ruby - How does Rails know my timezone? -

how rails know time zone? don't have set in application.rb:

# config.time_zone = 'central time (us & canada)' 

i searched whole app time_zone , instance of it. don't see environment variables time zone set either. i'm on windows.

c:\users\chloe\workspace\mybestbody>rails runner "p time.now" dl deprecated, please use fiddle 2015-06-12 23:38:33 -0400 

it prints utc time when deployed heroku.

c:\users\chloe\workspace\mybestbody>heroku run rails console running `rails console` attached 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

from gettimeofday(), or ruby mri source have me believe:

int __cdecl gettimeofday(struct timeval *tv, struct timezone *tz) {      filetime ft;       getsystemtimeasfiletime(&ft);      filetime_to_timeval(&ft, tv);       return 0; } 

per comment, c function, called ruby date routines under hood. not call method yourself, rather call ruby methods calling.