CODEWITHSUNDEEP
ruby-on-railsrubydatetimeruntime
Drew Johnson
Drew Johnson

Reputation: 19213

Rails: convert UTC DateTime to another time zone

In Ruby/Rails, how do I convert a UTC DateTime to another time zone?

Upvotes: 127

Views: 103352

Answers (6)

jbyler
jbyler

Reputation: 7847

In plain ruby, with only require 'date', use the new_offset method:

require 'date'

d=DateTime.parse('2000-01-01 12:00 +0200')
l=d.new_offset('-0700')
u=l.new_offset('UTC')
puts "#{u.strftime('%a %F %T %Z')} ❖ #{l.strftime('%a %F %T %Z')}"

Tested with ruby 2.3.7 that came standard on Mac OS X 10.13.

Upvotes: 5

vladCovaliov
vladCovaliov

Reputation: 4403

if Time.zone it's your desired time zone then you can use @date.to_time.to_datetime

> @date
=> Tue, 02 Sep 2014 23:59:59 +0000
> @date.class
=> DateTime
> @date.to_time
=> 2014-09-02 12:59:59 -1100
> @date.to_time.to_datetime
=> Tue, 02 Sep 2014 12:59:59 -1100

Upvotes: 10

zdk
zdk

Reputation: 1576

Just in case, if you are dealing with ActiveRecord object in Rails.

It might be a good idea to use Time.use_zone for a per request basis timezone that overrides the default timezone set in config.time_zone

More details I explain at https://stackoverflow.com/a/25055692/542995

Upvotes: 3

maudulus
maudulus

Reputation: 11035

I'm using simple_form in Rails 4 and I just added the input field as 

<%= f.input :time_zone, :as => :time_zone %>

with the migration 

class AddTimeZoneColumnToTextmessage < ActiveRecord::Migration
  def change
    add_column :textmessages, :time_zone, :string
  end
end

Upvotes: 0

mckeed
mckeed

Reputation: 9818

time.in_time_zone(time_zone)

Example:

zone = ActiveSupport::TimeZone.new("Central Time (US & Canada)")
Time.now.in_time_zone(zone)

or just

Time.now.in_time_zone("Central Time (US & Canada)")

You can find the names of the ActiveSupport time zones by doing:

ActiveSupport::TimeZone.all.map(&:name)
# or for just US
ActiveSupport::TimeZone.us_zones.map(&:name)

Upvotes: 232

Fred
Fred

Reputation: 8602

Try ActiveSupport's TimeWithZone objects manipulated with TimeZone. ActiveSupport also provides the in_time_zone method for converting a UTC time to a specified TimeZone time zone. mckeed's answer shows the code.

Upvotes: 3

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