Convert an epoch date to human readable format?
If you can get GNU awk on your mac (via homebrew), you can do:

gawk '{print $1, strftime("%Y-%m-%d %H:%M:%S", $2)}'


flavour your datetime formatting to suit.

Otherwise, you can call date from inside awk:

awk '{
    cmd = "date -d \"@" $2 "\" \"+%Y-%m-%d %H:%M:%S\""
    cmd | getline datetime
    close(cmd)
    print $1, datetime
}'


I don't have access to a mac, so you'll need to adjust your date arguments accordingly.