Thank you for the information I guess it boils down to b) Microsoft timezone is incorrect or d) The Microsoft timezone [(GMT -4:00) Manaus - Central Brazilian Standard Time] does not correspond to the Olson's America/Manaus timezone -Alain _____ From: Rodrigo Severo [mailto:rodrigo@fabricadeideias.com] Sent: Wednesday, December 09, 2009 12:21 PM To: tz@lecserver.nci.nih.gov Subject: Re: Question regarding America/Manaus timezone On Wed, Dec 9, 2009 at 12:44 PM, Alain Petit <HYPERLINK "mailto:alain.petit@oracle.com"alain.petit@oracle.com> wrote: So either a) I do not interpret the timezone rules properly for America/Manaus, and there is a DST being observed there. If so, please let me know how I should read the above rules/timezone information. b) Microsoft timezone is incorrect c) Olson data is incorrect d) The Microsoft timezone [(GMT -4:00) Manaus - Central Brazilian Standard Time] does not correspond to the Olson's America/Manaus timezone As far as I know and ON (HYPERLINK "http://www.on.br"Observatório Nacional - Brazilian Official Timekeeper) states (see:HYPERLINK "http://pcdsh01.on.br/Fusbr.htm" Brazilian Official Time Map out side of DST period and HYPERLINK "http://pcdsh01.on.br/FusoBR_HVCorrente.htm"Brazillian Official Time Map during DST period) Olson data is correct and there is no DST in Manaus since 1994. Regards, Rodrigo Severo -- --------------------------------------------------------------------------------------- Rodrigo Severo Fábrica de Idéias SBS Quadra 2 - Bloco S - Ed. Empire Center - Sala 1.301 Brasília - DF - CEP 70070-904 Tel. (61) 3321-1357 Fax (61) 3223-1712 ---------------------------------------------------------------------------------------