Catch error if input_datetime state is incorrect (#10237)

src/common/entity/compute_state_display.ts

@@ -39,7 +39,7 @@ export const computeStateDisplay = (
   const domain = computeStateDomain(stateObj);
 
   if (domain === "input_datetime") {
-    if (state) {
+    if (state !== undefined) {
       // If trying to display an explicit state, need to parse the explict state to `Date` then format.
       // Attributes aren't available, we have to use `state`.
       try {
@@ -63,7 +63,7 @@ export const computeStateDisplay = (
           }
         }
         return state;
-      } catch {
+      } catch (_e) {
         // Formatting methods may throw error if date parsing doesn't go well,
         // just return the state string in that case.
         return state;
@@ -71,7 +71,17 @@ export const computeStateDisplay = (
     } else {
       // If not trying to display an explicit state, create `Date` object from `stateObj`'s attributes then format.
       let date: Date;
-      if (!stateObj.attributes.has_time) {
+      if (stateObj.attributes.has_date && stateObj.attributes.has_time) {
+        date = new Date(
+          stateObj.attributes.year,
+          stateObj.attributes.month - 1,
+          stateObj.attributes.day,
+          stateObj.attributes.hour,
+          stateObj.attributes.minute
+        );
+        return formatDateTime(date, locale);
+      }
+      if (stateObj.attributes.has_date) {
         date = new Date(
           stateObj.attributes.year,
           stateObj.attributes.month - 1,
@@ -79,20 +89,12 @@ export const computeStateDisplay = (
         );
         return formatDate(date, locale);
       }
-      if (!stateObj.attributes.has_date) {
+      if (stateObj.attributes.has_time) {
         date = new Date();
         date.setHours(stateObj.attributes.hour, stateObj.attributes.minute);
         return formatTime(date, locale);
       }
-
-      date = new Date(
-        stateObj.attributes.year,
-        stateObj.attributes.month - 1,
-        stateObj.attributes.day,
-        stateObj.attributes.hour,
-        stateObj.attributes.minute
-      );
-      return formatDateTime(date, locale);
+      return stateObj.state;
     }
   }