NBC today announced its new mid-season 2012 schedule which features the premieres of four new series in Smash (February 6), The Firm (two-hour premiere January 8, time slot premiere January 12), Fashion Star (March 13) and Are You There, Chelsea? (January 11). The new lineup also includes the return of The Voice, 30 Rock, The Celebrity Apprentice and Who Do You Think You Are?

In addition, there are day and time period changes for Whitney, Up All Night, Rock Center with Brian Williams and Harry's Law

Following are night-by-night details:

Mondays:

Last spring's hit vocal competition series The Voice returns even louder with an hour-long season debut following Super Bowl XLVI on Sunday, February 5 (10-11 p.m. ET, time approximate) and then resumes in its regular day and time on Monday, February 6 (8-10 p.m. ET). Following The Voice is the much-anticipated musical drama Smash, which premieres Monday, February 6 (10-11 p.m. ET).

Tuesdays:

Fashion Star, the new reality competition series hosted and executive-produced by Elle Macpherson, will premiere with a two-hour episode on Tuesday, March 13 (9-11 p.m. ET) and resume on Tuesday, March 20 (10-11 p.m. ET). The Biggest Loser will open a new edition on Tuesday, January 3 (8-10 p.m. ET) followed by Parenthood (10-11 p.m. ET) which continues through its season finale on February 28.

Wednesdays:

The freshman comedy Whitney (8-8:30 p.m. ET) moves into a new day and time beginning January 11 followed by the series debut of the new comedy Are You There, Chelsea? (8:30-9 p.m. ET) on January 11. Rock Center with Brian Williams (9-10 p.m. ET) also joins the Wednesday lineup starting February 8. Law and Order: Special Victims Unit remains at 10-11 p.m. (ET).

Thursdays:

The new drama The Firm moves into the Thursday lineup (10-11 p.m. ET) beginning January 12 following its two-hour premiere the previous Sunday (January 8) from 9-11 p.m. ET. The first-season comedy Up All Night will also move to Thursday nights at 9:30 p.m. (ET) on January 12 which is also the night that multiple Emmy Award-winning 30 Rock returns for its season debut (8-8:30 p.m. ET). Parks and Recreation (8:30-9 p.m. ET) and the Emmy-winning The Office (9-9:30 p.m. ET) remain in the same time periods.

Fridays:

The returning series Who Do You Think You Are? makes its season debut on February 3 (8-9 p.m. ET). Chuck will have its two-hour series finale on January 27th (8-10 p.m. ET). Grimm (9-10 p.m. ET) and Dateline NBC (10-11 p.m. ET) remain in the respective time periods.

Sundays:

The Celebrity Apprentice returns on Sunday, February 12 (9-11 p.m. ET). Dateline NBC begins on Sundays (7-9 p.m. ET), on January 8. Harry's Law moves to the 8-9 p.m. (ET) time period on March 4 and Dateline NBC will return to 7-8 p.m. (ET) on March 4.

The premieres of the new January-March program schedule follow in a grid (all times ET); new series are capitalized.

MONDAYS

  • 8-10 p.m. -- The Voice (season premiere Sunday, February 5; series resumes February 6)
  • 10-11 p.m. - Smash (beginning February 6)

TUESDAYS

  • 8-10 p.m. -- The Biggest Loser (beginning January 3)
  • 10-11 p.m. - Parenthood (through February 28)
  • 10-11 p.m. - Fashion Star (beginning Tuesday, March 13, 9-11 p.m. ET with two-hour premiere; one-hour broadcasts resume March 20)

WEDNESDAYS

  • 8-8:30 p.m. - Whitney (beginning January 11)
  • 8:30-9 p.m. - Are You There, Chelsea? (beginning January 11)
  • 9-10 p.m. - Rock Center with Brian Williams (beginning February 8)
  • 10-11 p.m. - Law and Order: Special Victims Unit

THURSDAYS

FRIDAYS

SATURDAYS

SUNDAYS