diff --git a/README.md b/README.md
index aacb82d..6548b2d 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ $event = new CloudEvent(
     source: 'https://example.com/user-service',
     id: uniqid(),
     subject: 'user-123',
-    time: date('c'),
+    time: CloudEvent::now(),
     datacontenttype: 'application/json',
     data: [
         'userId' => '123',
@@ -51,6 +51,8 @@ $event = new CloudEvent(
 
 When using the constructor, only `type`, `source` and `id` are required. All other attributes are optional. Arrays passed to `CloudEvent::fromArray()` must also carry an explicit `specversion`.
 
+`CloudEvent::now()` returns the current time as an RFC 3339 UTC timestamp with millisecond precision (e.g., `2025-11-07T10:00:00.123Z`), ready to use as the `time` attribute.
+
 ### Converting to Array
 
 ```php
diff --git a/src/CloudEvents/CloudEvent.php b/src/CloudEvents/CloudEvent.php
index 0250d56..71bd6b5 100644
--- a/src/CloudEvents/CloudEvent.php
+++ b/src/CloudEvents/CloudEvent.php
@@ -2,6 +2,8 @@
 
 namespace Utopia\CloudEvents;
 
+use DateTimeImmutable;
+use DateTimeZone;
 use InvalidArgumentException;
 use JsonException;
 
@@ -11,6 +13,14 @@
  */
 class CloudEvent
 {
+    /**
+     * RFC 3339 (UTC, millisecond precision) format string.
+     *
+     * PHP's DATE_ATOM renders UTC as "+00:00" and carries no sub-second
+     * part, so it is not used here.
+     */
+    public const TIME_FORMAT = 'Y-m-d\TH:i:s.v\Z';
+
     /**
      * Names reserved for core context attributes, which extension
      * attributes must not use.
@@ -55,6 +65,19 @@ public function __construct(
     ) {
     }
 
+    /**
+     * Current time as an RFC 3339 UTC timestamp with milliseconds
+     *
+     * Produces e.g. "2025-11-07T10:00:00.123Z", which is what the time
+     * attribute expects.
+     *
+     * @return string
+     */
+    public static function now(): string
+    {
+        return (new DateTimeImmutable('now', new DateTimeZone('UTC')))->format(self::TIME_FORMAT);
+    }
+
     /**
      * Create CloudEvent from array
      *
diff --git a/tests/CloudEvents/CloudEventTest.php b/tests/CloudEvents/CloudEventTest.php
index 1cde457..cb56aeb 100644
--- a/tests/CloudEvents/CloudEventTest.php
+++ b/tests/CloudEvents/CloudEventTest.php
@@ -431,6 +431,25 @@ public function testValidateWithoutTime(): void
         $this->assertTrue($event->validate());
     }
 
+    public function testNow(): void
+    {
+        $time = CloudEvent::now();
+
+        $this->assertMatchesRegularExpression('/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$/', $time);
+    }
+
+    public function testNowIsValidEventTime(): void
+    {
+        $event = new CloudEvent(
+            type: 'test.event',
+            source: 'test-service',
+            id: 'test-id',
+            time: CloudEvent::now()
+        );
+
+        $this->assertTrue($event->validate());
+    }
+
     public function testExtensions(): void
     {
         $event = new CloudEvent(