plotting - Set fontsize using setoptions not working in DateListPlot

Bug introduced in 10.0.0 and persisting through 11.0.1 or later

I'm trying to use SetOptions to set the global font size for DateListPlot plots. My problem is that this is not working. Even this simple test does not change the font size:

SetOptions[DateListPlot, BaseStyle -> FontSize -> 20];
DateListPlot[{{"2010-10-10", 4.1`}, {"2010-10-17", 8}, {"2010-10-24", 
   5.6`}, {"2010-10-31", 8.6`}}, PlotLabel -> "Test"]

Is there other way to change the predefined fontsize in DateListPlot?

EDIT: I'm using Mathematica 10.0.2.0 in Linux x86 (64-bit)

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