I have a record foo in the database which has :start_time and :timezone attributes.

The :start_time is a Time in UTC - 2001-01-01 14:20:00, for example. The :timezone is a string - America/New_York, for example.

I want to create a new Time object with the value of :start_time but whose timezone is specified by :timezone. I do not want to load the :start_time and then convert to :timezone, because Rails will be clever and update the time from UTC to be consistent with that timezone.

Currently,

t = foo.start_time
=> 2000-01-01 14:20:00 UTC
t.zone
=> "UTC"
t.in_time_zone("America/New_York")
=> Sat, 01 Jan 2000 09:20:00 EST -05:00

Instead, I want to see

=> Sat, 01 Jan 2000 14:20:00 EST -05:00

ie. I want to do:

t
=> 2000-01-01 14:20:00 UTC
t.zone = "America/New_York"
=> "America/New_York"
t
=> 2000-01-01 14:20:00 EST
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