using 'where' in connection with a time or date

[Silvio S.]

Is it acceptable to use where meaning when/in which? I always avoid it, but as its equivalent usage in Portuguese is so common, I start wondering whether the same mechanism occurs in English. For instance:
In 2003, where we found (… ); Brazil arrived at a moment where things started to (…)... Is that right?
Thanks a lot.

[Mister Micawber]

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It sounds odd to me, and I would not use it in careful writing.
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Native English teacher at Mister Micawber's