Time.utc_offset is incorrect in small time range
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Key: JRUBY-4842
URL: http://jira.codehaus.org/browse/JRUBY-4842
Project: JRuby
Issue Type: Bug
Components: Standard Library
Affects Versions: JRuby 1.5, JRuby 1.4, JRuby 1.3.1
Environment: Windows XP SP2
c:\>java -version
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing)
c:\>jruby --version
jruby 1.4.1 (ruby 1.8.7 patchlevel 174) (2010-04-26 ea6db6a) (Java HotSpot(TM)
Client VM 1.6.0_18) [x86-java]
Reporter: Jared Dahl
Assignee: Thomas E Enebo
When testing on my PC (which is in the USA central time zone), the following
simple ruby code returns different values in Jruby (1.3.1, 1.4.1, and 1.5.0)
from Ruby (1.8.6, 1.8.7, and 1.9.1).
code:
puts Time.local(2010,3,13,20,59,59).utc_offset
puts Time.local(2010,3,13,21,00,00).utc_offset
puts Time.local(2010,3,13,21,59,59).utc_offset
puts Time.local(2010,3,13,22,59,59).utc_offset
puts Time.local(2010,3,14,1,0,0).utc_offset
puts Time.local(2010,3,14,1,59,0).utc_offset
puts Time.local(2010,3,14,3,0,0).utc_offset
Note that Daylight Saving Time started at 2:00 am CST on March 14. When I am
running Ruby (I tested with all ther versions I listed above and got the same
results), I get results that I expect. The offset goes from -6 hours to -5
hours after 2:00 am.
c:\>cd ruby\ruby1.8.6
c:\ruby\ruby1.8.6>cd bin
c:\ruby\ruby1.8.6\bin>ruby --version
ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]
c:\ruby\ruby1.8.6\bin>ruby c:\test.rb
-21600
-21600
-21600
-21600
-21600
-21600
-18000
When I run in Jruby, I get the following incorrect results.
C:\>jruby --version
jruby 1.4.1 (ruby 1.8.7 patchlevel 174) (2010-04-26 ea6db6a) (Java HotSpot(TM)
Client VM 1.6.0_18) [x86-java]
C:\>jruby -S test.rb
-21600
-18000
-18000
-18000
-18000
-18000
-18000
I do not think that it is a coincidence that JRuby made the jump to Daylight
Saving Time 5 hours early. When I change my PC to the Pacific Time Zone, it
makes the same mistake, but off by 7 hours instead. I think JRuby is making
the switch at 2:00 am GMT, instead of 2:00 am local time.
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