title: Rails 4: What data type should I use to save user's timezone?
body: <p>I want to store each user's timezone in his/her profile but I'm not sure which data type I should use. </p>
  
  <p>Should I add a column called "Timezone" with :string as the data type?</p>
  
  <p>If I do that, should I use the options that rails provides for time zones (ie. "America/New_York")?</p>
  
  <p>Or should I use :decimal and store a modifier to UTC?</p>
  
  <p>Is there a gem for this?</p>
  
  <p>UPDATE: I should clarify that I'm storing their preferred timezone so I can't just store timezone from the client browser in case the user travels a lot. I'll have a CRON job set up to run at midnight daily according to the user's timezone.</p>