NBC says its new U.S. series "Parenthood" and "The Marriage Ref" will help fill the void left when "The Jay Leno Show" goes off the air.

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The network recently announced the 5-night-a-week, prime-time "Leno" won't return after the Winter Olympics. It was canceled due to lackluster ratings after just a few months on the air.

The drama "Parenthood" is to premiere Tuesday, March 2, at 10 p.m. ET, while the comedy panel series "The Marriage Ref" from Jerry Seinfeld is to debut Thursday, March 4, after its sneak preview Feb. 28 following NBC's coverage of the closing ceremony of the Winter Olympics.

"Law & Order" continues its 20th season debuting on a new night with a two-hour telecast March 1 before settling into its regular 10 p.m. time period the following Monday.

"Law & Order: Special Victims Unit" will move to Wednesdays beginning March 3 and new editions of "Dateline NBC" are to run from 9 p.m. to 11 p.m. on Fridays, the network said.