The Accidental Rubyist

invalid byte sequence in UTF-8

Ruby time conversion with daylight saving

with 3 comments

I had earlier posted that ruby was not taking DST into account when creating a date with EST as the timezone.
Finally got something working thanks to tzinfo. Needs to be installed separately.

 1 #!/usr/bin/env ruby -w
 2 # input may be given as "2:00 PM"  or "14:00"
 3 #
 4 require 'rubygems'
 5 require 'tzinfo'
 6 require 'time'
 8 timestr=ARGV[0];
 9 tz = TZInfo::Timezone.get('America/New_York')
10 tz1 = TZInfo::Timezone.get('Asia/Calcutta')
11 #local = tz.utc_to_local(Time.utc(2008,9,4,14,00,0))
12 local = tz.local_to_utc(Time.parse(timestr))
13 puts tz1.utc_to_local(local)

Please let me know if there is a cleaner way to do this. I should prefer the user to input EST or PST etc and get the correct value, rather than my having to manually edit the code.
source of time convert.
To install tzinfo: sudo gem install tzinfo

$ sudo port upgrade ruby
ruby 1.8.7 (2008-06-20 patchlevel 22) [powerpc-darwin9.4.0]

# substitute (find and replace) “foo” with “bar” on each line
$ cat | ruby -pe ‘gsub(/foo/, “bar”)’


Written by totalrecall

September 4, 2008 at 10:54 pm

Posted in ruby

3 Responses

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  1. Thanks! Very useful, much more convenient than changing the Time zone globally with = “foo”

    BTW from the Rails env you don’t need the require statements, TZInfo::Timezone is available already.


    September 16, 2009 at 5:20 am

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