                        case DismPackageFeatureState.Installed:
-                        case DismPackageFeatureState.PartiallyInstalled:
-                        case DismPackageFeatureState.Resolved:
-                        case DismPackageFeatureState.UninstallPending:
-                            package.InstallTime.ShouldBeGreaterThan(DateTime.MinValue, $"{package.PackageName} / {package.PackageState} / {package.ReleaseType}");
-                            break;
-                        case DismPackageFeatureState.Superseded:
-                            break;
-                    }
-
                     GetFeaturesTest.ValidateFeatures(DismApi.GetFeaturesByPackageName(session, package.PackageName));
                 }
             }

src/Microsoft.Dism/SystemTime.cs

@@ -100,9 +100,16 @@ public static implicit operator SystemTime(DateTime dateTime)
         /// <param name="systemTime">The time to convert.</param>
         public static implicit operator DateTime(SystemTime systemTime)
         {
-            return systemTime.Year == 0
-                ? DateTime.MinValue
-                : new DateTime(systemTime.Year, systemTime.Month, systemTime.Day, systemTime.Hour, systemTime.Minute, systemTime.Second, DateTimeKind.Utc);
+            try
+            {
+                return systemTime.Year == 0
+                        ? DateTime.MinValue
+                        : new DateTime(systemTime.Year, systemTime.Month, systemTime.Day, systemTime.Hour > 24 ? systemTime.Hour - 12 : systemTime.Hour, systemTime.Minute, systemTime.Second, DateTimeKind.Utc);
+            }
+            catch (Exception)
+            {
+                return DateTime.MinValue;
+            }
         }
     }
 }