diff --git a/lib/stopwatch.js b/lib/stopwatch.js
index 32d1bc7..884e039 100644
--- a/lib/stopwatch.js
+++ b/lib/stopwatch.js
@@ -112,7 +112,7 @@ class StopWatch extends Component {
     }
 
     if (typeof this.props.getTime === "function")
-      this.props.getTime(formatted);
+      formatted = this.props.getTime(formatted);
 
     return formatted;
   }
diff --git a/lib/timer.js b/lib/timer.js
index 0076e40..d3ec26c 100644
--- a/lib/timer.js
+++ b/lib/timer.js
@@ -104,7 +104,7 @@ class Timer extends Component {
     }
 
     if (typeof this.props.getTime === "function")
-      this.props.getTime(formatted);
+      formatted = this.props.getTime(formatted);
 
     return formatted;
   }