Extend the expiration date of backup media in Symantec Netbackup

Today I needed to extend my expiration date for the file backups I had taken using Symantec Netbackup which had a expiration of 9 weeks. 

When my company decided to retain the backups for 2 years I needed to extend all my previous backups which was taken under the 9 week retention policy. So here is what you need to do to extend the expiration dates for  the old backups...

Go to the below command prompt on your netbackup server:

C:\Program Files\Veritas\NetBackup\bin\admincmd>bpexpdate -m <media id> -d 12/12/2013 00:00:00