title: Ruby:Change UTC time zone to UTC+ or UTC - zone
body: <p>I want to convert the utc time to 'utc+1' or 'utc+something' time zone and convert back that to utc time zone.</p>
  
  <p>Its something like that what i want to do. I am asking user to choose there UTC time zone ex: utc+4 .and i am getting current UTC time using Time.now.utc .Now i wwant to convert this utc time to 'utc+4'.</p>
  
  <p>And after displaying that time to 'utc+4' i want to convert back that time equivalent utc time zone.</p>
  
  <p>How this can be done?</p>