After updating to the latest EF Core 3 and therefore Npgsql 4.0 I've started to have some issues - which might have been pre-existing or not.

Say I have a model:

public class Model {
  public int Id { get; set; }
  public string Name { get; set; }
  public DateTime Created { get; set; }
}

After updating to version 4, I noticed the following in the ContextModelSnapshot.cs:

b.Property<DateTime>("Created")
                        .HasColumnType("timestamp without time zone");

I've also noticed that although I save someDate.ToUniversaltTime(), it comes back with an unspecified kind.

What's the easiest solution for saving and retrieving UTC date times? What I need is to have it as Kind.UTC when retrieving it from the database.

I've been reading here http://www.npgsql.org/doc/types/datetime.html but there's no code example and I don't really understand where I'm supposed to set NpgsqlDbType.TimestampTz, to what I'm supposed to set it or even if this is the correct way.
I use Npgsql.EntityFrameworkCore.PostgreSQL exclusively, no SQL queries.