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Editorial Team
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Asked: 2026-05-25T21:46:39+00:00

What I mean is that there are different timezones with the same name, like

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What I mean is that there are different timezones with the same name, like CST (-06:00 in US and +09:30 in Australia). Accordingly conversion to utc gives wrong results for Adelaide.

Any elegant way to solve this?

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1 Answer

  1. Editorial Team

    an easy way would be that you use the other nomenclature of naming time zones..
    e.g. for UTC+9:30 intstead of using CST, you can use “Australia/Adelaide”

    tz = TZInfo::Timezone.get("Australia/Adelaide")

t = Time.now   # you could also get the UTC time here with Time.now.utc
t.zone
 => "PDT" 
t.utc_offset
 => -25200 
t.in_time_zone(tz)    # this is a Rails extension of the Time class
 => Sat, 01 Oct 2011 14:31:05 CST +09:30 
t.in_time_zone(tz).zone
 => "CST" 
t.in_time_zone(tz).utc_offset
 => 34200

    See:
    http://api.rubyonrails.org/classes/Time.html

    http://tzinfo.rubyforge.org/doc/

    http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

    do a “gem install activesupport”, and in your script:

    require 'rubygems'
require 'tzinfo'
require 'active_support'
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