title: Excel, Stop update NOW(), when other cell changed value or string
body: <p>I've in a single row of excel
  Start Time, End Time, Duration &amp; Status
  <a href="https://i.stack.imgur.com/VLgfX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VLgfX.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/xkRrm.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xkRrm.jpg" alt="enter image description here"></a></p>
  
  <p>End time is being calculated using NOW(), function of excel. I want this to be stop updating value. If status cell in the row is changed to Stop from Running.
  This Stop is being done by manually.</p>