to johnh3 :
Yes, many thanks for that and I agree there is something wrong about the way we cannot control the clock settings either as user or root.
However, I think maybe the timezone-data is yet another separate issue to follow up
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to Michiel :
I completely agree with your final comment.
I went ahead with installing the pytz software and it installed correctly. I thought that maybe the OS would pick up on this and use the new data automatically. However its no go - the time remains an hour fast for poor little Mauritius!
So, now I'm not sure if its the 2009n data that's wrong or whether pytz itself is mis-managing it. It all looks awafully complicated and well beyond my comprehension!

I guess, as you say, a bug report is in order here. Now I'll try to work out how to do that.

ikarus