[ http://issues.apache.org/jira/browse/LUCENE-491?page=all ]
Daniel Naber closed LUCENE-491:
-------------------------------
Fix Version: 1.9
Resolution: Fixed
Thanks, I have committed your patch. I needed to make other changes to the old
test cases to keep them working. Maybe you can re-check to make sure everything
is okay now.
> DateTools needs to use UTC for correct collation,
> -------------------------------------------------
>
> Key: LUCENE-491
> URL: http://issues.apache.org/jira/browse/LUCENE-491
> Project: Lucene - Java
> Type: Bug
> Versions: CVS Nightly - Specify date in submission
> Environment: svn trunk at 02-Feb-2005, noon GMT. OS independent.
> Reporter: John Haxby
> Fix For: 1.9
> Attachments: patch, testcase.java
>
> If your local timezone is Europe/London then the times Sun, 30 Oct 2005
> 00:00:00 +0000 and exactly one hour later are both converted to 200530010000
> by DateTools.dateToString() with minute resolution. The Linux date command
> is useful in seeing why:
> $ date --date "Sun, 30 Oct 2005 00:00:00 +0000"
> Sun Oct 30 01:00:00 BST 2005
> $ date --date "Sun, 30 Oct 2005 01:00:00 +0000"
> Sun Oct 30 01:00:00 GMT 2005
> Both times are 1am in the morning, but one is when DST is in force, the other
> isn't. Of course, these are actually different times!
> Of course, if dates are stored in the index with implicit timezone
> information then not only do we get problems when the clocks go back at the
> end of summer, but we also have problems crossing timezones. If a database
> is created in California and used in Paris then the times are going to be
> badly skewed (there's a nine hour time difference most of the year).
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