Easy noob custom PHP question in views... Editing recent news stories view
It's probably easier to add the field to the field list (field_successdate). Then use Views rewrite display option to write the node: title link to include the date from field_successdate.

The rewrite will require the Token module to be enabled. rewrite the title as: [node:title] [node:field_successdate]

Be sure you hide field_successdate if you dont want it literally shown in the view by itself somewhere. You may or may not need to move field_successdate to the top of the field list so its gets made into a Token to be used in the title properly.

I'd make a pic of this .... but that'd take like minutes....