select object_name(s.object_id) as table_name, i.name as index_name,
last_user_update, user_updates
  from sys.dm_db_index_usage_stats as s
    join sys.indexes i on i.object_id = s.object_id and i.index_id = s.index_id
      where object_name(s.object_id) = 'InvHeader';

table_name index_name        last_user_update        user_updates
---------- ----------------- ----------------------- ------------
InvHeader  pk_invheader      2011-05-20 15:50:07.210 3713
InvHeader  uix_invheader     2011-05-19 19:15:01.370 371