According to NHL on NBC broadcast schedule of the 2008 NHL playoff the conference quarterfinals begin on Saturday, April 12.

Saturday, April 12, 2 p.m. ET
Conference quarterfinals (Game 2)

Sunday, April 13, 2 p.m. ET
Conference quarterfinals (Game 2)

Saturday, April 19, 1 p.m. ET
Conference quarterfinals (Game 6 if necessary)

Sunday, April 20, 3 p.m. ET
Conference quarterfinals (Game 6 if necessary)

Saturday, April 26, 3 p.m. ET
Conference semifinals (Game 2)

Sunday, April 27, 2 p.m. ET
Conference seminfals (Game 2)

Saturday, May 3, 1 p.m. ET
Conference semifinals (Game 5 if necessary)

Sunday, May 4, 2 p.m. ET
Conference semifinals (Game 6 if necessary)

Saturday, May 17, 1:30 p.m. ET
Eastern Conference finals (Game 4)

Sunday, May 18, 3 p.m. ET
Western Conference finals (Game 5 if necessary)

Saturday, May 31, 8 p.m. ET
Stanley Cup Finals (Game 3)

Monday, June 2, 8 p.m. ET
Stanley Cup Finals (Game 4)

Wednesday, June 4, 8 p.m. ET
Stanley Cup Finals (Game 5 if necessary)

Saturday, June 7, 8 p.m. ET
Stanely Cup Finals (Game 6 if necessary)

Monday, June 9, 8 p.m. ET
Stanley Cup Finals (Game 7 if necessary)

Via NBC Sport