diff --git a/modules/store-devtools/spec/extension.spec.ts b/modules/store-devtools/spec/extension.spec.ts
index c59bf3a880..979720e6f2 100644
--- a/modules/store-devtools/spec/extension.spec.ts
+++ b/modules/store-devtools/spec/extension.spec.ts
@@ -170,7 +170,7 @@ describe('DevtoolsExtension', () => {
       const SANITIZED_COUNTER = 42;
 
       function createPerformAction() {
-        return new PerformAction({ type: UNSANITIZED_TOKEN });
+        return new PerformAction({ type: UNSANITIZED_TOKEN }, +Date.now());
       }
 
       function testActionSanitizer(action: Action, id: number) {
diff --git a/modules/store-devtools/src/actions.ts b/modules/store-devtools/src/actions.ts
index ce0cd1aaa9..a52683e6e0 100644
--- a/modules/store-devtools/src/actions.ts
+++ b/modules/store-devtools/src/actions.ts
@@ -14,7 +14,7 @@ export const IMPORT_STATE = 'IMPORT_STATE';
 export class PerformAction implements Action {
   readonly type = PERFORM_ACTION;
 
-  constructor(public action: Action, public timestamp?: number) {
+  constructor(public action: Action, public timestamp: number) {
     if (typeof action.type === 'undefined') {
       throw new Error(
         'Actions may not have an undefined "type" property. ' +
@@ -27,19 +27,19 @@ export class PerformAction implements Action {
 export class Reset implements Action {
   readonly type = RESET;
 
-  constructor(public timestamp?: number) {}
+  constructor(public timestamp: number) {}
 }
 
 export class Rollback implements Action {
   readonly type = ROLLBACK;
 
-  constructor(public timestamp?: number) {}
+  constructor(public timestamp: number) {}
 }
 
 export class Commit implements Action {
   readonly type = COMMIT;
 
-  constructor(public timestamp?: number) {}
+  constructor(public timestamp: number) {}
 }
 
 export class Sweep implements Action {
diff --git a/modules/store-devtools/src/devtools.ts b/modules/store-devtools/src/devtools.ts
index 31ff1fc4f9..f117ea45ae 100644
--- a/modules/store-devtools/src/devtools.ts
+++ b/modules/store-devtools/src/devtools.ts
@@ -119,19 +119,19 @@ export class StoreDevtools implements Observer<any> {
   complete() {}
 
   performAction(action: any) {
-    this.dispatch(new Actions.PerformAction(action));
+    this.dispatch(new Actions.PerformAction(action, +Date.now()));
   }
 
   reset() {
-    this.dispatch(new Actions.Reset());
+    this.dispatch(new Actions.Reset(+Date.now()));
   }
 
   rollback() {
-    this.dispatch(new Actions.Rollback());
+    this.dispatch(new Actions.Rollback(+Date.now()));
   }
 
   commit() {
-    this.dispatch(new Actions.Commit());
+    this.dispatch(new Actions.Commit(+Date.now()));
   }
 
   sweep() {
diff --git a/modules/store-devtools/src/reducer.ts b/modules/store-devtools/src/reducer.ts
index efcdaa1422..9719b6ef22 100644
--- a/modules/store-devtools/src/reducer.ts
+++ b/modules/store-devtools/src/reducer.ts
@@ -392,7 +392,7 @@ export function liftReducerWith(
 
           // Add a new action to only recompute state
           const actionId = nextActionId++;
-          actionsById[actionId] = new PerformAction(liftedAction);
+          actionsById[actionId] = new PerformAction(liftedAction, +Date.now());
           stagedActionIds = [...stagedActionIds, actionId];
 
           minInvalidatedStateIndex = stagedActionIds.length - 1;
diff --git a/modules/store-devtools/src/utils.ts b/modules/store-devtools/src/utils.ts
index 996486ca84..3adf008dfa 100644
--- a/modules/store-devtools/src/utils.ts
+++ b/modules/store-devtools/src/utils.ts
@@ -32,7 +32,7 @@ export function unliftAction(liftedState: LiftedState): LiftedAction {
  * Lifts an app's action into an action on the lifted store.
  */
 export function liftAction(action: Action) {
-  return new Actions.PerformAction(action);
+  return new Actions.PerformAction(action, +Date.now());
 }
 
 /**