Sorry for my imprecise description and thank you for your answers. I display the bar slider from the StockChart and above that a chart based on "series" in "column" mode. You can see the initial view in the attachment "fullrange.png".
Unwanted time range
As soon as I bring one navigation slider close to the other one (to reduce the time range) the time in the upper area (series) switches to daytime. You can see this behaviour in the attached image "rangereduce.png" (00:00, 06:00, etc.). Here I would like to set the lowest time display range to "day" (1th Dec, 2nd Dec, etc.). I tried to handover no daytime (only date) in my dataSource so that the StockChart might realise not to use any time display but then its defaulted/played at 00:00:00.
Beside of bringing the navigation slider together the switch to unwanted daytime display is also possible by using the mouse wheel on the upper column char.
Auto aggregation depending on displayed range
I assume that works inside the navigation area (where the two silders are) out of the box. I don't have enough data to see that but assume it will work. I seems it doesn't do the calculation in the upper column chart ("series"). The solution here was to add aggregate: "sum" in that "series". Then it works like a charm
Here I ment to filter (remove) dates (not data from the dataSource): If the user has done no actions on a certain date there will be no records for that date in the dataSource and therefore this date should not be dispayed in the "series" with the column bars. The idea here is to display only dates on which the user has done some amount actions (represented by column bars).
I was not aware of the panning/zooming (example) which seems to cover my needs very well. I try to work with that before finding a solution within StockChart.
Thanks and Regards