diff --git a/web/src/compose.js b/web/src/compose.js
index 486557ff61..c1a166446f 100644
--- a/web/src/compose.js
+++ b/web/src/compose.js
@@ -804,14 +804,35 @@ export function reset_compose_scheduling_state(reset_edit_state = true) {
 }
 
 function schedule_message_to_custom_date() {
-    const request = create_message_object();
-    const selected_send_later_time = popover_menus.get_selected_send_later_time();
-    request.content = `/schedule ${selected_send_later_time}\n` + request.content;
-    // If this is an edit request `scheduled_message_id` will be defined.
-    let scheduled_message_id;
-    if ($("#compose-textarea").attr("data-scheduled-message-id")) {
-        scheduled_message_id = $("#compose-textarea").attr("data-scheduled-message-id");
-        $("#compose-textarea").removeAttr("data-scheduled-message-id");
+    const compose_message_object = create_message_object();
+
+    const deliver_at = popover_menus.get_formatted_selected_send_later_time();
+    const send_later_time = popover_menus.get_selected_send_later_time();
+    const scheduled_delivery_timestamp = Math.floor(Date.parse(send_later_time) / 1000);
+
+    const message_type = compose_message_object.type;
+    let req_type;
+
+    if (message_type === "private") {
+        req_type = "direct";
+    } else {
+        req_type = message_type;
     }
-    reminder.schedule_message(request, clear_compose_box, scheduled_message_id);
+
+    const scheduled_message_data = {
+        type: req_type,
+        to: JSON.stringify(compose_message_object.to),
+        topic: compose_message_object.topic,
+        content: compose_message_object.content,
+        scheduled_delivery_timestamp,
+    };
+
+    // If this is an edit request `scheduled_message_id` will be defined.
+    if ($("#compose-textarea").attr("data-scheduled-message-id")) {
+        scheduled_message_data.scheduled_message_id = $("#compose-textarea").attr(
+            "data-scheduled-message-id",
+        );
+    }
+
+    scheduled_messages.send_request_to_schedule_message(scheduled_message_data, deliver_at);
 }
diff --git a/web/src/popover_menus.js b/web/src/popover_menus.js
index 1c5386740c..68ca6bc47a 100644
--- a/web/src/popover_menus.js
+++ b/web/src/popover_menus.js
@@ -82,6 +82,13 @@ export function is_time_selected_for_schedule() {
 }
 
 export function get_selected_send_later_time() {
+    if (!selected_send_later_time) {
+        return undefined;
+    }
+    return selected_send_later_time;
+}
+
+export function get_formatted_selected_send_later_time() {
     if (!selected_send_later_time) {
         return undefined;
     }
@@ -863,7 +870,7 @@ export function initialize() {
                 possible_send_later_today = false;
             }
 
-            const formatted_send_later_time = get_selected_send_later_time();
+            const formatted_send_later_time = get_formatted_selected_send_later_time();
 
             instance.setContent(
                 parse_html(
diff --git a/web/src/scheduled_messages.js b/web/src/scheduled_messages.js
index f4ba532bed..05293cb99f 100644
--- a/web/src/scheduled_messages.js
+++ b/web/src/scheduled_messages.js
@@ -3,9 +3,12 @@ import $ from "jquery";
 import * as channel from "./channel";
 import * as compose from "./compose";
 import * as compose_actions from "./compose_actions";
+import * as compose_banner from "./compose_banner";
 import * as compose_fade from "./compose_fade";
 import * as compose_ui from "./compose_ui";
+import {$t} from "./i18n";
 import * as narrow from "./narrow";
+import * as notifications from "./notifications";
 import * as overlays from "./overlays";
 import * as people from "./people";
 import * as popover_menus from "./popover_menus";
@@ -68,6 +71,36 @@ export function edit_scheduled_message(scheduled_msg_id) {
     popover_menus.show_schedule_confirm_button(scheduled_msg.formatted_send_at_time, true);
 }
 
+export function send_request_to_schedule_message(scheduled_message_data, deliver_at) {
+    const success = function () {
+        compose.clear_compose_box();
+        notifications.notify_above_composebox(
+            $t({defaultMessage: `Your message has been scheduled for {deliver_at}.`}, {deliver_at}),
+            "scheduled_message_banner",
+            "/#scheduled",
+            "",
+            $t({defaultMessage: "View scheduled messages"}),
+        );
+    };
+
+    const error = function (xhr) {
+        const response = channel.xhr_error_message("Error sending message", xhr);
+        compose_ui.hide_compose_spinner();
+        compose_banner.show_error_message(
+            response,
+            compose_banner.CLASSNAMES.generic_compose_error,
+            $("#compose-textarea"),
+        );
+    };
+
+    channel.post({
+        url: "/json/scheduled_messages",
+        data: scheduled_message_data,
+        success,
+        error,
+    });
+}
+
 export function delete_scheduled_message(scheduled_msg_id) {
     channel.del({
         url: "/json/scheduled_messages/" + scheduled_msg_id,
diff --git a/web/src/scheduled_messages_overlay_ui.js b/web/src/scheduled_messages_overlay_ui.js
index ccb386f841..1f666bcddc 100644
--- a/web/src/scheduled_messages_overlay_ui.js
+++ b/web/src/scheduled_messages_overlay_ui.js
@@ -38,7 +38,7 @@ function format(scheduled_messages) {
             msg_render_context.is_stream = false;
             msg_render_context.recipients = people.get_recipients(msg.to.join(","));
         }
-        const time = new Date(msg.deliver_at);
+        const time = new Date(msg.scheduled_delivery_timestamp * 1000);
         msg_render_context.full_date_time = timerender.get_full_datetime(time);
         msg_render_context.formatted_send_at_time = date_fns.format(time, "MMM d yyyy h:mm a");
         formatted_msgs.push(msg_render_context);
diff --git a/web/src/tippyjs.js b/web/src/tippyjs.js
index 1facc181b7..831a6215ec 100644
--- a/web/src/tippyjs.js
+++ b/web/src/tippyjs.js
@@ -654,7 +654,7 @@ export function initialize() {
                 return false;
             }
 
-            const send_at_time = popover_menus.get_selected_send_later_time();
+            const send_at_time = popover_menus.get_formatted_selected_send_later_time();
             instance.setContent(
                 parse_html(
                     $t(