如何从现有的 Time.zone for Rails 创建 Ruby DateTime？
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How to create a Ruby DateTime from existing Time.zone for Rails?
提问by at.
I have users entering in dates in a Ruby on Rails website. I parse the dates into a DateTime object with something like:
我有用户在 Ruby on Rails 网站中输入日期。我将日期解析为 DateTime 对象，如下所示：
date = DateTime.new(params[:year].to_i, params[:month].to_i, params[:day].to_i, params[:hour].to_i, params[:minute].to_i)
or
或者
date = DateTime.parse(params[:date])
Both DateTimes will notbe in the time zone of the user which I previously set with something like:
两个DateTimes 都不会在我之前设置的用户的时区中，例如：
Time.zone = "Pacific Time (US & Canada)"
How do I parse the above DateTimes to be in the right time zone? I know the DateTime.newmethod has a 7th argument for the time offset. Is there an easy way to look up the offset for a time zone in a given time? Or should I be using something other than DateTime?
如何将上述DateTimes解析为正确的时区？我知道该DateTime.new方法具有时间偏移的第 7 个参数。有没有一种简单的方法可以在给定时间内查找时区的偏移量？或者我应该使用除DateTime?
采纳答案by at.
You can use Time.zone.localif you set Time.zonepreviously:
Time.zone.local如果您Time.zone之前设置，您可以使用：
user_time = Time.zone.local(params[:year].to_i, params[:month].to_i, params[:day].to_i, params[:hour].to_i, params[:minute].to_i, 0)
Have a look at the ActiveSupport::TimeWithZonedocumentation.
回答by shweta
Try:
尝试：
Time.zone = "Pacific Time (US & Canada)"
Time.zone.parse('8-11-2013 23:59:59') #=> Fri, 08 Nov 2013 23:59:59 PST -08:00
OR
或者
Time.now.in_time_zone("Pacific Time (US & Canada)")
OR
或者
DateTime.now.in_time_zone("Pacific Time (US & Canada)")
回答by SriramK89
You can use the following code to create a DateTimeobject with your desired TimeZone.
您可以使用以下代码创建DateTime具有所需TimeZone.
DateTime.new(2013, 6, 29, 10, 15, 30).change(:offset => "+0530")
UPDATE: With new1.9.1 version of RailsRuby, the below line does the same job like a magic.
更新：使用新的1.9.1 版本的RailsRuby，下面这行就像魔法一样完成了同样的工作。
DateTime.new(2013, 6, 29, 10, 15, 30, "+0530")
Documentation here
文档在这里
回答by Tun
DateTime.newaccepts optional offsetargument (as the seventh) starting from ruby 1.9.1
DateTime.new从 ruby 1.9.1 开始接受可选的偏移参数（作为第七个）
We can write
我们可以写
DateTime.new(2018, 1, 1, 0, 0, 0, Time.zone.formatted_offset)
回答by Adreamus
If you have already a correct DateTime object with the name 'datetime', and you want to copy it, you can simply call the 'getutc' on it and after that use the 'in_time_zone'
如果您已经有一个名为“datetime”的正确 DateTime 对象，并且您想复制它，您可以简单地调用它的“getutc”，然后使用“in_time_zone”
DateTime.new(datetime.getutc.year, datetime.getutc.month, datetime.getutc.day, time.getutc.hour, time.getutc.min).in_time_zone
