In our feeds from America, FID "TRADE_DATE" had value 1602734400 for "15 Oct 2020". This corresponded to GMT: Thursday, October 15, 2020 4:00:00 AM, or Thursday October 15, 2020 00:00:00 (am) EST. However TRADE_DATE of the same feeds from Hong Kong had 1602691200, which corresponded to GMT: Wednesday, October 14, 2020 4:00:00 PM. So what is the logic behind this? What logic should we apply so they're the same in GMT?
Both America and HK uses ELEKTRON EDGE RFA C++ API 8.x.x.