diff --git a/lib/timeline/TimeStep.js b/lib/timeline/TimeStep.js
index b3dfce5a46..945d72fdd9 100644
--- a/lib/timeline/TimeStep.js
+++ b/lib/timeline/TimeStep.js
@@ -34,7 +34,7 @@ class TimeStep {
     * @constructor  TimeStep
     */
   constructor(start, end, minimumStep, hiddenDates, options) {
-    this.moment = moment;
+    this.moment = (options && options.moment) || moment;
 
     // variables
     this.current = this.moment();
@@ -165,7 +165,7 @@ class TimeStep {
         default: break;
       }
       if (!priorCurrent.isSame(this.current)) {
-          this.current = moment(DateUtil.snapAwayFromHidden(this.hiddenDates, this.current.valueOf(), -1, true));
+          this.current = this.moment(DateUtil.snapAwayFromHidden(this.hiddenDates, this.current.valueOf(), -1, true));
       }
     }
   }