EPOCH = UNIX timestamp showing as a number such as 1572838239 meaning Mon, 04 Nov 2019 03:30:28 GMT in Human date
website we normally use to convert: https://www.epochconverter.com/
EXCEL formula (refer to cell A1)
UNIX to Human =(((A1/60)/60)/24)+DATE(1970,1,1)
Human to UNIX =(A1-DATE(1970,1,1))*86400