How to use default database for CreateDate column in EF code-first 4.3?

I would like to have a column CreatedDatein my table Accountsdefined as follows:

CreatedDate DATETIME NOT NULL DEFAULT GETUTCDATE()

This will map to the CreatedDate property in the class:

public class Account
{
    public DateTime? CreatedDate { get; private set; }
    // ... other properties ...
}

When creating a new account, I would like to leave the CreateDate value NULL, and let the database populate it. When loading an existing account from the database, I would like EF to retrieve the CreateDate file created from the database.

I am using the first EF 4.3 code with explicit migration. When EF created the migration for the account table, I changed it as follows:

CreatedDate = c.DateTime(nullable: false, defaultValueSql: "GETUTCDATE()"),

Unfortunately, when I try to map a table using EF 4.3, EF tries to insert a NULL value in the CreatedDate column.

DatabaseGeneratedOption.Identity . . DatabaseGeneratedOption.Computed, NULL. - .

OnModelCreating:

modelBuilder.Entity<Account>().Property(a => a.CreatedDate)
    .HasDatabaseGeneratedOption(DatabaseGeneratedOption.Computed);

- ?

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