Ruby time conversion with daylight saving

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 # http://tzinfo.rubyforge.org/doc/files/README.html
 4 require 'rubygems'
 5 require 'tzinfo'
 6 require 'time'
 7
 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)
14 

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”)’

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