Review

Src/FluentAssertions/AssertionExtensions.cs

@@ -916,6 +916,18 @@ public static void Should<TAssertions>(this DateTimeOffsetAssertions<TAssertions
             InvalidShouldCall();
         }
 
+#if  NET6_0_OR_GREATER
+
+        /// <inheritdoc cref="Should(ExecutionTimeAssertions)" />
+        [Obsolete("You are asserting the 'AndConstraint' itself. Remove the 'Should()' method directly following 'And'", error: true)]
+        public static void Should<TAssertions>(this DateOnlyAssertions<TAssertions> _)
+            where TAssertions : DateOnlyAssertions<TAssertions>
+        {
+            InvalidShouldCall();
+        }
+
+#endif
+
         /// <summary>
         /// You are asserting the <see cref="AndConstraint{T}"/> itself. Remove the <c>Should()</c> method directly following <c>And</c>.
         /// </summary>

Src/FluentAssertions/Formatting/DateOnlyValueFormatter.cs

@@ -22,10 +22,7 @@ public bool CanHandle(object value)
         public void Format(object value, FormattedObjectGraph formattedGraph, FormattingContext context, FormatChild formatChild)
         {
             var dateOnly = (DateOnly)value;
-
-            formattedGraph.AddFragment("<");
-            formattedGraph.AddFragment(dateOnly.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
-            formattedGraph.AddFragment(">");
+            formattedGraph.AddFragment(dateOnly.ToString("<yyyy-MM-dd>", CultureInfo.InvariantCulture));
         }
     }
 }

Src/FluentAssertions/Primitives/DateOnlyAssertions.cs

@@ -11,10 +11,6 @@ namespace FluentAssertions.Primitives
     /// <summary>
     /// Contains a number of methods to assert that a <see cref="DateOnly"/> is in the expected state.
     /// </summary>
-    /// /// <remarks>
-    /// You can use the <see cref="FluentAssertions.Extensions.FluentDateOnlyExtensions"/>
-    /// for a more fluent way of specifying a <see cref="DateOnly"/>.
-    /// </remarks>
     [DebuggerNonUserCode]
     public class DateOnlyAssertions : DateOnlyAssertions<DateOnlyAssertions>
     {
@@ -29,10 +25,6 @@ public DateOnlyAssertions(DateOnly? value)
     /// <summary>
     /// Contains a number of methods to assert that a <see cref="DateOnly"/> is in the expected state.
     /// </summary>
-    /// /// <remarks>
-    /// You can use the <see cref="FluentAssertions.Extensions.FluentDateOnlyExtensions"/>
-    /// for a more fluent way of specifying a <see cref="DateOnly"/>.
-    /// </remarks>
     [DebuggerNonUserCode]
     public class DateOnlyAssertions<TAssertions>
         where TAssertions : DateOnlyAssertions<TAssertions>

Tests/Approval.Tests/ApprovedApi/FluentAssertions/net6.0.verified.txt

@@ -58,6 +58,8 @@ namespace FluentAssertions
         public static FluentAssertions.Specialized.ActionAssertions Should(this System.Action action) { }
         public static FluentAssertions.Collections.StringCollectionAssertions Should(this System.Collections.Generic.IEnumerable<string> @this) { }
         public static FluentAssertions.Data.DataColumnAssertions Should(this System.Data.DataColumn actualValue) { }
+        public static FluentAssertions.Primitives.DateOnlyAssertions Should(this System.DateOnly actualValue) { }
+        public static FluentAssertions.Primitives.NullableDateOnlyAssertions Should(this System.DateOnly? actualValue) { }
         public static FluentAssertions.Primitives.DateTimeAssertions Should(this System.DateTime actualValue) { }
         public static FluentAssertions.Primitives.NullableDateTimeAssertions Should(this System.DateTime? actualValue) { }
         public static FluentAssertions.Primitives.DateTimeOffsetAssertions Should(this System.DateTimeOffset actualValue) { }
@@ -110,6 +112,10 @@ namespace FluentAssertions
             where TAssertions : FluentAssertions.Primitives.BooleanAssertions<TAssertions> { }
         [System.Obsolete("You are asserting the \'AndConstraint\' itself. Remove the \'Should()\' method direct" +
             "ly following \'And\'", true)]
+        public static void Should<TAssertions>(this FluentAssertions.Primitives.DateOnlyAssertions<TAssertions> _)
+            where TAssertions : FluentAssertions.Primitives.DateOnlyAssertions<TAssertions> { }
+        [System.Obsolete("You are asserting the \'AndConstraint\' itself. Remove the \'Should()\' method direct" +
+            "ly following \'And\'", true)]
         public static void Should<TAssertions>(this FluentAssertions.Primitives.DateTimeAssertions<TAssertions> _)
             where TAssertions : FluentAssertions.Primitives.DateTimeAssertions<TAssertions> { }
         [System.Obsolete("You are asserting the \'AndConstraint\' itself. Remove the \'Should()\' method direct" +
@@ -1436,6 +1442,12 @@ namespace FluentAssertions.Formatting
         public bool CanHandle(object value) { }
         public void Format(object value, FluentAssertions.Formatting.FormattedObjectGraph formattedGraph, FluentAssertions.Formatting.FormattingContext context, FluentAssertions.Formatting.FormatChild formatChild) { }
     }
+    public class DateOnlyValueFormatter : FluentAssertions.Formatting.IValueFormatter
+    {
+        public DateOnlyValueFormatter() { }
+        public bool CanHandle(object value) { }
+        public void Format(object value, FluentAssertions.Formatting.FormattedObjectGraph formattedGraph, FluentAssertions.Formatting.FormattingContext context, FluentAssertions.Formatting.FormatChild formatChild) { }
+    }
     public class DateTimeOffsetValueFormatter : FluentAssertions.Formatting.IValueFormatter
     {
         public DateTimeOffsetValueFormatter() { }
@@ -1755,6 +1767,39 @@ namespace FluentAssertions.Primitives
         public override bool Equals(object obj) { }
         public FluentAssertions.AndConstraint<TAssertions> NotBe(bool unexpected, string because = "", params object[] becauseArgs) { }
     }
+    public class DateOnlyAssertions : FluentAssertions.Primitives.DateOnlyAssertions<FluentAssertions.Primitives.DateOnlyAssertions>
+    {
+        public DateOnlyAssertions(System.DateOnly? value) { }
+    }
+    public class DateOnlyAssertions<TAssertions>
+        where TAssertions : FluentAssertions.Primitives.DateOnlyAssertions<TAssertions>
+    {
+        public DateOnlyAssertions(System.DateOnly? value) { }
+        public System.DateOnly? Subject { get; }
+        public FluentAssertions.AndConstraint<TAssertions> Be(System.DateOnly expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> Be(System.DateOnly? expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeAfter(System.DateOnly expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeBefore(System.DateOnly expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeOnOrAfter(System.DateOnly expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeOnOrBefore(System.DateOnly expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeOneOf(params System.DateOnly[] validValues) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeOneOf(params System.Nullable<System.DateOnly>[] validValues) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeOneOf(System.Collections.Generic.IEnumerable<System.DateOnly> validValues, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeOneOf(System.Collections.Generic.IEnumerable<System.DateOnly?> validValues, string because = "", params object[] becauseArgs) { }
+        public override bool Equals(object obj) { }
+        public FluentAssertions.AndConstraint<TAssertions> HaveDay(int expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> HaveMonth(int expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> HaveYear(int expected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBe(System.DateOnly unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBe(System.DateOnly? unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBeAfter(System.DateOnly unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBeBefore(System.DateOnly unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBeOnOrAfter(System.DateOnly unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBeOnOrBefore(System.DateOnly unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotHaveDay(int unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotHaveMonth(int unexpected, string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotHaveYear(int unexpected, string because = "", params object[] becauseArgs) { }
+    }
     public class DateTimeAssertions : FluentAssertions.Primitives.DateTimeAssertions<FluentAssertions.Primitives.DateTimeAssertions>
     {
         public DateTimeAssertions(System.DateTime? value) { }
@@ -1956,6 +2001,19 @@ namespace FluentAssertions.Primitives
         public FluentAssertions.AndConstraint<TAssertions> NotBeTrue(string because = "", params object[] becauseArgs) { }
         public FluentAssertions.AndConstraint<TAssertions> NotHaveValue(string because = "", params object[] becauseArgs) { }
     }
+    public class NullableDateOnlyAssertions : FluentAssertions.Primitives.NullableDateOnlyAssertions<FluentAssertions.Primitives.NullableDateOnlyAssertions>
+    {
+        public NullableDateOnlyAssertions(System.DateOnly? expected) { }
+    }
+    public class NullableDateOnlyAssertions<TAssertions> : FluentAssertions.Primitives.DateOnlyAssertions<TAssertions>
+        where TAssertions : FluentAssertions.Primitives.NullableDateOnlyAssertions<TAssertions>
+    {
+        public NullableDateOnlyAssertions(System.DateOnly? expected) { }
+        public FluentAssertions.AndConstraint<TAssertions> BeNull(string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> HaveValue(string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotBeNull(string because = "", params object[] becauseArgs) { }
+        public FluentAssertions.AndConstraint<TAssertions> NotHaveValue(string because = "", params object[] becauseArgs) { }
+    }
     public class NullableDateTimeAssertions : FluentAssertions.Primitives.NullableDateTimeAssertions<FluentAssertions.Primitives.NullableDateTimeAssertions>
     {
         public NullableDateTimeAssertions(System.DateTime? expected) { }

Tests/FluentAssertions.Specs/AssertionExtensionsSpecs.cs

@@ -32,8 +32,6 @@ private static bool OverridesEquals(Type t)
             return equals is not null;
         }
 
-#if !NET6_0_OR_GREATER
-
         [Fact]
         public void Should_methods_have_a_matching_overload_to_guard_against_chaining_and_constraints()
         {
@@ -66,8 +64,6 @@ public void Should_methods_have_a_matching_overload_to_guard_against_chaining_an
         private static bool IsGuardOverload(MethodInfo m) =>
             m.ReturnType == typeof(void) && m.IsDefined(typeof(ObsoleteAttribute));
 
-#endif
-
         private static Type GetMostParentType(Type type)
         {
             while (type.BaseType != typeof(object))