From 62a4c25fee8d097c2f3e363e0f9a7e65ccb45d4c Mon Sep 17 00:00:00 2001
From: ko tainen <TonyK@hyvesolutions.com>
Date: Fri, 13 Mar 2020 18:21:54 +0800
Subject: [PATCH 1/2] save duration when restart

---
 basic_stop_watch/src/StopWatch.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/basic_stop_watch/src/StopWatch.js b/basic_stop_watch/src/StopWatch.js
index 6ff838b..0245a79 100644
--- a/basic_stop_watch/src/StopWatch.js
+++ b/basic_stop_watch/src/StopWatch.js
@@ -28,9 +28,10 @@ class StopWatch extends React.Component {
   }
 
   onStart = () => {
+    let diff = this.state.currentTime - this.state.startTime;
     this.setState({
       isStarted: true,
-      startTime: new Date(),
+      startTime: new Date() - diff,
       currentTime: new Date(),
     });
 

From 1f7d311aa288e25e17cceac8e3b471ce3fee5175 Mon Sep 17 00:00:00 2001
From: ko tainen <TonyK@hyvesolutions.com>
Date: Fri, 13 Mar 2020 23:03:39 +0800
Subject: [PATCH 2/2] simplify the solution

---
 basic_stop_watch/src/StopWatch.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/basic_stop_watch/src/StopWatch.js b/basic_stop_watch/src/StopWatch.js
index 0245a79..0908295 100644
--- a/basic_stop_watch/src/StopWatch.js
+++ b/basic_stop_watch/src/StopWatch.js
@@ -28,10 +28,9 @@ class StopWatch extends React.Component {
   }
 
   onStart = () => {
-    let diff = this.state.currentTime - this.state.startTime;
     this.setState({
       isStarted: true,
-      startTime: new Date() - diff,
+      startTime: new Date() - this.state.currentTime - this.state.startTime,
       currentTime: new Date(),
     });