The Samvat year 2066 ended on a cheerful note with the BSE benchmark Sensex closing at an all-time high of 20,893.57 points on heavy capital inflows.The wide-based National Stock Exchange's index Nifty too spurted by 121.30 points to close at record high of 6,281.80 points.On the eve of Diwali, the 30-share benchmark Sensex shot up by 427.83 to 20,893.57, surpassing its previous record closing level of 20,873.33 on 8th January, 2008. The measure was still below an intra-day high of 21,206.77 on 10th January, in the same year.Trading sentiment turned bullish as the US central bank expanded support for the worlds biggest economy and the mega public offering by Coal India gained over 39 percent in its debut trading on Thursday.Easing food inflation was another supporting factor for the market.