Solr date range and specific date -

i index data include date in solr when search specific date, record (not record) include record in next day example:

http://localhost:8080/solr/select/?q=pubdate:[2010-03-25t00:00:00z 2010-03-25t23:59:59z]&start=0&rows=10&indent=on&sort=pubdate desc 

i have 625000 record in 2010-03-25 above query result return 325412 include 14 record 2010-03-26.

also try below query, not right result

http://localhost:8080/solr/select/?q=pubdate:"2010-03-25t00:00:00z"&start=0&rows=10&indent=on&sort=pubdate desc 

how right result specific date?

could please me?