Rails 如何知道我的时区? [英] How does Rails know my timezone?

问题描述

Rails 如何知道我的时区?我没有在 application.rb 中设置它:

How does Rails know my time zone? I don't have it set in application.rb:

# config.time_zone = 'Central Time (US & Canada)'

我在整个应用程序中搜索了 time_zone，这是它的唯一实例.我也没有看到时区设置的任何环境变量.我使用的是 Windows.

I searched the whole app for time_zone and that is the only instance of it. I don't see any environment variables for time zone set either. I'm on Windows.

C:\Users\Chloe\workspace\MyBestBody>rails runner "p Time.now"
DL is deprecated, please use Fiddle
2015-06-12 23:38:33 -0400

它在部署到 Heroku 时打印 UTC 时间.

It prints UTC time when deployed to Heroku.

C:\Users\Chloe\workspace\MyBestBody>heroku run rails console
Running `rails console` attached to terminal... up, run.1949
Loading production environment (Rails 4.2.1)
irb(main):001:0> Time.new
=> 2015-06-13 03:28:34 +0000

Rails 4.2.1

推荐答案

从 gettimeofday() 开始，大约 ruby MRI 来源 让我相信:

From gettimeofday(), or so the ruby MRI source would have me believe:

int __cdecl
gettimeofday(struct timeval *tv, struct timezone *tz)
{
     FILETIME ft;

     GetSystemTimeAsFileTime(&ft);
     filetime_to_timeval(&ft, tv);

     return 0;
}

根据注释，这是一个 C 函数，由幕后的 ruby​​ 日期例程调用.您不会自己调用该方法，而是调用您正在调用的 ruby​​ 方法.

Per comment, this is a C function, called by the ruby date routines under the hood. You do not call the method yourself, rather you call the ruby methods you are calling.

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