Game 7 of the 2015 Atlantic Division semifinal series between the Tampa Bay Lightning and the Detroit Red Wings is Wednesday night at Amalie Arena. This you already know. There's no certainty who is going to come out of that one the victor (though opinions aren't truthful until events unfold and wishful thinking is biased), but we do know as of this afternoon that the winner will be heading to Montreal to face the Canadiens immediately,
Game 1 of the Atlantic Division Finals (or Eastern Conference semifinals if you're still using that scale) is Friday at Bell Centre in Montreal.
The NHL released the schedule for the second round of the playoffs this afternoon, and while there's a variation between the schedule if Tampa Bay advances or Detroit advances, the beginning of the Atlantic Division Final is the same: Friday, May 1st at 7 PM EDT in Montreal. Game two also remains static depending on the winner of Wednesday's game (6 PM on Sunday, May 3rd). It's game 3's date that varies between the opponent Montreal faces. If Tampa Bay is the opponent for Les Habs, game 4 is to be played on Wednesday, May 6th and will also cause the rare playoff event of back-to-back games as the teams go again on Thursday, May 7th. Say thank you or a toss a less placid insult toward the schedule of events at Amalie Arena that causes this necessity.
If the Detroit Red Wings are the team that advances tomorrow, the schedule remain an unbroken every-other-day schedule (May 1st, May 3rd, May 5th, May 7th, May 9th, May 11th) with game 3 played at Joe Louis Arena on Tuesday.
While the dates of May 8th and onward are static, their start times are still to be determined.