javadbc

What's the equivalent for PostgresSQL 'localtimestamp' in JavaDB - Derby?

Is there something simiar? I have this definition create table xyz ( fecha_alta timestamp NOT NULL DEFAULT localtimestamp, .... ) I tried to execute the same in Derby, but it complains with: Error: Syntax error: Encountered "localtimestamp" at line 3, column 41. What's the equivalent? ...