using the eikon api with python, i'd like to retrieve the expiry date of expired future contracts. Let me explain: ek.get_data(instruments='Wc1',fields='EXPIR_DATE') successfully gives me the current expiry date of Wc1. This is already great, but I also want to know the expiry date of Wc1 on any given date in the past. Example: the expiry date of Wc1 at 1-aug-2020 was 14-sep-2020. How/where can I input a date or date range in order to get expiry dates?
NB: the related posts on this topic did not help me.