I see your point, but this is a very tricky problem to solve. We do our daily summation of data using UTC time, knowing that this will not be perfect for everyone. I guess we could implement a product setting that would tell our summation engine in what timezone the product is used. This would complicate the creation process which is something we are always hesitant to do.
If you have about the same usage pattern on your software every day this should impact Fridays and Mondays I think. The other days would have roughly the correct daily count seen from your timezone. May i suggest that you switch to week view. This will give you a summation per week and should eliminate the skew you see in the daily data.
I'm sorry i can't be more helpful in this matter.
Have a nice weekend
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