Unfortunately you cannot get the user's timezone from their request, as the client does not send the data. The locale in the request object is based on the user's Accept-Language header. What is the right timezone for "English"?
Two other possible approaches:
- Use GeoIP on the client's IP to have a stab at their location, and look up (from tz) a close timezone
- Use client-side Javascript to calculate their offset from UTC (subtract UTC from localtime), then look up timezones that match that offset (this will not be very granular as many timezones are e.g. +11 hours. You might be able to combine with the above).
There's no real good simple solution to this though -- which is why most sites will ask for the user's timezone, or display dates in a relative format (e.g. 5 hours ago).
