Category "epoch"

How can I convert an integer representing EPOCH time to a timestamp in Athena (Presto)?

I have a table where the datetime is stored as varchar but represents the EPOCH time (e.g. 1556895150). How can I get that value to be recognized as a timestamp

How do you convert epoch time in C#?

How do you convert Unix epoch time into real time in C#? (Epoch beginning 1/1/1970)