how to cast localtimestamp to bigint???

Hi,

I am having a table something like this....

CREATE TABLE(PointId integer, PointName varchar(50),PointType integer,
createtime bigint);

where createtime is the current timestamp when the tuple is inserted.

now how do I insert values into the above table. Is there a way to cast
timestamp to bigint.
Also can anyone suggest as to which date function to use -
CURRENT_TIMESTAMP, LOCALTIMESTAMP, timeofday(), now....

> With Best Regards
> Pradeep Kumar P J
>