tomchuk

    def fib(n, cache = {0: 0, 1: 1}):
        if n not in cache:
            cache[n] = fib(n-1) + fib(n-2)
        return cache[n]

  now() {
    cal -3
    echo
    echo -n "Local:       "
    date --rfc-3339=s
    echo -n "UTC:         "
    date -u --rfc-3339=s
    echo -n "New York     "
    TZ='America/New_York' date --rfc-3339=s
    echo -n "London:      "
    TZ='Europe/London' date --rfc-3339=s
    echo -n "New Zealand: "
    TZ='Pacific/Auckland' date --rfc-3339=s
  }