title: .NET Get timezone offset by timezone name
body: <p>In database I store all date/times in UTC. </p>
  
  <p>I know user's timezone name ("US Eastern Standard Time" for example).</p>
  
  <p>In order to display correct time I was thinking that I need to add user's timezone offset to UTC date/time. But how would I get timezone offset by timezone name?</p>
  
  <p>Thank You!</p>