I omitted this setting because our API can deliver values of different time series with different time zones.
This is what the zoomcharts docs say about data source time zones: "This time zone is used to parse time values that do not specify explicit time offset". Since our timestamps contain an offset I thought that might not be a problem.
But I will try this setting. Do I have to inlcude it in the result set of the dataFunction?
Would you recommend that we update our API to only deliver UTC timestamps?