diff --git a/api_docs/changelog.md b/api_docs/changelog.md
index 5fc916383a..676e62d7dd 100644
--- a/api_docs/changelog.md
+++ b/api_docs/changelog.md
@@ -20,6 +20,11 @@ format used by the Zulip server that they are interacting with.
 
 ## Changes in Zulip 8.0
 
+**Feature level 203**
+
+* [`POST /register`](/api/register-queue): Add
+  `realm_date_created` field to realm data.
+
 **Feature level 202**
 
 * [`PATCH /realm/linkifiers`](/api/reorder-linkifiers): Added new endpoint
diff --git a/web/src/navbar_alerts.js b/web/src/navbar_alerts.js
index 4aa9e088a4..c292f39ed7 100644
--- a/web/src/navbar_alerts.js
+++ b/web/src/navbar_alerts.js
@@ -15,6 +15,7 @@ import * as keydown_util from "./keydown_util";
 import {localstorage} from "./localstorage";
 import * as notifications from "./notifications";
 import {page_params} from "./page_params";
+import {should_display_profile_incomplete_alert} from "./timerender";
 import * as unread from "./unread";
 import * as unread_ops from "./unread_ops";
 import * as unread_ui from "./unread_ui";
@@ -96,6 +97,9 @@ export function check_profile_incomplete() {
     if (!page_params.is_admin) {
         return false;
     }
+    if (!should_display_profile_incomplete_alert(page_params.realm_date_created)) {
+        return false;
+    }
 
     // Eventually, we might also check page_params.realm_icon_source,
     // but it feels too aggressive to ask users to do change that
diff --git a/web/src/timerender.ts b/web/src/timerender.ts
index 1edde3402e..c8d2569b6c 100644
--- a/web/src/timerender.ts
+++ b/web/src/timerender.ts
@@ -490,3 +490,14 @@ export function get_time_limit_setting_in_appropriate_unit(
     const time_limit_in_days = Math.floor(time_limit_in_hours / 24);
     return {value: time_limit_in_days, unit: "day"};
 }
+
+export function should_display_profile_incomplete_alert(timestamp: number): boolean {
+    const today = new Date(Date.now());
+    const time = new Date(timestamp);
+    const days_old = differenceInCalendarDays(today, time);
+
+    if (days_old >= 15) {
+        return true;
+    }
+    return false;
+}
diff --git a/web/tests/navbar_alerts.test.js b/web/tests/navbar_alerts.test.js
index 4aebaa7e8e..5d3c52379c 100644
--- a/web/tests/navbar_alerts.test.js
+++ b/web/tests/navbar_alerts.test.js
@@ -12,6 +12,7 @@ page_params.is_spectator = false;
 
 const notifications = mock_esm("../src/notifications");
 const util = mock_esm("../src/util");
+const timerender = mock_esm("../src/timerender");
 
 const {localstorage} = zrequire("localstorage");
 const navbar_alerts = zrequire("navbar_alerts");
@@ -62,7 +63,10 @@ test("allow_notification_alert", ({disallow, override}) => {
     assert.equal(navbar_alerts.should_show_notifications(ls), false);
 });
 
-test("profile_incomplete_alert", () => {
+test("profile_incomplete_alert", ({override}) => {
+    // Don't test time related conditions
+    override(timerender, "should_display_profile_incomplete_alert", () => true);
+
     // Show alert.
     page_params.is_admin = true;
     page_params.realm_description = "Organization imported from Slack!";
diff --git a/web/tests/timerender.test.js b/web/tests/timerender.test.js
index 809f08a7de..3eed481ac5 100644
--- a/web/tests/timerender.test.js
+++ b/web/tests/timerender.test.js
@@ -597,3 +597,17 @@ run_test("set_full_datetime", () => {
     expected = "10:52 AM";
     assert.equal(time_str, expected);
 });
+
+run_test("should_display_profile_incomplete_alert", () => {
+    // Organization created < 15 days ago
+    let realm_date_created = new Date();
+    realm_date_created.setDate(realm_date_created.getDate() - 5);
+
+    assert.equal(timerender.should_display_profile_incomplete_alert(realm_date_created), false);
+
+    // Organization created > 15 days ago
+    realm_date_created = new Date();
+    realm_date_created.setDate(realm_date_created.getDate() - 15);
+
+    assert.equal(timerender.should_display_profile_incomplete_alert(realm_date_created), true);
+});
diff --git a/zerver/lib/events.py b/zerver/lib/events.py
index 8020d6c9ef..27a5888744 100644
--- a/zerver/lib/events.py
+++ b/zerver/lib/events.py
@@ -359,6 +359,7 @@ def fetch_initial_state_data(
             state["demo_organization_scheduled_deletion_date"] = datetime_to_timestamp(
                 realm.demo_organization_scheduled_deletion_date
             )
+        state["realm_date_created"] = datetime_to_timestamp(realm.date_created)
 
         # Presence system parameters for client behavior.
         state["server_presence_ping_interval_seconds"] = settings.PRESENCE_PING_INTERVAL_SECS
diff --git a/zerver/openapi/zulip.yaml b/zerver/openapi/zulip.yaml
index 8121958f08..3165f2e8db 100644
--- a/zerver/openapi/zulip.yaml
+++ b/zerver/openapi/zulip.yaml
@@ -11195,6 +11195,13 @@ paths:
                               type: string
                               description: |
                                 The name of the custom profile field type.
+                      realm_date_created:
+                        type: integer
+                        description: |
+                          The UNIX timestamp (UTC) for when the organization was
+                          created.
+
+                          **Changes**: New in Zulip 8.0 (feature level 203).
                       demo_organization_scheduled_deletion_date:
                         type: integer
                         description: |
diff --git a/zerver/tests/test_home.py b/zerver/tests/test_home.py
index 98dcea61d7..b1521e194e 100644
--- a/zerver/tests/test_home.py
+++ b/zerver/tests/test_home.py
@@ -118,6 +118,7 @@ class HomeTest(ZulipTestCase):
         "realm_create_private_stream_policy",
         "realm_create_public_stream_policy",
         "realm_create_web_public_stream_policy",
+        "realm_date_created",
         "realm_default_code_block_language",
         "realm_default_external_accounts",
         "realm_default_language",