Ruby / Rails – Change the timezone of a Time, without changing the value

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Sounds like you want something along the lines of 

ActiveSupport::TimeZone.new('America/New_York').local_to_utc(t)

This says convert this local time (using the zone) to utc. If you have Time.zone set then you can of course to

Time.zone.local_to_utc(t)

This won’t use the timezone attached to t – it assumes that it’s local to the time zone you are converting from.

One edge case to guard against here is DST transitions: the local time you specify may not exist or may be ambiguous.

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