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https://issues.apache.org/jira/browse/LUCENE-1070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12570412#action_12570412
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Kevin Conaway commented on LUCENE-1070:
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If the behavior is correct, it is extremely unintuitive.
One would expect that dateToString() and stringToDate() would be symmetric.
> DateTools with DAY resoltion dosn't work depending on your timezone
> -------------------------------------------------------------------
>
> Key: LUCENE-1070
> URL: https://issues.apache.org/jira/browse/LUCENE-1070
> Project: Lucene - Java
> Issue Type: Bug
> Affects Versions: 2.2
> Reporter: Mike Baroukh
>
> Hi.
> There is another issue, closed, that introduced a bug :
> https://issues.apache.org/jira/browse/LUCENE-491
> Here is a simple TestCase :
> DateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm");
> Date d1 = df.parse("10/10/2008 10:00");
> System.err.println(DateTools.dateToString(d1, Resolution.DAY));
> Date d2 = df.parse("10/10/2008 00:00");
> System.err.println(DateTools.dateToString(d2, Resolution.DAY));
> this output :
> 20081010
> 20081009
> So, days are the same, but with DAY resolution, the value indexed doesn't
> refer to the same day.
> This is because of DateTools.round() : using a Calendar initialised to GMT
> can make that the Date given is on yesterday depending on my timezone .
> The part I don't understand is why take a date for inputfield then convert
> it to calendar then convert it again before printing ?
> This operation is supposed to "round" the date but using simply DateFormat to
> format the date and print only wanted fields do the same work, isn't it ?
> The problem is : I see absolutly no solution actually. We could have a
> WorkAround if datetoString() took a Date as inputField but with a long, the
> timezone is lost.
> I also suppose that the correction made on the other issue
> (https://issues.apache.org/jira/browse/LUCENE-491) is worse than the bug
> because it correct only for those who use date with a different timezone than
> the local timezone of the JVM.
> So, my solution : add a DateTools.dateToString() that take a Date in
> parameter and deprecate the version that use a long.
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