Nasdaq in New York has set the end of this month as a deadline on a decision on action over its Japanese operations. Its partner in the Japanese venture, the Softbank internet investment group, said it planned talks with Nasdaq in an effort to ensure stability in the market. The Japanese venture was launched in June 2000, just before the big bull market fizzled, and was planned as part of a global trading system that would facilitate dealing stocks 24 hours a day.