Many times it becomes necessary to append date stamp on your export dumps. In Unix systems, shell scripting is very liberal with variables you can define yourself eg:
dat=`date ‘+%m%d%y %H:%M:%S’`
And then go onto define in your script as
./expdp system/system directory=export_dir dumpfile=exp_swx_$expdate.dmp logfile=exp_swx_$expdate.log schemas=swx
But on Windows it can be done in a more easier way, using the Date and Time function. Just input the string below as part of the file name any time you want the current system date and/or time included as part of the file name.
Example: copy c:\test.txt c:\test-%date:~4,2%-%date:~7,2%-%date:~12,2%.txt will output c:\test-mm-dd-yy.txt
exp edate/edate file=edate%date:~4,2%-%date:~7,2%-%date:~12,2%.dmp log=edate%date:~4,2%-%date:~7,2%-%date:~12,2%.txt owner=edate statistics=none
How to Add Date and Time to a Filename with Windows Command Line. | Easy Oracle DBA