John Tortorella’s obligation is to coach the team he has, not the team he used to have or the team he wishes he had.

The 2011-12 Rangers ceased to exist more than a year ago. It is a waste of time, energy and of the future to pine for them or attempt to recreate them.

Yesterday’s gone.

It’s time to start thinking about tomorrow, about how to draw the best out of Chris Kreider, J.T. Miller, Ryan McDonagh and John Moore, about how to maximize Derick Brassard’s talent, about how to get more out of Rick Nash; about how to transform the Rangers into an attack team without sacrificing the basic principles of strong defense necessary to win in any sport.

Again: The Blueshirts just could not match up physically with the Bruins in the Eastern Conference semifinal five-game defeat that put the lid on the season, but they had their best moments in open ice, creating on the rush ... when, that is, they were able to coherently clear the zone.

All season, even right from the start when Nash, Marian Gaborik and Brad Richards were all here in body and soul, the Rangers identified themselves as a shot-blocking team at one end and a forechecking team at the other end that would do its best work below the hash marks.

But that was never true. The Rangers were a talent-driven team. Their identity had changed but the indoctrinated athletes could not bring themselves to acknowledge that, much less embrace it.

Gaborik was asked to move to left wing and then he was asked to move out of town. Richards simply could not find his game before finding himself in the press box for the final two matches of the playoffs — and most likely his Rangers career — in what he and his legion of friends around the industry have interpreted as an unforgivable insult.

And Nash, well, he had a very good season, but how dispiriting was it to watch him being taunted by Milan Lucic without responding after being knocked down and shoved in a pair of incidents over the final minutes of Saturday’s elimination game?