Globalization using tzinfo

Rails
1

Hi Gurus,
I want to globalize my project using tzinfo. I want to:

  1. use tzinfo to globalize my app.
  2. the app is already developed, so what is the accurate solution to
    implement it using minimal and centralize change.
  3. I have heard that tzinfo have some issues like not support all
    timezones?

please help.

Best
-Pavan