Suppose you could time-travel: say, 20, or 30, or 50 years ahead… What currency should you take for the journey? Dollars, euros, rubles ...or, perhaps, gold? Positively gold. Nobody knows where dollar or euro will be tomorrow. Or, come to that, whether they will still be. Gold is the one that has been retaining its value unchanged for the recent six thousand years. It is this timeless value of gold that the calendar reminds about. As long as you have gold, dates, years, or even centuries are irrelevant. Month is all you need to know to dress for the weather.