LOS ANGELES (thefutoncritic.com) -- NBC will close out the freshman run of "1600 Penn" with additional episodes on March 21 and 28.

The extra originals will air at 8:30/7:30c on said nights (replacing previously announced repeats of "Parks & Recreation"), in addition to its regular 9:30/8:30c airings. In total, all 13 produced episodes will have aired by the month's end.

Earlier today, NBC revealed "Go On" will take over "1600 Penn's" time period beginning April 4.

To recap:

Thursday, March 14
8:00/7:00c - "Community"
8:30/7:30c - "Parks & Recreation"
9:00/8:00c - "The Office"
9:30/8:30c - "1600 Penn"
10:00/9:00c - "Law & Order: SVU" (Repeat)

Thursdays (March 21-March 28)
8:00/7:00c - "Community"*
8:30/7:30c - "1600 Penn" (Special Time)
9:00/8:00c - "The Office" (Repeats)
9:30/8:30c - "1600 Penn"
10:00/9:00c - "Law & Order: SVU" (Repeats)

Thursdays (April 4-April 11)
8:00/7:00c - "Community"
8:30/7:30c - "Parks & Recreation"
9:00/8:00c - "The Office"
9:30/8:30c - "Go On" (New Time Slot)
10:00/9:00c - "Hannibal"

* now scheduled as an original on March 21 and a repeat on March 28

Meanwhile over on Wednesdays, we've learned new episodes of "Dateline NBC" will fill the 8:00/7:00c hour beginning April 3. Current occupant "Whitney" will close its sophomore run with a one-hour season finale on March 27:

Wednesdays (March 13-March 20)
8:00/7:00c - "Whitney"
8:30/7:30c - "Whitney" (Repeats)
9:00/8:00c - "Law & Order: SVU"
10:00/9:00c - "Chicago Fire"

Wednesday, March 27
8:00/7:00c - "Whitney"
8:30/7:30c - "Whitney" (Season Finale - Special Time)
9:00/8:00c - "Law & Order: SVU"
10:00/9:00c - "Chicago Fire"

Wednesdays (April 3-May 15)
8:00/7:00c - "Dateline NBC" (One Hour)
9:00/8:00c - "Law & Order: SVU"
10:00/9:00c - "Chicago Fire"

And finally with newcomer "Ready for Love" being relocated to Tuesdays, Sundays will now be home to regular encores of "The Voice" alongside "All-Star Celebrity Apprentice":

Sundays (March 17-March 24)
7:00/6:00c - "Dateline NBC" (Two Hours)
9:00/8:00c - "All-Star Celebrity Apprentice" (Two Hours)

Sundays (March 31-April 7)
7:00/6:00c - "The Voice" (Encore of Monday's Episode)
9:00/8:00c - "The Voice" (Encore of Tuesday's Episode)
10:00/9:00c - "All-Star Celebrity Apprentice" (One Hour)

Sundays (April 14-May 19)
7:00/6:00c - "The Voice" (Various Encores)
9:00/8:00c - "All-Star Celebrity Apprentice" (Two Hours)