need help in modification with oracle export script

Hi,

Windows 2003, Oracle 8.1.7

I am trying to write a script for oracle export of whole database which i have to schedule every week. My script is as follows:

# export_full.bat 

exp userid=system/manager

file= e:\exportsorcl_%date:~4,2%-%date:~7,2%-%date:~12,2%.dmp

log=e:\exportsmysid_%date:~4,2%-%date:~7,2%-%date:~12,2%.log

full=y

consistent=y

--------------------------------  ********  -------------------------------

I would like to name each dump file by the date on which it is exported. When i try the above script, it creates a simple dump file like expdat.dmp and no logfile is generated.

can someone please help me in correcting this script.