I'm collecting overnight deposit data using get_timeseries_data() method and I want to ask - is given time for overnight data prices (rates) local for issuer or it in UTC time zone?
I think you mean get_timeseries() method. The timezone of this method is GMT/UTC+0. If you would like to use another timezone, please refer to how to get timeseries data for a given timezone and specific captured time and dates in python Eikon API question.
Hope this help.