diff --git a/src/DataConverter/JsonConverter.php b/src/DataConverter/JsonConverter.php
index 8f422e4d..a7d447d7 100644
--- a/src/DataConverter/JsonConverter.php
+++ b/src/DataConverter/JsonConverter.php
@@ -56,6 +56,7 @@ public function toPayload($value): ?Payload
             $value = match (true) {
                 $value instanceof \stdClass => $value,
                 $value instanceof UuidInterface => $value->toString(),
+                $value instanceof \DateTimeInterface => $value->format(\DateTimeInterface::RFC3339),
                 default => $this->marshaller->marshal($value),
             };
         }
@@ -133,6 +134,11 @@ public function fromPayload(Payload $payload, Type $type)
                 }
 
                 return Uuid::fromString($data);
+
+            case \DateTimeImmutable::class:
+            case \DateTimeInterface::class:
+                \is_string($data) or throw $this->errorInvalidType($type, $data);
+                return new \DateTimeImmutable($data);
             case Type::TYPE_OBJECT:
                 if (!\is_object($data)) {
                     throw $this->errorInvalidType($type, $data);
diff --git a/tests/Acceptance/App/Runtime/TemporalStarter.php b/tests/Acceptance/App/Runtime/TemporalStarter.php
index 8ce4749f..3f61fe13 100644
--- a/tests/Acceptance/App/Runtime/TemporalStarter.php
+++ b/tests/Acceptance/App/Runtime/TemporalStarter.php
@@ -26,10 +26,13 @@ public function start(): void
         $this->environment->startTemporalServer(parameters: [
             '--search-attribute', 'foo=text',
             '--search-attribute', 'bar=int',
+            '--search-attribute', 'testBool=bool',
             '--search-attribute', 'testInt=int',
             '--search-attribute', 'testFloat=double',
             '--search-attribute', 'testString=text',
             '--search-attribute', 'testKeyword=keyword',
+            '--search-attribute', 'testKeywordList=keywordList',
+            '--search-attribute', 'testDatetime=datetime',
         ]);
         $this->started = true;
     }
diff --git a/tests/Acceptance/Extra/Workflow/TypedSearchAttributesTest.php b/tests/Acceptance/Extra/Workflow/TypedSearchAttributesTest.php
index 9ea677a7..7b879b37 100644
--- a/tests/Acceptance/Extra/Workflow/TypedSearchAttributesTest.php
+++ b/tests/Acceptance/Extra/Workflow/TypedSearchAttributesTest.php
@@ -31,6 +31,15 @@ public function testStartWithTypedSearchAttributes(
                 ->withTypedSearchAttributes(
                     TypedSearchAttributes::empty()
                         ->withValue(SearchAttributeKey::forFloat('testFloat'), 1.1)
+                        ->withValue(SearchAttributeKey::forInteger('testInt'), -2)
+                        ->withValue(SearchAttributeKey::forBool('testBool'), false)
+                        ->withValue(SearchAttributeKey::forString('testString'), 'foo')
+                        ->withValue(SearchAttributeKey::forKeyword('testKeyword'), 'bar')
+                        ->withValue(SearchAttributeKey::forKeywordList('testKeywordList'), ['baz'])
+                        ->withValue(
+                            SearchAttributeKey::forDatetime('testDatetime'),
+                            new \DateTimeImmutable('2019-01-01T00:00:00Z'),
+                        )
                 ),
         );
 
@@ -42,7 +51,16 @@ public function testStartWithTypedSearchAttributes(
         $stub->signal('exit');
         $result = $stub->getResult();
 
-        $this->assertSame(['testFloat' => 1.1], (array)$result);
+        $this->assertEquals([
+            'testBool' => false,
+            'testInt' => -2,
+            'testFloat' => 1.1,
+            'testString' => 'foo',
+            'testKeyword' => 'bar',
+            'testKeywordList' => ['baz'],
+            'testDatetime' => (new \DateTimeImmutable('2019-01-01T00:00:00Z'))
+                ->format(\DateTimeInterface::RFC3339),
+        ], (array)$result);
     }
 
     #[Test]
@@ -54,11 +72,26 @@ public function testUpsertTypedSearchAttributes(
             'Extra_Workflow_TypedSearchAttributes',
             WorkflowOptions::new()
                 ->withTaskQueue($feature->taskQueue)
-                ->withSearchAttributes(['testFloat' => 1.1])
+                ->withSearchAttributes([
+                    'testBool' => false,
+                    'testInt' => -2,
+                    'testFloat' => 1.1,
+                    'testString' => 'foo',
+                    'testKeyword' => 'bar',
+                    'testKeywordList' => ['baz'],
+                    'testDatetime' => (new \DateTimeImmutable('2019-01-01T00:00:00Z'))
+                        ->format(\DateTimeInterface::RFC3339),
+                ])
         );
 
         $toSend = [
+            'testBool' => true,
+            'testInt' => 42,
             'testFloat' => 3.25,
+            'testString' => 'foo bar baz',
+            'testKeyword' => 'foo-bar-baz',
+            'testKeywordList' => ['foo', 'bar', 'baz'],
+            'testDatetime' => (new \DateTimeImmutable('2021-01-01T00:00:00Z'))->format(\DateTimeInterface::RFC3339),
         ];
 
         /** @see TestWorkflow::handle() */