The 30-share index, however, immediately slipped to 19,938.01 on profit-booking, still up by 31.60 points, or 0.16 per cent, from yesterday's close.
It touched a high of 20,007.09 by gaining over 100 points in opening trade, led by gains in IT, tech and consumer durables sector stocks.
Similarly, the wide-based National Stock Exchange index Nifty inched up by 3.35 points, or 0.06 per cent, to 6,027.40.
Brokers said sustained buying by funds and retail investors after country's largest software exporter TCS posted 26.7 per cent jump in net profit for the October- December quarter buoyed the trading sentiment here.
Stocks of TCS shot up by 3 per cent to Rs 1,374.35, while Wipro gained 0.67 per cent to Rs 420.70.
Besides, a mixed trend in the Asian region also influenced the sentiment, they said.
Meanwhile in the Asian region, Hong Kong's Hang Seng shed 0.26 per cent, while Japan's Nikkei was up 1.26 per cent in early trade today. The US Dow Jones Industrial Average ended 0.14 per cent higher in yesterday's trade.