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Date: Sun, 18 Mar 2012 18:54:40 +0000 (UTC)
From: "David Schlotfeldt (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (SOLR-2690) Date Faceting or Range Faceting
 doesn't take timezone into account.
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    [ https://issues.apache.org/jira/browse/SOLR-2690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13232329#comment-13232329 ] 

David Schlotfeldt commented on SOLR-2690:
-----------------------------------------

Nguyen - Sorry for the slow response. I've been on vacation where I had no Internet. My brain is still on vacation so I might be wrong, but I believe the problem is your aren't rounding the start and end.

I believe this will leave the time part of the ranges as "00:00:00.00Z" (GMT). The timezone specified by 'tz' simply affects math done with dates (this includes when the gap is incremented).
start = 2007-07-30T00:00:00.000Z
end = 2007-07-31T00:00:00.000Z
gap = +1DAY
tz = Asia/Singapore

One way to get what you want, which is the way people have been saying to do it, is to adjust the start and end manually. (I believe Singapore is GMT+8)
start = 2007-07-30T00:08:00.000Z
end = 2007-07-31T00:08:00.000Z
gap = +1DAY
tz = Asia/Singapore

The issue with this approach is your "manual" adjusting gets tricking when talking about timezones that have day light savings time.  This is one place the patch makes things SOOOO much easier.

So you want to change your test to simply add '/DAY' to the end of each which will round the times to the beginning of the day. Since they rounding takes tz into account it will come out to 8:00.
start = 2007-07-30T00:00:00.000Z/DAY
end = 2007-07-31T00:00:00.000Z/DAY
gap = +1DAY
tz = Asia/Singapore

Let me know if that helps. (Again, brain not in programming mode yet so I may have completely misunderstood the issue.)
                
> Date Faceting or Range Faceting doesn't take timezone into account.
> -------------------------------------------------------------------
>
>                 Key: SOLR-2690
>                 URL: https://issues.apache.org/jira/browse/SOLR-2690
>             Project: Solr
>          Issue Type: Improvement
>    Affects Versions: 3.3
>            Reporter: David Schlotfeldt
>         Attachments: add-tz-parameter.patch, add-tz-parameter.patch, timezone-facet-component.tgz
>
>   Original Estimate: 3h
>  Remaining Estimate: 3h
>
> Timezone needs to be taken into account when doing date math. Currently it isn't. DateMathParser instances created are always being constructed with UTC. This is a huge issue when it comes to faceting. Depending on your timezone day-light-savings changes the length of a month. A facet gap of +1MONTH is different depending on the timezone and the time of the year.
> I believe the issue is very simple to fix. There are three places in the code DateMathParser is created. All three are configured with the timezone being UTC. If a user could specify the TimeZone to pass into DateMathParser this faceting issue would be resolved.
> Though it would be nice if we could always specify the timezone DateMathParser uses (since date math DOES depend on timezone) its really only essential that we can affect DateMathParser the SimpleFacets uses when dealing with the gap of the date facets.
> Another solution is to expand the syntax of the expressions DateMathParser understands. For example we could allow "(?timeZone=VALUE)" to be added anywhere within an expression. VALUE would be the id of the timezone. When DateMathParser reads this in sets the timezone on the Calendar it is using.
> Two examples:
> - "(?timeZone=America/Chicago)NOW/YEAR"
> - "(?timeZone=America/Chicago)+1MONTH"
> I would be more then happy to modify DateMathParser and provide a patch. I just need a committer to agree this needs to be resolved and a decision needs to be made on the syntax used
> Thanks!
> David

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