diff --git a/platform/features/clock/src/actions/AbstractStartTimerAction.js b/platform/features/clock/src/actions/AbstractStartTimerAction.js
index 8c1554965c..116a5e51f4 100644
--- a/platform/features/clock/src/actions/AbstractStartTimerAction.js
+++ b/platform/features/clock/src/actions/AbstractStartTimerAction.js
@@ -35,10 +35,21 @@ define(
          * Both "Start" and "Restart" share this implementation, but
          * control their visibility with different `appliesTo` behavior.
          *
-         * @implements Action
+         * @implements {Action}
+         * @memberof platform/features/clock
+         * @constructor
+         * @param {Function} now a function which returns the current
+         *        time (typically wrapping `Date.now`)
+         * @param {ActionContext} context the context for this action
          */
         function AbstractStartTimerAction(now, context) {
-            var domainObject = context.domainObject;
+            this.domainObject = context.domainObject;
+            this.now = now;
+        }
+
+        AbstractStartTimerAction.prototype.perform = function () {
+            var domainObject = this.domainObject,
+                now = this.now;
 
             function doPersist() {
                 var persistence = domainObject.getCapability('persistence');
@@ -49,13 +60,9 @@ define(
                 model.timestamp = now();
             }
 
-            return {
-                perform: function () {
-                    return domainObject.useCapability('mutation', setTimestamp)
-                        .then(doPersist);
-                }
-            };
-        }
+            return domainObject.useCapability('mutation', setTimestamp)
+                .then(doPersist);
+        };
 
         return AbstractStartTimerAction;
     }
diff --git a/platform/features/clock/src/actions/RestartTimerAction.js b/platform/features/clock/src/actions/RestartTimerAction.js
index 8c8a942281..ae490df99d 100644
--- a/platform/features/clock/src/actions/RestartTimerAction.js
+++ b/platform/features/clock/src/actions/RestartTimerAction.js
@@ -31,12 +31,25 @@ define(
          *
          * Behaves the same as (and delegates functionality to)
          * the "Start" action.
-         * @implements Action
+         *
+         * @extends {platform/features/clock.AbstractTimerAction}
+         * @implements {Action}
+         * @memberof platform/features/clock
+         * @constructor
+         * @param {Function} now a function which returns the current
+         *        time (typically wrapping `Date.now`)
+         * @param {ActionContext} context the context for this action
          */
         function RestartTimerAction(now, context) {
-            return new AbstractStartTimerAction(now, context);
+            AbstractStartTimerAction.prototype.apply(
+                this,
+                [ now, context ]
+            );
         }
 
+        RestartTimerAction.prototype =
+            Object.create(AbstractStartTimerAction.prototype);
+
         RestartTimerAction.appliesTo = function (context) {
             var model =
                 (context.domainObject && context.domainObject.getModel())
diff --git a/platform/features/clock/src/actions/StartTimerAction.js b/platform/features/clock/src/actions/StartTimerAction.js
index d7237c75e4..fb433608c3 100644
--- a/platform/features/clock/src/actions/StartTimerAction.js
+++ b/platform/features/clock/src/actions/StartTimerAction.js
@@ -32,12 +32,24 @@ define(
          * Sets the reference timestamp in a timer to the current
          * time, such that it begins counting up.
          *
-         * @implements Action
+         * @extends {platform/features/clock.AbstractTimerAction}
+         * @implements {Action}
+         * @memberof platform/features/clock
+         * @constructor
+         * @param {Function} now a function which returns the current
+         *        time (typically wrapping `Date.now`)
+         * @param {ActionContext} context the context for this action
          */
         function StartTimerAction(now, context) {
-            return new AbstractStartTimerAction(now, context);
+            AbstractStartTimerAction.prototype.apply(
+                this,
+                [ now, context ]
+            );
         }
 
+        StartTimerAction.prototype =
+            Object.create(AbstractStartTimerAction.prototype);
+
         StartTimerAction.appliesTo = function (context) {
             var model =
                 (context.domainObject && context.domainObject.getModel())