title: Flutter: SharedPrefs how to store value and display it individually in list item
body: <p>So in my app I have ListView.Builder with creates a list of items. Each list item has a Button and this <code>Text(Items.lastPressDate.value)</code>. I use ValueNotifier to change text. Initially I used only ValueNotifier to change it's value on button press and set current date. But it changes it for every list item.</p>
  <p>I want to use SharedPreferenses to store DateTime as String info. How can I store DateTime with SharedPreferenses for individual list item.</p>
  <p>Basically, when I press button it should save DateTime as String and change ValueNotifier of list item where it was pressed</p>