def get_date():
    try:
        d = "Unknown"
        fh = urllib.request.urlopen("http://www.bankofcanada.ca/en/markets/csv/exchange_eng.csv").read()

        for line in fh:
            line = line.strip()

            if not line or line.startsWith(("#", "Closing")):
                continue

            fields = line.split(",")
            if line.startsWith("Date"):
                d = fields[-1]
            else:
                try:
                    value = float(fields[-1])
                    rates[fields[0]] = value
                except ValueError:
                    pass
        return "Exchange rates date: " + d
    except Exception as e:
        return "Failed to download:\n%s" % e