NBC is swapping time periods on Wednesday nights for its two new Fall comedies - 30 Rock and Twenty Good Years - with "30 Rock" now slotted to air one-half-hour earlier from 8-8:30 p.m. (ET) while "Twenty" will be telecast from 8:30-9 p.m. (ET). In addition, the series premieres of both "Twenty Good Years" and "30 Rock" are now scheduled for Wednesday, October 11.

"We have the luxury of starting Wednesdays with either of two great new comedies," said Kevin Reilly, President, NBC Entertainment. "We ultimately felt that this change creates better audience flow throughout the night, with 'Twenty Good Years' a more compatible lead-in to The Biggest Loser at 9 p.m. Either way, we can't wait to get started with these terrific programs."

As part of NBC's planned staggered Fall series rollout, "Twenty Good Years" had previously been announced to debut on Wednesday, October 4 with back-to-back episodes at 8-8:30 p.m. (ET) and 8:30-9 p.m. (ET). "30 Rock" had already been set to premiere on October 11.