diff --git a/docs/pages/how-to/deal-with-dates.md b/docs/pages/how-to/deal-with-dates.md
index 65e5f300..fa9470f8 100644
--- a/docs/pages/how-to/deal-with-dates.md
+++ b/docs/pages/how-to/deal-with-dates.md
@@ -1,7 +1,7 @@
 # Dealing with dates
 
 When the mapper builds a date object, it has to know which format(s) are
-supported. By default, any valid timestamp or ATOM-formatted value will be
+supported. By default, any valid timestamp or RFC 3339-formatted value will be
 accepted.
 
 If other formats are to be supported, they need to be registered using the
diff --git a/src/Library/Settings.php b/src/Library/Settings.php
index 143eac2f..54d2617d 100644
--- a/src/Library/Settings.php
+++ b/src/Library/Settings.php
@@ -14,7 +14,11 @@
 final class Settings
 {
     /** @var non-empty-array<non-empty-string> */
-    public const DEFAULT_SUPPORTED_DATETIME_FORMATS = [DATE_ATOM, 'U'];
+    public const DEFAULT_SUPPORTED_DATETIME_FORMATS = [
+        'Y-m-d\\TH:i:sP', // RFC 3339
+        'Y-m-d\\TH:i:s.uP', // RFC 3339 with microseconds
+        'U', // Unix Timestamp
+    ];
 
     /** @var array<class-string|interface-string, callable> */
     public array $inferredMapping = [];
diff --git a/src/Mapper/Object/DateTimeFormatConstructor.php b/src/Mapper/Object/DateTimeFormatConstructor.php
index 2e2c53f8..98298f22 100644
--- a/src/Mapper/Object/DateTimeFormatConstructor.php
+++ b/src/Mapper/Object/DateTimeFormatConstructor.php
@@ -14,7 +14,7 @@
  * date formats should be allowed during mapping.
  *
  * By default, if this constructor is never registered, the dates will accept
- * any valid timestamp or ATOM-formatted value.
+ * any valid timestamp or RFC 3339-formatted value.
  *
  * Usage:
  *
diff --git a/src/MapperBuilder.php b/src/MapperBuilder.php
index 30c191fa..3cce949e 100644
--- a/src/MapperBuilder.php
+++ b/src/MapperBuilder.php
@@ -219,7 +219,7 @@ public function registerConstructor(callable|string ...$constructors): self
     /**
      * Describes which date formats will be supported during mapping.
      *
-     * By default, the dates will accept any valid timestamp or ATOM-formatted
+     * By default, the dates will accept any valid timestamp or RFC 3339-formatted
      * value.
      *
      * ```php
@@ -244,7 +244,7 @@ public function supportDateFormats(string $format, string ...$formats): self
     /**
      * Returns the date formats supported during mapping.
      *
-     * By default, any valid timestamp or ATOM-formatted value are accepted.
+     * By default, any valid timestamp or RFC 3339-formatted value are accepted.
      * Custom formats can be set using method `supportDateFormats()`.
      *
      * @return non-empty-array<non-empty-string>
diff --git a/tests/Integration/Mapping/Object/DateTimeMappingTest.php b/tests/Integration/Mapping/Object/DateTimeMappingTest.php
index b9803a04..cb3bac5a 100644
--- a/tests/Integration/Mapping/Object/DateTimeMappingTest.php
+++ b/tests/Integration/Mapping/Object/DateTimeMappingTest.php
@@ -24,7 +24,7 @@ public function test_default_datetime_constructor_cannot_be_used(): void
         }
     }
 
-    public function test_default_date_constructor_with_valid_atom_format_source_returns_datetime(): void
+    public function test_default_date_constructor_with_valid_rfc_3339_format_source_returns_datetime(): void
     {
         try {
             $result = (new MapperBuilder())
@@ -37,6 +37,36 @@ public function test_default_date_constructor_with_valid_atom_format_source_retu
         self::assertSame('2022-08-05T08:32:06+00:00', $result->format(DATE_ATOM));
     }
 
+    public function test_default_date_constructor_with_valid_rfc_3339_and_milliseconds_format_source_returns_datetime(): void
+    {
+        try {
+            $result = (new MapperBuilder())
+                ->mapper()
+                ->map(DateTimeInterface::class, '2022-08-05T08:32:06.123Z');
+        } catch (MappingError $error) {
+            $this->mappingFail($error);
+        }
+
+        self::assertSame('1659688326', $result->format('U'));
+        self::assertSame('123', $result->format('v'));
+        self::assertSame('123000', $result->format('u'));
+    }
+
+    public function test_default_date_constructor_with_valid_rfc_3339_and_microseconds_format_source_returns_datetime(): void
+    {
+        try {
+            $result = (new MapperBuilder())
+                ->mapper()
+                ->map(DateTimeInterface::class, '2022-08-05T08:32:06.123456Z');
+        } catch (MappingError $error) {
+            $this->mappingFail($error);
+        }
+
+        self::assertSame('1659688326', $result->format('U'));
+        self::assertSame('123', $result->format('v'));
+        self::assertSame('123456', $result->format('u'));
+    }
+
     public function test_default_date_constructor_with_valid_timestamp_format_source_returns_datetime(): void
     {
         try {
@@ -100,7 +130,7 @@ public function test_default_date_constructor_with_invalid_source_throws_excepti
             $error = $exception->node()->messages()[0];
 
             self::assertSame('1630686564', $error->code());
-            self::assertSame("Value 'invalid datetime' does not match any of the following formats: `Y-m-d\TH:i:sP`, `U`.", (string)$error);
+            self::assertSame("Value 'invalid datetime' does not match any of the following formats: `Y-m-d\TH:i:sP`, `Y-m-d\TH:i:s.uP`, `U`.", (string)$error);
         }
     }
 
diff --git a/tests/Unit/MapperBuilderTest.php b/tests/Unit/MapperBuilderTest.php
index bd15c959..584be3f2 100644
--- a/tests/Unit/MapperBuilderTest.php
+++ b/tests/Unit/MapperBuilderTest.php
@@ -54,7 +54,7 @@ public function test_mapper_instance_is_the_same(): void
 
     public function test_get_supported_date_formats_returns_defaults_formats_when_not_overridden(): void
     {
-        self::assertSame([DATE_ATOM, 'U'], $this->mapperBuilder->supportedDateFormats());
+        self::assertSame(['Y-m-d\\TH:i:sP', 'Y-m-d\\TH:i:s.uP', 'U'], $this->mapperBuilder->supportedDateFormats());
     }
 
     public function test_get_supported_date_formats_returns_configured_values(): void