To Create Time stamp in dump file during export

Hi All ,
While exporting table thDIRECTORY=USER_DATA_PUMP_DIR
DUMPFILE=expdp_tables%U.dmp
LOGFILE=expdp_tables.log
CONTENT=ALL
PARALLEL=4
ESTIMATE=STATISTICS
SCHEMAS=<Schema name >
When i ran the shell file i am getting dump file generated as
expdp_tables01.dmp
expdp_tables02.dmp
Could any one help how can i get the time stamp attached to the dump file .Its urgent kindly help me in this
Thanks

Munich,
Thanks for ur suggestions and the same need to be imported how can i do it in the import operation while my import par file has
DIRECTORY=DATA_PUMP_DIR
DUMPFILE=expdp_tables%U.dmp <<how can i get the sydate.dmp>>
LOGFILE=impdp_EIM_tables.log
CONTENT=DATA_ONLY
PARALLEL=4
TABLE_EXISTS_ACTION=TRUNCATE
EXCLUDE=GRANT
EXCLUDE=STATISTICS
EXCLUDE=TRIGGER
What are the option that i can give to get the sysdate.dmp in the par file that i have got from
mv exp.dmp exp.dmp.`date "+%d.%m.%Y"`
or can i give
DUMPFILE=expdp_tables%U'date'.dmp like that
Thanks

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To Create Time stamp in dump file during export

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