diff --git a/core/src/components/datetime/datetime.tsx b/core/src/components/datetime/datetime.tsx
index 9154c24e60..fcdb8bcabe 100644
--- a/core/src/components/datetime/datetime.tsx
+++ b/core/src/components/datetime/datetime.tsx
@@ -1984,7 +1984,7 @@ export class Datetime implements ComponentInterface {
           });
 
           this.setActiveParts({
-            ...activePart,
+            ...this.getActivePartsWithFallback(),
             hour: ev.detail.value,
           });
 
@@ -2024,7 +2024,7 @@ export class Datetime implements ComponentInterface {
           });
 
           this.setActiveParts({
-            ...activePart,
+            ...this.getActivePartsWithFallback(),
             minute: ev.detail.value,
           });
 
@@ -2070,7 +2070,7 @@ export class Datetime implements ComponentInterface {
           });
 
           this.setActiveParts({
-            ...activePart,
+            ...this.getActivePartsWithFallback(),
             ampm: ev.detail.value,
             hour,
           });