diff --git a/homeassistant/helpers/area_registry.py b/homeassistant/helpers/area_registry.py
index bf6dd0d6fcb..3e101f185ed 100644
--- a/homeassistant/helpers/area_registry.py
+++ b/homeassistant/helpers/area_registry.py
@@ -133,10 +133,9 @@ class AreaRegistryStore(Store[AreasRegistryStoreData]):
 
             if old_minor_version < 7:
                 # Version 1.7 adds created_at and modiefied_at
+                created_at = utc_from_timestamp(0).isoformat()
                 for area in old_data["areas"]:
-                    area["created_at"] = area["modified_at"] = utc_from_timestamp(
-                        0
-                    ).isoformat()
+                    area["created_at"] = area["modified_at"] = created_at
 
         if old_major_version > 1:
             raise NotImplementedError
diff --git a/homeassistant/helpers/floor_registry.py b/homeassistant/helpers/floor_registry.py
index 257da3dc47e..f14edef293a 100644
--- a/homeassistant/helpers/floor_registry.py
+++ b/homeassistant/helpers/floor_registry.py
@@ -87,10 +87,9 @@ class FloorRegistryStore(Store[FloorRegistryStoreData]):
         if old_major_version == 1:
             if old_minor_version < 2:
                 # Version 1.2 implements migration and adds created_at and modified_at
+                created_at = utc_from_timestamp(0).isoformat()
                 for floor in old_data["floors"]:
-                    floor["created_at"] = floor["modified_at"] = utc_from_timestamp(
-                        0
-                    ).isoformat()
+                    floor["created_at"] = floor["modified_at"] = created_at
 
         return old_data  # type: ignore[return-value]
 
diff --git a/homeassistant/helpers/label_registry.py b/homeassistant/helpers/label_registry.py
index ab6fdc847fa..1007b17bc5d 100644
--- a/homeassistant/helpers/label_registry.py
+++ b/homeassistant/helpers/label_registry.py
@@ -87,10 +87,9 @@ class LabelRegistryStore(Store[LabelRegistryStoreData]):
         if old_major_version == 1:
             if old_minor_version < 2:
                 # Version 1.2 implements migration and adds created_at and modified_at
+                created_at = utc_from_timestamp(0).isoformat()
                 for label in old_data["labels"]:
-                    label["created_at"] = label["modified_at"] = utc_from_timestamp(
-                        0
-                    ).isoformat()
+                    label["created_at"] = label["modified_at"] = created_at
 
         return old_data  # type: ignore[return-value]