Step in off the ledge, Mets fans.

A 3-6 homestand, while not optimal, has no bearing on the postseason. Neither does a so-so September (record: 12-9).

Getting in is all that counts. Just ask the 2014 Giants, 2006 Cardinals (yikes, we know!), 2001 Diamondbacks and 2000 Yankees (double yikes).

Plus, the Mets aren’t the only contender struggling. The NL West-leading Dodgers just snapped a four-game losing streak. The Cardinals, owners of the best record in baseball, are 11-10 this month after starting out 3-8. The Royals are even worse, at 8-13.

Below is proof that all that matters is getting in:

September record: 12-17

Sorry, Mets fans, it had to be brought up. The Cardinals lost seven straight games in late September and finished the month on a 4-10 skid. They ended up with a meager 83 wins — just 1.5 games ahead of the second-place Astros. Once into October, however, they magically beat the favorites Padres in the NLDS, stunned the Mets in the NLCS in seven grueling games — paging Carlos Beltran — and defeated the Tigers in a five-game World Series. Whenever someone says a team doesn’t belong in the playoffs because of its lackluster record, they invoke the Cardinals.

September record: 13-17

They were dreadful down the stretch, losing 13 of their last 15 games and their final seven, finishing with just 87 wins in claiming the AL East. Yet, once the October lights came on, the Derek Jeter/Mariano Rivera-led Yankees turned it on, beating the A’s in a hard-fought five-game division series, knocking off the Mariners in six games in the ALCS and manhandling the Mets in a five-game Subway Series. Think anyone on that team remembers September?

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September record: 14-13

Everyone remembers the heroics of Curt Schilling and Randy Johnson, but nobody recalls how inconsistent the Diamondbacks were in September. They lost consecutive games four times that month en route to a 92-70 record, edging the Giants by two games in the NL West. But they went 11-6 in the playoffs, including a memorable seven-game World Series against the Yankees.

September record: 13-12

The Giants didn’t collapse like the 2006 Cardinals or 2000 Yankees, but they didn’t play their best baseball in September, either, losing nine of 15 to close the regular season while holding on to win the second NL Wild Card with an 88-74 mark. The rest was a Madison Bumgarner tour de force: San Francisco edged the Pirates, 1-0, in the Wild Card Game, beat the favored Nationals in four games in the NLDS, needed only five games to get by the Cardinals in the NLCS and survived the Royals in a thrilling World Series Game 7.