Timestamp issue in Reporting API

Timestamp inside actionDetails is in GMT whereas lastActionTimestamp is in IST(my timezone).
Last action timestamp for my visitor is 1537355579 ( IST : Wednesday, 19 September 2018 16:42:59 )
Timestamp of the last action in action details is 1537375379 ( GMT : Wednesday, 19 September 2018 16:42:59 )
Shouldn’t it be consistent i.e. either GMT or IST for both?