PL/PGSQL

Hello everybody,

I'm Jordi from Spain, I'm new on this mailing list. I hope I could help anybody in the future but now I new some help because I read a lot of documentation but I can't find an answer.

I have two  questions:

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1.- Exception throwed by cast('yyyymmdd' as timestamp)

I do a cast conversion from a string to a timestamp. When I put a bad date on the string, the cast throw an error on my PL/PGSQL but I can't capture (I'm new). Which type of exception launch the cast function?

I put a exception space on my function but I don't know which exception I have ti capture:

EXCEPTION
WHEN exception_name  THEN
    statements;

Which exception _name I have to write on my code?
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2.- Number of days on February

I'm parsing a string with a date with format 'yyyymmdd' for testing if it's a valid date.

I need to know if the day is correct for the month on the string, but February is different for every year. How can I know if February have 28 or 29 days depending on the year?

Thanks everybody and hello from a new user ;-)