diff --git a/addons/web/static/src/views/debug_items.js b/addons/web/static/src/views/debug_items.js
index 5acafc76192..7a7afada3a8 100644
--- a/addons/web/static/src/views/debug_items.js
+++ b/addons/web/static/src/views/debug_items.js
@@ -11,6 +11,7 @@ import { formatMany2one } from "@web/views/fields/formatters";
 import { FormViewDialog } from "@web/views/view_dialogs/form_view_dialog";
 
 import { Component, onWillStart, useState, xml } from "@odoo/owl";
+import {serializeDate, serializeDateTime} from "../core/l10n/dates";
 
 const debugRegistry = registry.category("debug");
 
@@ -321,9 +322,15 @@ class SetDefaultDialog extends Component {
         if (!this.state.fieldToSet) {
             return;
         }
-        const fieldToSet = this.defaultFields.find((field) => {
+        let fieldToSet = this.defaultFields.find((field) => {
             return field.name === this.state.fieldToSet;
         }).value;
+
+        if(fieldToSet.constructor.name.toLowerCase() === "date"){
+            fieldToSet = serializeDate(fieldToSet);
+        } else if (fieldToSet.constructor.name.toLowerCase() === "datetime"){
+            fieldToSet = serializeDateTime(fieldToSet);
+        }
         await this.orm.call("ir.default", "set", [
             this.props.record.resModel,
             this.state.fieldToSet,
diff --git a/addons/web/static/tests/core/debug/debug_manager_tests.js b/addons/web/static/tests/core/debug/debug_manager_tests.js
index 761875e7f77..b475c3493c5 100644
--- a/addons/web/static/tests/core/debug/debug_manager_tests.js
+++ b/addons/web/static/tests/core/debug/debug_manager_tests.js
@@ -808,4 +808,80 @@ QUnit.module("DebugMenu", (hooks) => {
             ]
         );
     });
+
+    QUnit.test("set defaults: setting default value for datetime field", async (assert) => {
+        assert.expect(7);
+
+        prepareRegistriesWithCleanup();
+        patchWithCleanup(odoo, {
+            debug: true,
+        });
+
+        registry.category("services").add("user", makeFakeUserService());
+        registry.category("debug").category("form").add("setDefaults", setDefaults);
+
+        const serverData = getActionManagerServerData();
+        serverData.actions[1234] = {
+            id: 1234,
+            xml_id: "action_1234",
+            name: "Partners",
+            res_model: "partner",
+            res_id: 1,
+            type: "ir.actions.act_window",
+            views: [[18, "form"]],
+        };
+        serverData.models.partner.fields.datetime = {string: 'Datetime', type: 'datetime'}
+        serverData.models.partner.fields.reference = {string: 'Reference', type: 'reference', selection: [["pony", "Pony"]]}
+        serverData.views["partner,18,form"] = `
+            <form>
+                <field name="datetime"/>
+                <field name="reference"/>
+                <field name="m2o"/>
+            </form>`;
+        serverData.models["ir.ui.view"] = {
+            fields: {},
+            records: [{ id: 18 }],
+        };
+        serverData.models.pony.records = [{
+            id: 1,
+            name: "Test"
+        }];
+        serverData.models.partner.records = [{
+            id: 1,
+            display_name: "p1",
+            datetime: "2024-01-24 16:46:16",
+            reference: 'pony,1',
+            m2o: 1
+        }];
+
+        const mockRPC = async (route, args) => {
+            if (args.method === "check_access_rights") {
+                return Promise.resolve(true);
+            }
+            if (args.method === "set" && args.model === "ir.default") {
+                arg_steps.push(args.args)
+                return true;
+            }
+        };
+        const webClient = await createWebClient({serverData, mockRPC});
+        let arg_steps = [];
+        for (const field_name of ['datetime', 'reference', 'm2o']) {
+            await doAction(webClient, 1234);
+            await click(target.querySelector(".o_debug_manager button"));
+            await click(target.querySelector(".o_debug_manager .dropdown-item"));
+            assert.containsOnce(target, ".modal");
+
+            const select = target.querySelector(".modal #formview_default_fields");
+            select.value = field_name;
+            select.dispatchEvent(new Event("change"));
+            await nextTick();
+            await click(target.querySelectorAll(".modal .modal-footer button")[1]);
+            assert.containsNone(target, ".modal");
+        }
+        assert.deepEqual(arg_steps, [
+            ["partner", "datetime", "2024-01-24 16:46:16", true, true, false],
+            ["partner", "reference", {"displayName": "Test", "resId": 1, "resModel": "pony"}, true, true, false],
+            ["partner", "m2o", 1, true, true, false],
+        ]);
+    });
 });