It sounds more like you are asking how to remove 2012 from several pages, rather than how to edit the script to not put 2012 in to begin with. If I'm wrong about that, you might want to ask over at the scripting forum.
One easy way to remove 2012 is to use Find/Change. If you search for 2012 and leave the change field blank, it will replace 2012 with nothing. In the Find/Change window, there is a field that will let you search from the cursor location to the end of the current story, the whole story, all stories in the document, or all open documents. If you set it to Document, you can use the find button to find the first instance, and if you want to delete it, you can hit either Change, Change/Find (which will change it and look for the next instance), or Change All. I'd use Change/Find, in the event you have 2012 on another part of the calendar that you want to keep. You can also have it look for the text only when it has a particular paragraph or character style, and change to the same or a different paragraph or character style. To do that, click in the Find Format and Change Format boxes. To clear them out, hit the little trash can icon next to the field.