can I easily replace a default value throughout my database?

I have SQL Server management studio express, which I use to manage a database for my website, which is hosted on a shared server in cyberspace. 

I have been using 'getdate()' as a default in many of my tables, for a field that I name "dateEntered".  So when records are added to these tables, the date and time that they were added is inserted as well.

Now I want to place all the getdate()'s by getutcdate().

That way, no matter what time zone the server database is hosted at, I can base my date calculations on a standard time zone.

The database is full of test data now, but not real data.

So I could delete the database, after scripting the whole database to a sql file, and doing a find/replace of getdate/getutcdate and then executing the script to create the database.

However, perhaps there is a stored procedure I could write that would allow me not to lose all my test data, and yet accomplish the same thing.  

Is that feasible?

Thanks.