diff --git a/Tests/LibWeb/Text/expected/cookie.txt b/Tests/LibWeb/Text/expected/cookie.txt
index 1855397519f..bfd83b6c895 100644
--- a/Tests/LibWeb/Text/expected/cookie.txt
+++ b/Tests/LibWeb/Text/expected/cookie.txt
@@ -16,10 +16,10 @@ SameSite=Lax: "cookie=value"
 SameSite=Strict: "cookie=value"
 SameSite=None: ""
 Max-Age (before expiration): "cookie-max-age1=value; cookie-max-age2=value"
-Expires (before expiration): "cookie-expires=value; cookie-max-age1=value; cookie-max-age2=value"
 Max-Age (after expiration): "cookie-max-age2=value"
-Expires (after expiration): ""
 Max-Age in past: ""
+Expires (before expiration): "cookie-expires=value"
+Expires (after expiration): ""
 Expires in past: ""
 Invalid expiry (date does not exist): "cookie=value"
 Invalid expiry (missing time): "cookie=value"
diff --git a/Tests/LibWeb/Text/input/cookie.html b/Tests/LibWeb/Text/input/cookie.html
index 3835a8642ab..cd439f213d8 100644
--- a/Tests/LibWeb/Text/input/cookie.html
+++ b/Tests/LibWeb/Text/input/cookie.html
@@ -122,13 +122,12 @@
         deleteCookie("cookie");
     };
 
-    const maxAgeTest1 = () => {
+    const maxAgeTest = () => {
         document.cookie = "cookie-max-age1=value; max-age=1";
         document.cookie = `cookie-max-age2=value; max-age=${"1".repeat(1024)}`;
         printCookies("Max-Age (before expiration)");
-    };
 
-    const maxAgeTest2 = () => {
+        internals.expireCookiesWithTimeOffset(2);
         printCookies("Max-Age (after expiration)");
         deleteCookie("cookie-max-age2");
     };
@@ -139,15 +138,14 @@
         printCookies("Max-Age in past");
     };
 
-    const expiresTest1 = () => {
+    const expiresTest = () => {
         let expiry = new Date(Date.now() + 1000);
         expiry = expiry.toUTCString();
 
         document.cookie = `cookie-expires=value; expires=${expiry}`;
         printCookies("Expires (before expiration)");
-    };
 
-    const expiresTest2 = () => {
+        internals.expireCookiesWithTimeOffset(2);
         printCookies("Expires (after expiration)");
     };
 
@@ -179,7 +177,7 @@
         deleteCookie("cookie");
     };
 
-    asyncTest(done => {
+    test(() => {
         basicTest();
         multipleCookiesTest();
 
@@ -200,18 +198,11 @@
         publicSuffixTest();
         sameSiteTest();
 
-        maxAgeTest1();
-        expiresTest1();
+        maxAgeTest();
+        maxAgeInPastTest();
 
-        setTimeout(() => {
-            maxAgeTest2();
-            expiresTest2();
-
-            maxAgeInPastTest();
-            expiresInPastTest();
-            invalidExpiryTest();
-
-            done();
-        }, 1200);
+        expiresTest();
+        expiresInPastTest();
+        invalidExpiryTest();
     });
 </script>
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.cpp b/Userland/Libraries/LibWeb/Internals/Internals.cpp
index a97cd04b7f2..1b0a41956e0 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.cpp
+++ b/Userland/Libraries/LibWeb/Internals/Internals.cpp
@@ -184,4 +184,9 @@ void Internals::simulate_drop(double x, double y)
     page.handle_drag_and_drop_event(DragEvent::Type::Drop, position, position, UIEvents::MouseButton::Primary, 0, 0, {});
 }
 
+void Internals::expire_cookies_with_time_offset(WebIDL::LongLong seconds)
+{
+    internals_page().client().page_did_expire_cookies_with_time_offset(AK::Duration::from_seconds(seconds));
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.h b/Userland/Libraries/LibWeb/Internals/Internals.h
index 2623a5b3759..69336c8d0fd 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.h
+++ b/Userland/Libraries/LibWeb/Internals/Internals.h
@@ -44,6 +44,8 @@ public:
     void simulate_drag_move(double x, double y);
     void simulate_drop(double x, double y);
 
+    void expire_cookies_with_time_offset(WebIDL::LongLong seconds);
+
 private:
     explicit Internals(JS::Realm&);
     virtual void initialize(JS::Realm&) override;
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.idl b/Userland/Libraries/LibWeb/Internals/Internals.idl
index 665b55de9a8..d6b2c14327e 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.idl
+++ b/Userland/Libraries/LibWeb/Internals/Internals.idl
@@ -33,4 +33,6 @@ interface Internals {
     undefined simulateDragStart(double x, double y, DOMString mimeType, DOMString contents);
     undefined simulateDragMove(double x, double y);
     undefined simulateDrop(double x, double y);
+
+    undefined expireCookiesWithTimeOffset(long long seconds);
 };
diff --git a/Userland/Libraries/LibWeb/Page/Page.h b/Userland/Libraries/LibWeb/Page/Page.h
index 6877a072572..3242bbca6cc 100644
--- a/Userland/Libraries/LibWeb/Page/Page.h
+++ b/Userland/Libraries/LibWeb/Page/Page.h
@@ -343,6 +343,7 @@ public:
     virtual String page_did_request_cookie(URL::URL const&, Cookie::Source) { return {}; }
     virtual void page_did_set_cookie(URL::URL const&, Cookie::ParsedCookie const&, Cookie::Source) { }
     virtual void page_did_update_cookie(Web::Cookie::Cookie) { }
+    virtual void page_did_expire_cookies_with_time_offset(AK::Duration) { }
     virtual void page_did_update_resource_count(i32) { }
     struct NewWebViewResult {
         JS::GCPtr<Page> page;
diff --git a/Userland/Libraries/LibWebView/CookieJar.cpp b/Userland/Libraries/LibWebView/CookieJar.cpp
index 5acac7caa39..404110e536d 100644
--- a/Userland/Libraries/LibWebView/CookieJar.cpp
+++ b/Userland/Libraries/LibWebView/CookieJar.cpp
@@ -213,6 +213,11 @@ Optional<Web::Cookie::Cookie> CookieJar::get_named_cookie(URL::URL const& url, S
     return {};
 }
 
+void CookieJar::expire_cookies_with_time_offset(AK::Duration offset)
+{
+    m_transient_storage.purge_expired_cookies(offset);
+}
+
 // https://www.ietf.org/archive/id/draft-ietf-httpbis-rfc6265bis-15.html#section-5.1.2
 Optional<String> CookieJar::canonicalize_domain(const URL::URL& url)
 {
@@ -643,12 +648,19 @@ Optional<Web::Cookie::Cookie> CookieJar::TransientStorage::get_cookie(CookieStor
     return m_cookies.get(key);
 }
 
-UnixDateTime CookieJar::TransientStorage::purge_expired_cookies()
+UnixDateTime CookieJar::TransientStorage::purge_expired_cookies(Optional<AK::Duration> offset)
 {
     auto now = UnixDateTime::now();
-    auto is_expired = [&](auto const&, auto const& cookie) { return cookie.expiry_time < now; };
+    if (offset.has_value()) {
+        now += *offset;
 
+        for (auto& cookie : m_dirty_cookies)
+            cookie.value.expiry_time -= *offset;
+    }
+
+    auto is_expired = [&](auto const&, auto const& cookie) { return cookie.expiry_time < now; };
     m_cookies.remove_all_matching(is_expired);
+
     return now;
 }
 
diff --git a/Userland/Libraries/LibWebView/CookieJar.h b/Userland/Libraries/LibWebView/CookieJar.h
index a8591753819..b7db194d386 100644
--- a/Userland/Libraries/LibWebView/CookieJar.h
+++ b/Userland/Libraries/LibWebView/CookieJar.h
@@ -47,7 +47,7 @@ class CookieJar {
 
         size_t size() const { return m_cookies.size(); }
 
-        UnixDateTime purge_expired_cookies();
+        UnixDateTime purge_expired_cookies(Optional<AK::Duration> offset = {});
 
         auto take_dirty_cookies() { return move(m_dirty_cookies); }
 
@@ -94,6 +94,7 @@ public:
     Vector<Web::Cookie::Cookie> get_all_cookies();
     Vector<Web::Cookie::Cookie> get_all_cookies(URL::URL const& url);
     Optional<Web::Cookie::Cookie> get_named_cookie(URL::URL const& url, StringView name);
+    void expire_cookies_with_time_offset(AK::Duration);
 
 private:
     explicit CookieJar(Optional<PersistedStorage>);
diff --git a/Userland/Libraries/LibWebView/WebContentClient.cpp b/Userland/Libraries/LibWebView/WebContentClient.cpp
index ce6629dc8a0..5e13efc4f73 100644
--- a/Userland/Libraries/LibWebView/WebContentClient.cpp
+++ b/Userland/Libraries/LibWebView/WebContentClient.cpp
@@ -445,6 +445,11 @@ void WebContentClient::did_update_cookie(Web::Cookie::Cookie const& cookie)
     Application::cookie_jar().update_cookie(cookie);
 }
 
+void WebContentClient::did_expire_cookies_with_time_offset(AK::Duration offset)
+{
+    Application::cookie_jar().expire_cookies_with_time_offset(offset);
+}
+
 Messages::WebContentClient::DidRequestNewWebViewResponse WebContentClient::did_request_new_web_view(u64 page_id, Web::HTML::ActivateTab const& activate_tab, Web::HTML::WebViewHints const& hints, Optional<u64> const& page_index)
 {
     if (auto view = view_for_page_id(page_id); view.has_value()) {
diff --git a/Userland/Libraries/LibWebView/WebContentClient.h b/Userland/Libraries/LibWebView/WebContentClient.h
index 57b2297ba4d..4b9d84e2f89 100644
--- a/Userland/Libraries/LibWebView/WebContentClient.h
+++ b/Userland/Libraries/LibWebView/WebContentClient.h
@@ -93,6 +93,7 @@ private:
     virtual Messages::WebContentClient::DidRequestCookieResponse did_request_cookie(URL::URL const&, Web::Cookie::Source) override;
     virtual void did_set_cookie(URL::URL const&, Web::Cookie::ParsedCookie const&, Web::Cookie::Source) override;
     virtual void did_update_cookie(Web::Cookie::Cookie const&) override;
+    virtual void did_expire_cookies_with_time_offset(AK::Duration) override;
     virtual Messages::WebContentClient::DidRequestNewWebViewResponse did_request_new_web_view(u64 page_id, Web::HTML::ActivateTab const&, Web::HTML::WebViewHints const&, Optional<u64> const& page_index) override;
     virtual void did_request_activate_tab(u64 page_id) override;
     virtual void did_close_browsing_context(u64 page_id) override;
diff --git a/Userland/Services/WebContent/PageClient.cpp b/Userland/Services/WebContent/PageClient.cpp
index ff9b135df92..ca2b9fb502d 100644
--- a/Userland/Services/WebContent/PageClient.cpp
+++ b/Userland/Services/WebContent/PageClient.cpp
@@ -502,6 +502,11 @@ void PageClient::page_did_update_cookie(Web::Cookie::Cookie cookie)
     client().async_did_update_cookie(move(cookie));
 }
 
+void PageClient::page_did_expire_cookies_with_time_offset(AK::Duration offset)
+{
+    client().async_did_expire_cookies_with_time_offset(offset);
+}
+
 void PageClient::page_did_update_resource_count(i32 count_waiting)
 {
     client().async_did_update_resource_count(m_id, count_waiting);
diff --git a/Userland/Services/WebContent/PageClient.h b/Userland/Services/WebContent/PageClient.h
index 5f727b42916..2875428d799 100644
--- a/Userland/Services/WebContent/PageClient.h
+++ b/Userland/Services/WebContent/PageClient.h
@@ -146,6 +146,7 @@ private:
     virtual String page_did_request_cookie(URL::URL const&, Web::Cookie::Source) override;
     virtual void page_did_set_cookie(URL::URL const&, Web::Cookie::ParsedCookie const&, Web::Cookie::Source) override;
     virtual void page_did_update_cookie(Web::Cookie::Cookie) override;
+    virtual void page_did_expire_cookies_with_time_offset(AK::Duration) override;
     virtual void page_did_update_resource_count(i32) override;
     virtual NewWebViewResult page_did_request_new_web_view(Web::HTML::ActivateTab, Web::HTML::WebViewHints, Web::HTML::TokenizedFeature::NoOpener) override;
     virtual void page_did_request_activate_tab() override;
diff --git a/Userland/Services/WebContent/WebContentClient.ipc b/Userland/Services/WebContent/WebContentClient.ipc
index a9cb4cef920..94b346ccac1 100644
--- a/Userland/Services/WebContent/WebContentClient.ipc
+++ b/Userland/Services/WebContent/WebContentClient.ipc
@@ -71,6 +71,7 @@ endpoint WebContentClient
     did_request_cookie(URL::URL url, Web::Cookie::Source source) => (String cookie)
     did_set_cookie(URL::URL url, Web::Cookie::ParsedCookie cookie, Web::Cookie::Source source) => ()
     did_update_cookie(Web::Cookie::Cookie cookie) =|
+    did_expire_cookies_with_time_offset(AK::Duration offset) =|
     did_update_resource_count(u64 page_id, i32 count_waiting) =|
     did_request_new_web_view(u64 page_id, Web::HTML::ActivateTab activate_tab, Web::HTML::WebViewHints hints, Optional<u64> page_index) => (String handle)
     did_request_activate_tab(u64 page_id) =|