update problem - Mailing list pgsql-novice

How can I update several columns in one UPDATE query ?
The users's guide says:
UPDATE table SET col = expression [, ...]
    [ FROM fromlist ]
    [ WHERE condition ]

CREATE TABLE time(
orderdate date,
day char(10),
month char(10),
year integer
);

UPDATE timed SET month='january' where month='1' and set month='feb' where month = '2';
ERROR:  parser: parse error at or near "month"

thanks
sudharshan

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Sudharshan Reddy G
Masters of Computer Science,
Victoria University Of Willington,
Willington-6004
NewZealand