diff --git a/system/Cookie/CookieInterface.php b/system/Cookie/CookieInterface.php
index c848fa8884ec..8317617088cd 100644
--- a/system/Cookie/CookieInterface.php
+++ b/system/Cookie/CookieInterface.php
@@ -57,7 +57,7 @@ interface CookieInterface
      * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Date
      * @see https://tools.ietf.org/html/rfc7231#section-7.1.1.2
      */
-    public const EXPIRES_FORMAT = 'D, d-M-Y H:i:s T';
+    public const EXPIRES_FORMAT = DATE_RFC7231;
 
     /**
      * Returns a unique identifier for the cookie consisting
diff --git a/tests/system/Cookie/CookieTest.php b/tests/system/Cookie/CookieTest.php
index e4421a8bc443..1438cfb9d513 100644
--- a/tests/system/Cookie/CookieTest.php
+++ b/tests/system/Cookie/CookieTest.php
@@ -155,14 +155,14 @@ public function testExpirationTime(): void
         // expires => 0
         $cookie = new Cookie('test', 'value');
         $this->assertSame(0, $cookie->getExpiresTimestamp());
-        $this->assertSame('Thu, 01-Jan-1970 00:00:00 GMT', $cookie->getExpiresString());
+        $this->assertSame('Thu, 01 Jan 1970 00:00:00 GMT', $cookie->getExpiresString());
         $this->assertTrue($cookie->isExpired());
         $this->assertSame(0, $cookie->getMaxAge());
 
         $date   = new DateTimeImmutable('2021-01-10 00:00:00 GMT', new DateTimeZone('UTC'));
         $cookie = new Cookie('test', 'value', ['expires' => $date]);
         $this->assertSame((int) $date->format('U'), $cookie->getExpiresTimestamp());
-        $this->assertSame('Sun, 10-Jan-2021 00:00:00 GMT', $cookie->getExpiresString());
+        $this->assertSame('Sun, 10 Jan 2021 00:00:00 GMT', $cookie->getExpiresString());
     }
 
     /**
@@ -272,7 +272,7 @@ public function testStringCastingOfCookies(): void
             $a->toHeaderString(),
         );
         $this->assertSame(
-            "cookie=monster; Expires=Sun, 14-Feb-2021 00:00:00 GMT; Max-Age={$max}; Path=/web; Domain=localhost; HttpOnly; SameSite=Lax",
+            "cookie=monster; Expires=Sun, 14 Feb 2021 00:00:00 GMT; Max-Age={$max}; Path=/web; Domain=localhost; HttpOnly; SameSite=Lax",
             (string) $b,
         );
         $this->assertSame(
@@ -280,7 +280,7 @@ public function testStringCastingOfCookies(): void
             (string) $c,
         );
         $this->assertSame(
-            'cookie=deleted; Expires=Thu, 01-Jan-1970 00:00:00 GMT; Max-Age=0; Path=/; HttpOnly; SameSite=Lax',
+            'cookie=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT; Max-Age=0; Path=/; HttpOnly; SameSite=Lax',
             (string) $d,
         );
 
diff --git a/user_guide_src/source/changelogs/v4.7.0.rst b/user_guide_src/source/changelogs/v4.7.0.rst
index 7645847c59e9..a64f4245de05 100644
--- a/user_guide_src/source/changelogs/v4.7.0.rst
+++ b/user_guide_src/source/changelogs/v4.7.0.rst
@@ -83,6 +83,8 @@ Message Changes
 Changes
 *******
 
+- **Cookie:** The ``CookieInterface::EXPIRES_FORMAT`` has been changed to ``D, d M Y H:i:s \G\M\T`` to follow the recommended format in RFC 7231.
+
 ************
 Deprecations
 ************
diff --git a/user_guide_src/source/libraries/cookies/004.php b/user_guide_src/source/libraries/cookies/004.php
index e39854766db1..d68d97081713 100644
--- a/user_guide_src/source/libraries/cookies/004.php
+++ b/user_guide_src/source/libraries/cookies/004.php
@@ -23,7 +23,7 @@
 $cookie->getPrefix();           // '__Secure-'
 $cookie->getPrefixedName();     // '__Secure-remember_token'
 $cookie->getExpiresTimestamp(); // UNIX timestamp
-$cookie->getExpiresString();    // 'Fri, 14-Feb-2025 00:00:00 GMT'
+$cookie->getExpiresString();    // 'Fri, 14 Feb 2025 00:00:00 GMT'
 $cookie->isExpired();           // false
 $cookie->getMaxAge();           // the difference from time() to expires
 $cookie->isRaw();               // false