diff --git a/demo/src/stubs/config_entries.ts b/demo/src/stubs/config_entries.ts
index f81e11bc39..ddcdc1e43a 100644
--- a/demo/src/stubs/config_entries.ts
+++ b/demo/src/stubs/config_entries.ts
@@ -1,7 +1,7 @@
 import { MockHomeAssistant } from "../../../src/fake_data/provide_hass";
 
 export const mockConfigEntries = (hass: MockHomeAssistant) => {
-  hass.mockWS("config_entries/get", () => [
+  hass.mockWS("config_entries/get_matching", () => [
     {
       entry_id: "co2signal",
       domain: "co2signal",
diff --git a/src/components/ha-form/compute-initial-ha-form-data.ts b/src/components/ha-form/compute-initial-ha-form-data.ts
index ebcec7414d..d297f3286a 100644
--- a/src/components/ha-form/compute-initial-ha-form-data.ts
+++ b/src/components/ha-form/compute-initial-ha-form-data.ts
@@ -71,7 +71,7 @@ export const computeInitialHaFormData = (
         data[field.name] = "00:00:00";
       } else if ("date" in selector || "datetime" in selector) {
         const now = new Date().toISOString().slice(0, 10);
-        data[field.name] = `${now} 00:00:00`;
+        data[field.name] = `${now}T00:00:00`;
       } else if ("color_rgb" in selector) {
         data[field.name] = [0, 0, 0];
       } else if ("color_temp" in selector) {