diff --git a/docs/pages/how-to/deal-with-dates.md b/docs/pages/how-to/deal-with-dates.md
index fa9470f8..b8d62fe1 100644
--- a/docs/pages/how-to/deal-with-dates.md
+++ b/docs/pages/how-to/deal-with-dates.md
@@ -2,7 +2,7 @@
 
 When the mapper builds a date object, it has to know which format(s) are
 supported. By default, any valid timestamp or RFC 3339-formatted value will be
-accepted.
+accepted with or without microseconds.
 
 If other formats are to be supported, they need to be registered using the
 following method:
diff --git a/src/Library/Settings.php b/src/Library/Settings.php
index 653f6627..028556c2 100644
--- a/src/Library/Settings.php
+++ b/src/Library/Settings.php
@@ -23,6 +23,7 @@ final class Settings
         'Y-m-d\\TH:i:sP', // RFC 3339
         'Y-m-d\\TH:i:s.uP', // RFC 3339 with microseconds
         'U', // Unix Timestamp
+        'U.u', // Unix Timestamp with microseconds
     ];
 
     /** @var array<class-string|interface-string, callable> */
diff --git a/src/Mapper/Object/DateTimeFormatConstructor.php b/src/Mapper/Object/DateTimeFormatConstructor.php
index 98298f22..a9df7758 100644
--- a/src/Mapper/Object/DateTimeFormatConstructor.php
+++ b/src/Mapper/Object/DateTimeFormatConstructor.php
@@ -44,10 +44,10 @@ public function __construct(string $format, string ...$formats)
 
     /**
      * @param class-string<DateTime|DateTimeImmutable> $className
-     * @param non-empty-string|int $value
+     * @param non-empty-string|int|float $value
      */
     #[DynamicConstructor]
-    public function __invoke(string $className, string|int $value): DateTimeInterface
+    public function __invoke(string $className, string|int|float $value): DateTimeInterface
     {
         foreach ($this->formats as $format) {
             $date = $className::createFromFormat($format, (string)$value) ?: null;
diff --git a/tests/Integration/Mapping/Object/DateTimeMappingTest.php b/tests/Integration/Mapping/Object/DateTimeMappingTest.php
index 99d7113f..4c454864 100644
--- a/tests/Integration/Mapping/Object/DateTimeMappingTest.php
+++ b/tests/Integration/Mapping/Object/DateTimeMappingTest.php
@@ -79,6 +79,19 @@ public function test_default_date_constructor_with_valid_timestamp_format_source
         self::assertSame('1659688380', $result->format('U'));
     }
 
+    public function test_default_date_constructor_with_valid_timestamp_with_microseconds_format_source_returns_datetime(): void
+    {
+        try {
+            $result = $this->mapperBuilder()
+                ->mapper()
+                ->map(DateTimeInterface::class, 1659688380.654000);
+        } catch (MappingError $error) {
+            $this->mappingFail($error);
+        }
+
+        self::assertSame('1659688380.654000', $result->format('U.u'));
+    }
+
     public function test_default_date_constructor_with_timestamp_at_0_source_returns_datetime(): void
     {
         try {
@@ -129,7 +142,7 @@ public function test_default_date_constructor_with_invalid_source_throws_excepti
             $error = $exception->node()->messages()[0];
 
             self::assertSame('1630686564', $error->code());
-            self::assertSame("Value 'invalid datetime' does not match any of the following formats: `Y-m-d\TH:i:sP`, `Y-m-d\TH:i:s.uP`, `U`.", (string)$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`, `U.u`.", (string)$error);
         }
     }
 
diff --git a/tests/Unit/MapperBuilderTest.php b/tests/Unit/MapperBuilderTest.php
index a47e4a5b..0f97a690 100644
--- a/tests/Unit/MapperBuilderTest.php
+++ b/tests/Unit/MapperBuilderTest.php
@@ -56,7 +56,7 @@ 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(['Y-m-d\\TH:i:sP', 'Y-m-d\\TH:i:s.uP', 'U'], $this->mapperBuilder->supportedDateFormats());
+        self::assertSame(['Y-m-d\\TH:i:sP', 'Y-m-d\\TH:i:s.uP', 'U', 'U.u'], $this->mapperBuilder->supportedDateFormats());
     }
 
     public function test_get_supported_date_formats_returns_configured_values(): void