Modifying Custom AD Attributes w/Powershell

Recently I needed to create a custom user attribute within our Active Directory environment.  Rather than manually edit each user with the new value, I thought of using Powershell to automate the process.  I began testing the process using set-aduser.  Generally you'd find the associated property and add the value:

set-aduser username -EmailAddress username@domain.com

The custom attribute I created was EmployeeDOB so I ran the same command but the property was not recognized.  After some research and help from the Technet forums, I was introduced to the following options:

set-aduser username -Add @{EmployeeDOB='5-1-1978'}

set-aduser username -Replace @{EmployeeDOB='4-1-1980'}

set-aduser username -Remove @{EmployeeDOB='4-1-1980'}

With this new knowledge, I can now hopefully save some time by not having to manually edit these values within ADUC!!