diff --git a/src/JsonApiDotNetCore/Controllers/BaseJsonApiOperationsController.cs b/src/JsonApiDotNetCore/Controllers/BaseJsonApiOperationsController.cs
index 2ea8f89a87..596b22794d 100644
--- a/src/JsonApiDotNetCore/Controllers/BaseJsonApiOperationsController.cs
+++ b/src/JsonApiDotNetCore/Controllers/BaseJsonApiOperationsController.cs
@@ -166,7 +166,8 @@ private int ValidateOperation(OperationContainer operation, int operationIndex,
                 ModelState =
                 {
                     MaxAllowedErrors = maxErrorsRemaining
-                }
+                },
+                HttpContext = HttpContext
             };
 
             ObjectValidator.Validate(validationContext, null, string.Empty, operation.Resource);
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceTests.cs
index 048ef5506f..dcd38763c9 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceTests.cs
@@ -3,6 +3,7 @@
 using FluentAssertions.Extensions;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Serialization.Objects;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using TestBuildingBlocks;
@@ -26,6 +27,11 @@ public AtomicCreateResourceTests(IntegrationTestContext<TestableStartup<Operatio
         testContext.UseController<MusicTracksController>();
         testContext.UseController<PlaylistsController>();
 
+        testContext.ConfigureServicesBeforeStartup(services =>
+        {
+            services.AddSingleton<ISystemClock, FrozenSystemClock>();
+        });
+
         var options = (JsonApiOptions)testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
         options.AllowUnknownFieldsInRequestBody = false;
     }
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceWithClientGeneratedIdTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceWithClientGeneratedIdTests.cs
index 62907c047a..6e9a21d773 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceWithClientGeneratedIdTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Creating/AtomicCreateResourceWithClientGeneratedIdTests.cs
@@ -2,6 +2,7 @@
 using FluentAssertions;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Serialization.Objects;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.Extensions.DependencyInjection;
 using TestBuildingBlocks;
 using Xunit;
@@ -28,6 +29,7 @@ public AtomicCreateResourceWithClientGeneratedIdTests(IntegrationTestContext<Tes
             services.AddResourceDefinition<ImplicitlyChangingTextLanguageDefinition>();
 
             services.AddSingleton<ResourceDefinitionHitCounter>();
+            services.AddSingleton<ISystemClock, FrozenSystemClock>();
         });
 
         var options = (JsonApiOptions)testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/DateMustBeInThePastAttribute.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/DateMustBeInThePastAttribute.cs
new file mode 100644
index 0000000000..0421f2e396
--- /dev/null
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/DateMustBeInThePastAttribute.cs
@@ -0,0 +1,34 @@
+using System.ComponentModel.DataAnnotations;
+using System.Reflection;
+using JsonApiDotNetCore.Resources;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace JsonApiDotNetCoreTests.IntegrationTests.AtomicOperations;
+
+[AttributeUsage(AttributeTargets.Property)]
+internal sealed class DateMustBeInThePastAttribute : ValidationAttribute
+{
+    protected override ValidationResult? IsValid(object? value, ValidationContext validationContext)
+    {
+        var targetedFields = validationContext.GetRequiredService<ITargetedFields>();
+
+        if (targetedFields.Attributes.Any(attribute => attribute.Property.Name == validationContext.MemberName))
+        {
+            PropertyInfo propertyInfo = validationContext.ObjectType.GetProperty(validationContext.MemberName!)!;
+
+            if (propertyInfo.PropertyType == typeof(DateTimeOffset) || propertyInfo.PropertyType == typeof(DateTimeOffset?))
+            {
+                var typedValue = (DateTimeOffset?)propertyInfo.GetValue(validationContext.ObjectInstance);
+                var systemClock = validationContext.GetRequiredService<ISystemClock>();
+
+                if (typedValue >= systemClock.UtcNow)
+                {
+                    return new ValidationResult($"{validationContext.MemberName} must be in the past.");
+                }
+            }
+        }
+
+        return ValidationResult.Success;
+    }
+}
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Meta/AtomicResourceMetaTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Meta/AtomicResourceMetaTests.cs
index 12875231b6..2bd9dc8edf 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Meta/AtomicResourceMetaTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Meta/AtomicResourceMetaTests.cs
@@ -4,6 +4,7 @@
 using FluentAssertions.Extensions;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Serialization.Objects;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.Extensions.DependencyInjection;
 using TestBuildingBlocks;
 using Xunit;
@@ -27,6 +28,7 @@ public AtomicResourceMetaTests(IntegrationTestContext<TestableStartup<Operations
             services.AddResourceDefinition<TextLanguageMetaDefinition>();
 
             services.AddSingleton<ResourceDefinitionHitCounter>();
+            services.AddSingleton<ISystemClock, FrozenSystemClock>();
         });
 
         var hitCounter = _testContext.Factory.Services.GetRequiredService<ResourceDefinitionHitCounter>();
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/ModelStateValidation/AtomicModelStateValidationTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/ModelStateValidation/AtomicModelStateValidationTests.cs
index 0eadc45f2c..03a04fb431 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/ModelStateValidation/AtomicModelStateValidationTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/ModelStateValidation/AtomicModelStateValidationTests.cs
@@ -1,7 +1,9 @@
 using System.Net;
 using FluentAssertions;
 using JsonApiDotNetCore.Serialization.Objects;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
 using TestBuildingBlocks;
 using Xunit;
 
@@ -16,6 +18,11 @@ public AtomicModelStateValidationTests(IntegrationTestContext<TestableStartup<Op
     {
         _testContext = testContext;
 
+        _testContext.ConfigureServicesBeforeStartup(services =>
+        {
+            services.AddSingleton<ISystemClock, FrozenSystemClock>();
+        });
+
         testContext.UseController<OperationsController>();
     }
 
@@ -67,6 +74,51 @@ public async Task Cannot_create_resource_with_multiple_violations()
         error2.Source.Pointer.Should().Be("/atomic:operations[0]/data/attributes/lengthInSeconds");
     }
 
+    [Fact]
+    public async Task Cannot_create_resource_when_violation_from_custom_ValidationAttribute()
+    {
+        // Arrange
+        var clock = _testContext.Factory.Services.GetRequiredService<ISystemClock>();
+
+        var requestBody = new
+        {
+            atomic__operations = new[]
+            {
+                new
+                {
+                    op = "add",
+                    data = new
+                    {
+                        type = "musicTracks",
+                        attributes = new
+                        {
+                            title = "some",
+                            lengthInSeconds = 120,
+                            releasedAt = clock.UtcNow.AddDays(1)
+                        }
+                    }
+                }
+            }
+        };
+
+        const string route = "/operations";
+
+        // Act
+        (HttpResponseMessage httpResponse, Document responseDocument) = await _testContext.ExecutePostAtomicAsync<Document>(route, requestBody);
+
+        // Assert
+        httpResponse.ShouldHaveStatusCode(HttpStatusCode.UnprocessableEntity);
+
+        responseDocument.Errors.ShouldHaveCount(1);
+
+        ErrorObject error = responseDocument.Errors[0];
+        error.StatusCode.Should().Be(HttpStatusCode.UnprocessableEntity);
+        error.Title.Should().Be("Input validation failed.");
+        error.Detail.Should().Be("ReleasedAt must be in the past.");
+        error.Source.ShouldNotBeNull();
+        error.Source.Pointer.Should().Be("/atomic:operations[0]/data/attributes/releasedAt");
+    }
+
     [Fact]
     public async Task Can_create_resource_with_annotated_relationship()
     {
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/MusicTrack.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/MusicTrack.cs
index 646a0d9ed9..52ed0ae98b 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/MusicTrack.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/MusicTrack.cs
@@ -23,6 +23,7 @@ public sealed class MusicTrack : Identifiable<Guid>
     public string? Genre { get; set; }
 
     [Attr]
+    [DateMustBeInThePast]
     public DateTimeOffset ReleasedAt { get; set; }
 
     [HasOne]
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Updating/Resources/AtomicUpdateResourceTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Updating/Resources/AtomicUpdateResourceTests.cs
index eb9f81b6e6..2371ab092a 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Updating/Resources/AtomicUpdateResourceTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Updating/Resources/AtomicUpdateResourceTests.cs
@@ -3,6 +3,7 @@
 using FluentAssertions.Extensions;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Serialization.Objects;
+using Microsoft.AspNetCore.Authentication;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using TestBuildingBlocks;
@@ -29,6 +30,7 @@ public AtomicUpdateResourceTests(IntegrationTestContext<TestableStartup<Operatio
             services.AddResourceDefinition<ImplicitlyChangingTextLanguageDefinition>();
 
             services.AddSingleton<ResourceDefinitionHitCounter>();
+            services.AddSingleton<ISystemClock, FrozenSystemClock>();
         });
 
         var options = (JsonApiOptions)testContext.Factory.Services.GetRequiredService<IJsonApiOptions>();
diff --git a/test/TestBuildingBlocks/FakerContainer.cs b/test/TestBuildingBlocks/FakerContainer.cs
index 99cce6e04c..72f9a05567 100644
--- a/test/TestBuildingBlocks/FakerContainer.cs
+++ b/test/TestBuildingBlocks/FakerContainer.cs
@@ -12,7 +12,7 @@ static FakerContainer()
     {
         // Setting the system DateTime to kind Utc, so that faker calls like PastOffset() don't depend on the system time zone.
         // See https://docs.microsoft.com/en-us/dotnet/api/system.datetimeoffset.op_implicit?view=net-6.0#remarks
-        Date.SystemClock = () => 1.January(2020).AsUtc();
+        Date.SystemClock = () => 1.January(2020).At(1, 1, 1).AsUtc();
     }
 
     protected static int GetFakerSeed()
diff --git a/test/TestBuildingBlocks/FrozenSystemClock.cs b/test/TestBuildingBlocks/FrozenSystemClock.cs
index 0f757c63a5..a1d85e1fcc 100644
--- a/test/TestBuildingBlocks/FrozenSystemClock.cs
+++ b/test/TestBuildingBlocks/FrozenSystemClock.cs
@@ -5,7 +5,7 @@ namespace TestBuildingBlocks;
 
 public sealed class FrozenSystemClock : ISystemClock
 {
-    private static readonly DateTimeOffset DefaultTime = 1.January(2000).At(1, 1, 1).AsUtc();
+    private static readonly DateTimeOffset DefaultTime = 1.January(2020).At(1, 1, 1).AsUtc();
 
     public DateTimeOffset UtcNow { get; set; } = DefaultTime;
 }