CURRENT_TIMESTAMP returns the current date and time in the session time zone. The time zone offset identifies the current local time of the session.
TIMESTAMP WITH TIME ZONE
CURRENT_TIMESTAMP [ (precision) ]
precision specifies the fractional second precision of the returned time value. The default value is 6.
CURRENT_TIMESTAMP returns a value such as 08-AUG-06 11.18.31.082257 AM -08:00.
CURRENT_TIMESTAMP(2) returns a value such as 08-AUG-06 11.18.31.08 AM -08:00.