Adding CreatedDate to an entity using Entity Framework 5 Code First

Question

I am trying to add a CreatedDate property to entities in my Model and am using EF5 Code First. I want this date to not be changed once set, I want it to be a UT

Answer 1

Accounts account;
account.Acct_JoinDate = DateTime.Now.ToUniversalTime();
data.Accounts.Add(account);
data.SaveChanges();

Why not give the timestamp upon model creation? Similar to these accounts here.