Michael : I change my query to this : SELECT CAST( '2006-08-01' AS DATE ) + FP.carencia + ( FP.prazo * ( MFP.parcela - 1 )) AS vencimento FROM fi_mov_formas_pagamento MFP LEFT OUTER JOIN fi_formas_pagamento FP ON ( MFP.idformapagamento = FP.idformapagamento AND MFP.idempresa = FP.idempresa ) INNER JOIN hd_cabecalho HDC ON ( MFP.idmovimento = HDC.idhelpdesk AND MFP.idempresa = HDC.idempresa ) WHERE MFP.idmovimento = 1 AND MFP.idempresa = 1 AND MFP.idtipomovimentacao = 1 And i run ok now. Thanks for your help. Alejandro -->-----Mensagem original----- -->De: Michael Fuhr [mailto:mike@xxxxxxxx] -->Enviada em: terça-feira, 15 de agosto de 2006 22:17 -->Para: Alejandro Michelin Salomon ( Adinet ) -->Cc: Pgsql-General -->Assunto: Re: [GENERAL] How to add days to date --> --> -->On Tue, Aug 15, 2006 at 10:10:27PM -0300, Alejandro Michelin -->Salomon ( Adinet ) wrote: -->> EX : -->> '2006-08-01' + 30 + ( 7 * ( 3 - 1 )) ==> '2006-08-01' + 44 -->> -->> All my trys fails. --> -->The error message hints at what's wrong: --> -->test=> SELECT '2006-08-01' + 30 + (7 * (3 - 1)); -->ERROR: invalid input syntax for integer: "2006-08-01" --> -->PostgreSQL doesn't know that the untyped string is supposed -->to be interpreted as a date. Use a cast: --> -->test=> SELECT '2006-08-01'::date + 30 + (7 * (3 - 1)); --> ?column? -->------------ --> 2006-09-14 -->(1 row) --> -->or --> -->test=> SELECT CAST('2006-08-01' AS date) + 30 + (7 * (3 - 1)); --> ?column? -->------------ --> 2006-09-14 -->(1 row) --> -->-- -->Michael Fuhr -->