function ts() {
  date +%Y-%m-%d_%H:%M:%S
}

function check_ssl {
  if [[ -z "$1" ]]; then
    printf 'usage:\n\ncheck_ssl SITE <port>\n' >&2
    return 1
  else
    site="$1"
  fi
  if [[ -z "$2" ]]; then
    port=443
  else
    port="$2"
  fi
  echo | openssl s_client -showcerts -servername "$site" -connect "$site":"$port" 2>/dev/null | openssl x509 -inform pem -noout -text
}