SYSDATE in PostgreSQL !?

How can I define a table with columns with sysdate as the default value..

If there is no SYSDATE defined in PostgreSQL , what can I do ?

Any help is appreciated. 


CREATE TABLE channels    (channelID                  NUMBER PRIMARY KEY,name                         VARCHAR2(64) NOT
NULL,status                       INTEGER NOT NULL,remedyID                   VARCHAR2(15) UNIQUE,remedySchemaID
NUMBERdefault 48,remedyLastModified    INTEGER,updateTimeStamp      DATE default (SYSDATE),createTimeStamp       DATE
default(SYSDATE)
 
);


Regards,
Louie Kwan