i try to use range faceting in solr 3.1 using facet.range=date,
f.date.facet.range.gap=+1DAY, f.date.facet.range.start=NOW/DAY-5DAYS, and
f.date.facet.range.end=NOW/DAY
and i get this exception 

Exception during facet.range of date org.apache.solr.common.SolrException:
Can't add gap 1DAYS to value Sun Nov 13 00:00:00 UTC 2011 for field: date at
org.apache.solr.request.SimpleFacets$RangeEndpointCalculator.addGap(SimpleFacets.java:1093)
at
org.apache.solr.request.SimpleFacets.getFacetRangeCounts(SimpleFacets.java:873)
at
org.apache.solr.request.SimpleFacets.getFacetRangeCounts(SimpleFacets.java:839)
at
org.apache.solr.request.SimpleFacets.getFacetRangeCounts(SimpleFacets.java:778)
at
org.apache.solr.request.SimpleFacets.getFacetCounts(SimpleFacets.java:178)
at
org.apache.solr.handler.component.FacetComponent.process(FacetComponent.java:72)
at
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:194)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1360) at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:356)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:182)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662) Caused by:
java.text.ParseException: Unrecognized command: " " at
org.apache.solr.util.DateMathParser.parseMath(DateMathParser.java:277) at
org.apache.solr.request.SimpleFacets$DateRangeEndpointCalculator.parseAndAddGap(SimpleFacets.java:1188)
at
org.apache.solr.request.SimpleFacets$DateRangeEndpointCalculator.parseAndAddGap(SimpleFacets.java:1160)
at
org.apache.solr.request.SimpleFacets$RangeEndpointCalculator.addGap(SimpleFacets.java:1091)
... 27 more
can you help me plz
thanks in advance :)

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