Trying to facet date

[temesoft]

Hello.

I am trying to get faceted results for a given query using facet date with gap of 1 day and also using date as a string facet field.
This is the result i get back:

<response>
<lst name="responseHeader">
<int name="status">0</int>
<int name="QTime">442</int>
<lst name="params">
<str name="facet.date.start">2012-01-01T00:00:00.000Z</str>
<str name="facet">true</str>
<str name="echoParams">explicit</str>
<str name="q">*:*</str>
<str name="facet.date">date</str>
<str name="facet.date.gap">+1DAY</str>
<arr name="facet.field">
<str>date</str>
<str>scan</str>
</arr>
<str name="facet.date.end">2012-07-01T00:00:00.000Z</str>
<str name="rows">0</str>
</lst>
</lst>
<result name="response" numFound="18" start="0"/>
<lst name="facet_counts">
<lst name="facet_queries"/>
<lst name="facet_fields">
<lst name="date">
<int name="2012-06-11T23:44:16.164Z">1</int>
<int name="2012-06-11T23:47:57.442Z">1</int>
<int name="2012-06-13T23:10:18.938Z">1</int>
<int name="2012-06-13T23:10:38.106Z">1</int>
<int name="2012-06-13T23:10:54.24Z">1</int>
<int name="2012-06-13T23:11:41.155Z">1</int>
<int name="2012-06-13T23:12:29.947Z">1</int>
<int name="2012-06-16T15:31:24.307Z">1</int>
<int name="2012-06-25T15:51:10.243Z">1</int>
<int name="2012-06-25T22:40:50.414Z">1</int>
<int name="2012-06-26T19:51:13.286Z">1</int>
<int name="2012-06-29T01:15:48.714Z">1</int>
<int name="2012-07-08T23:52:01.067Z">1</int>
<int name="2012-07-09T20:30:50.056Z">1</int>
<int name="2012-07-10T18:45:40.657Z">1</int>
<int name="2012-07-10T18:46:31.474Z">1</int>
<int name="2012-07-16T01:18:08.111Z">1</int>
<int name="2012-07-16T01:19:25.378Z">1</int>
</lst>
<lst name="scan">
<int name="false">11</int>
<int name="true">7</int>
</lst>
</lst>
<lst name="facet_dates"/>
<lst name="facet_ranges"/>
</lst>
</response>

As you can see the facet_dates tag is empty but the date field is present in every document and indexed.
You can also see the params sent. Am i doing something wrong?

Thanks
-D