time command

[Yu Cha Yung]

   Hi,
   I am trying to export the output of time into a text file but failed = using
   the following command:
   time ls > time.txt
   It doesnt show the information of time in time.txt.
   I also try the commnad:
   time -o time.txt ls
   but i get the following error:
   bash: -o: command not found
   basically i try all the option for time and only -p option works. Do you    
have any ideas on this matter? Thx!
   Regards
   Cha Yung