Compare a table definition to function

Hello. I am trying to check if a table definition (the default value on a constraint) is equal to UTC Time by using the following query:

IF NOT EXISTS((SELECT object_definition(default_object_id) AS definition
FROM sys.columns
WHERE name = 'ModifiedDate'
AND object_id = object_id('dbo.WorkflowAudit')) == GETUTCDATE())

However, you can not compare a function (GETUTCDATE()) to this Select Statement. I need to do it this way because I am building an update script and it can only update the table IF the table definition is NOT equal to UTC TIME Any ideas? Thank you