Firebird não reconhece CAST e nem EXTRACT

A query está citada abaixo:
---------------------------------
SELECT IDPONTO,
DATA,
EXTRACT(YEAR FROM (CAST(DATA AS date)) AS ANO,
EXTRACT(MONTH FROM (CAST(DATA AS date)) AS MES,
HORA1,
HORA2,
HORA3,
HORA4
FROM TBPONTO
ORDER BY DATA



Estrutura da tabela TBPONTO:
--------------------------------------
IDPONTO (INTEGER)
DATA (VARCHAR(10))
HORA1 (VARCHAR(5))
HORA2 (VARCHAR(5))
HORA3 (VARCHAR(5))
HORA4 (VARCHAR(5))