Ruby's strptime %z parses things that I didn't expect it to. Equivalent examples from other languages welcome.

1_percent_z_parse_examples.rb

#!/usr/bin/env ruby -wKU

require 'date'

# strptime %z parses all of the following in Ruby

iso_8601_timezones = %[
Z
UTC
PST
PDT
NZDT
+00
-00
+0000
-0000
+00:00
-00:00
Pacific Standard Time
Eastern Daylight Time
Hawaiian
Dateline
Samoa
].strip.split("\n")

iso_8601_timezones.each do |tz|
  dt_str = "2013-01-01T00:00:00#{tz}"
  parsed_time = DateTime.strptime(dt_str, "%Y-%m-%dT%H:%M:%S%z").to_time
  puts "#{dt_str}\t#{parsed_time}"
end

2_output.txt

$ rbenv shell 1.9.3-p448; ./percent_z_strptime.rb
2013-01-01T00:00:00Z	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00UTC	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00PST	2013-01-01 00:00:00 -0800
2013-01-01T00:00:00PDT	2012-12-31 23:00:00 -0800
2013-01-01T00:00:00NZDT	2012-12-31 03:00:00 -0800
2013-01-01T00:00:00+00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00-00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00+0000	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00-0000	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00+00:00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00-00:00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00Pacific Standard Time	2013-01-01 00:00:00 -0800
2013-01-01T00:00:00Eastern Daylight Time	2012-12-31 20:00:00 -0800
2013-01-01T00:00:00Hawaiian	2013-01-01 02:00:00 -0800
2013-01-01T00:00:00Dateline	2013-01-01 04:00:00 -0800
2013-01-01T00:00:00Samoa	2013-01-01 03:00:00 -0800


$ rbenv shell 2.0.0-p247; ./percent_z_strptime.rb
ruby: warning: -K is specified; it is for 1.8 compatibility and may cause odd behavior
2013-01-01T00:00:00Z	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00UTC	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00PST	2013-01-01 00:00:00 -0800
2013-01-01T00:00:00PDT	2012-12-31 23:00:00 -0800
2013-01-01T00:00:00NZDT	2012-12-31 03:00:00 -0800
2013-01-01T00:00:00+00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00-00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00+0000	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00-0000	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00+00:00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00-00:00	2012-12-31 16:00:00 -0800
2013-01-01T00:00:00Pacific Standard Time	2013-01-01 00:00:00 -0800
2013-01-01T00:00:00Eastern Daylight Time	2012-12-31 20:00:00 -0800
2013-01-01T00:00:00Hawaiian	2013-01-01 02:00:00 -0800
2013-01-01T00:00:00Dateline	2013-01-01 04:00:00 -0800
2013-01-01T00:00:00Samoa	2013-01-01 03:00:00 -0800