diff --git a/pro_time/lib/model/time.dart b/pro_time/lib/model/time.dart
index a6fdb82..4b4cde0 100644
--- a/pro_time/lib/model/time.dart
+++ b/pro_time/lib/model/time.dart
@@ -44,20 +44,29 @@ class TimerInfo {
 }
 
 class ProTimeStopwatch {
-  final Stopwatch _stopWatch = Stopwatch();
   Duration _initialOffset;
+  DateTime _start;
 
   ProTimeStopwatch({Duration initialOffset = Duration.zero})
       : _initialOffset = initialOffset;
 
-  start() => _stopWatch.start();
+  start() {
+    _start = DateTime.now();
+  }
 
-  stop() => _stopWatch.stop();
+  stop() {
+    if (_start != null) {
+      _initialOffset += DateTime.now().difference(_start);
+      _start = null;
+    }
+  }
 
   reset({Duration newInitialOffset}) {
-    _stopWatch.reset();
-    _initialOffset = newInitialOffset ?? _initialOffset;
+    _start = null;
+    _initialOffset = newInitialOffset ?? Duration.zero;
   }
 
-  Duration get elapsed => _stopWatch.elapsed + _initialOffset;
+  Duration get elapsed =>
+      (_start != null ? DateTime.now().difference(_start) : Duration.zero) +
+      _initialOffset;
 }
diff --git a/pro_time/pubspec.yaml b/pro_time/pubspec.yaml
index 61577af..b480f19 100644
--- a/pro_time/pubspec.yaml
+++ b/pro_time/pubspec.yaml
@@ -1,7 +1,7 @@
 name: pro_time
 description: Projects time tracking app.
 
-version: 1.3+7
+version: 1.3.1+8
 
 environment:
   sdk: ">=2.2.0 <3.0.0"