Ruby-on-rails Rails：将 UTC DateTime 转换为另一个时区
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Rails: convert UTC DateTime to another time zone
提问by Drew Johnson
In Ruby/Rails, how do I convert a UTC DateTime to another time zone?
在 Ruby/Rails 中，如何将 UTC DateTime 转换为另一个时区？
回答by mckeed
time.in_time_zone(time_zone)
Example:
例子：
zone = ActiveSupport::TimeZone.new("Central Time (US & Canada)")
Time.now.in_time_zone(zone)
or just
要不就
Time.now.in_time_zone("Central Time (US & Canada)")
You can find the names of the ActiveSupport time zones by doing:
您可以通过执行以下操作找到 ActiveSupport 时区的名称：
ActiveSupport::TimeZone.all.map(&:name)
# or for just US
ActiveSupport::TimeZone.us_zones.map(&:name)
回答by vladCovaliov
if Time.zoneit's your desired time zone then you can use @date.to_time.to_datetime
如果Time.zone这是您想要的时区，那么您可以使用@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
回答by jbyler
In plain ruby, with only require 'date', use the new_offsetmethod:
在普通的 ruby 中，只有require 'date'，使用new_offset方法：
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.
使用在 Mac OS X 10.13 上标配的 ruby 2.3.7 进行测试。
回答by zdk
Just in case, if you are dealing with ActiveRecord object in Rails.
以防万一，如果您在 Rails 中处理 ActiveRecord 对象。
It might be a good idea to use Time.use_zonefor a per request basis timezone that overrides the default timezone set in config.time_zone
Time.use_zone对于每个请求基础时区使用它可能是一个好主意，它会覆盖在config.time_zone
More details I explain at https://stackoverflow.com/a/25055692/542995
回答by Fred
Try ActiveSupport's TimeWithZoneobjects 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.
尝试使用 TimeZone 操作的ActiveSupport 的TimeWithZone对象。ActiveSupport 还提供了 in_time_zone 方法，用于将 UTC 时间转换为指定的 TimeZone 时区。mckeed 的回答显示了代码。
回答by maudulus
I'm using simple_form in Rails 4 and I just added the input field as
我在 Rails 4 中使用 simple_form，我刚刚将输入字段添加为
<%= f.input :time_zone, :as => :time_zone %>
with the migration
随着迁移
class AddTimeZoneColumnToTextmessage < ActiveRecord::Migration
def change
add_column :textmessages, :time_zone, :string
end
end
