Convert Unix timestamp into datetime

It's because the epoch is not numeric, try converting it into a number and it works like wonder!

try$time <- as.POSIXct(as.numeric(try$time), origin = '1970-01-01', tz = 'GMT')

You have to convert from Factor to Character To Number before using as.POSIXct. The function is expecting an integer as a Unixtime

head(as.POSIXct(as.numeric(as.character(try$time)), origin="1970-01-01", tz="GMT"))