Question regarding America/Manaus timezone

Brian Inglis Brian.Inglis at
Fri Dec 11 03:56:33 UTC 2009

Alain Petit wrote:

>  From what I understand from the above, America/Manaus does not observe 
> DST ever since Sep 22, 1994.
> However, looking at the Microsoft Timezone definition [Dec 2009 update]
> for (GMT -4:00) Manaus [Central Brazilian Standard Time]
>    the timezone observe DST from 3rd Saturday of October 23:59:59 to 3rd 
> Saturday of February, 23:59:59.

> 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

On Windows systems you can select timezone for Manaus and uncheck
"Automatically adjust for Daylight Savings Time"

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