Ruby-on-rails 如何在特定时区（最好是我的应用程序的默认时区，而不是 UTC）中创建新的 DateTime 对象？
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How to create a new DateTime object in a specific time zone (preferably the default time zone of my app, not UTC)?
提问by user664833
I have set the time zone in /config/application.rb, and I expect all times generated in my app to be in this time zone by default, yet when I create a new DateTimeobject (using .new), it creates it in GMT. How can I get it to be in my app's time zone?
我已经在 中设置了时区/config/application.rb，并且我希望我的应用程序中生成的所有时间默认都在这个时区中，但是当我创建一个新DateTime对象（使用.new）时，它会在GMT. 我怎样才能让它在我的应用程序的时区？
/config/application.rb
/配置/应用程序.rb
config.time_zone = 'Pacific Time (US & Canada)'
irb
irb
irb> DateTime.now
=> Wed, 11 Jul 2012 19:04:56 -0700
irb> mydate = DateTime.new(2012, 07, 11, 20, 10, 0)
=> Wed, 11 Jul 2012 20:10:00 +0000 # GMT, but I want PDT
Using in_time_zonedoesn't work because that just converts the GMT time to PDT time, which is the wrong time:
使用in_time_zone不起作用，因为这只是将 GMT 时间转换为 PDT 时间，这是错误的时间：
irb> mydate.in_time_zone('Pacific Time (US & Canada)')
=> Wed, 11 Jul 2012 13:10:00 PDT -07:00 # wrong time (I want 20:10)
采纳答案by Peter Brown
You can use ActiveSupport's TimeWithZone(Time.zone) object to create and parse dates in the time zone of your application:
您可以使用 ActiveSupport 的TimeWithZone( Time.zone) 对象在您的应用程序的时区中创建和解析日期：
1.9.3p0 :001 > Time.zone.now
=> Wed, 11 Jul 2012 19:47:03 PDT -07:00
1.9.3p0 :002 > Time.zone.parse('2012-07-11 21:00')
=> Wed, 11 Jul 2012 21:00:00 PDT -07:00
回答by hangsu
Another way without string parsing:
另一种没有字符串解析的方法：
irb> Time.zone.local(2012, 7, 11, 21)
=> Wed, 07 Nov 2012 21:00:00 PDT -07:00
回答by ewH
If I have it, I usually just specify the utc_offset when instantiating Time.new or DateTime.new.
如果我有它，我通常只在实例化 Time.new 或 DateTime.new 时指定 utc_offset。
[1] pry(main)> Time.new(2013,01,06, 11, 25, 00) #no specified utc_offset defaults to system time
=> 2013-01-06 11:25:00 -0500
[2] pry(main)> Time.new(2013,01,06, 11, 25, 00, "+00:00") #UTC
=> 2013-01-06 11:25:00 +0000
[3] pry(main)> Time.new(2013,01,06, 11, 25, 00, "-08:00") #PST
=> 2013-01-06 11:25:00 -0800
回答by JustJonG
This can be achieved in the DateTime class as well by including the timezone.
这也可以通过包含时区在 DateTime 类中实现。
2.5.1 :001 > require 'rails'
=> true
2.5.1 :002 > mydate = DateTime.new(2012, 07, 11, 20, 10, 0)
=> Wed, 11 Jul 2012 20:10:00 +0000
2.5.1 :003 > mydate = DateTime.new(2012, 07, 11, 20, 10, 0, "PST")
=> Wed, 11 Jul 2012 20:10:00 -0800
or
或者
https://docs.ruby-lang.org/en/2.6.0/DateTime.html
https://docs.ruby-lang.org/en/2.6.0/DateTime.html
2.6.0 :001 > DateTime.new(2012, 07, 11, 20, 10, 0, "-06")
=> Wed, 11 Jul 2012 20:10:00 -0600
2.6.0 :002 > DateTime.new(2012, 07, 11, 20, 10, 0, "-05")
=> Wed, 11 Jul 2012 20:10:00 -0500
回答by Michael Hagar
If you want to create a DateTime in a local timezone differentthan what is set as config.time_zone:
如果要在不同于设置的本地时区中创建 DateTime config.time_zone：
la_date = ActiveSupport::TimeZone["America/Los_Angeles"].parse('2020-02-01')
DateTime.new(la_date.year, la_date.month, la_date.day, la_date.hour, la_date.min, la_date.sec, la_date.zone)
回答by drhenner
I do the following in ApplicationController to set the timezone to the user's time.
我在 ApplicationController 中执行以下操作以将时区设置为用户的时间。
I'm not sure if this is what you want.
我不确定这是否是你想要的。
class ApplicationController < ActionController::Base
before_filter :set_timezone
def set_timezone
# current_user.time_zone #=> 'London'
Time.zone = current_user.time_zone if current_user && current_user.time_zone
end
end
