Who wouldn’t like to go back in time and buy whoever decided St. Patrick’s Day should become an official Christian feast day a pint of Guinness? It’s the one time of the year when it is socially acceptable to wear your decades-old Kelly green sweater and shamrock earrings and chug an Irish car bomb. Even cabbage tastes good. Whether you’re Irish, Christian or none of the above, St. Patrick’s Day is a day to celebrate, and many Long Island restaurants agree (so does the Catholic Church. Lent restrictions are lifted that day). Dig that green sweater out of the bottom of your drawer and raise a pint of Guinness or green beer at one of these Long Island St. Patrick’s Day bashes.

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Library Cafe, Farmingdale

Casual and sophisticated, Library Cafe is a perfect spot to celebrate St. Patrick’s Day. image: library cafe

St. Patrick’s Day is a casual holiday, but that doesn’t mean you’re up for a trip to the local dive. Library Cafe, with its high ceilings, large wooden bar and gas lamps, has a bit of unpretentious sophistication, and the approachable pub menu keeps things laid-back. Chase an obligatory shot of Jameson with corned beef mac ‘n cheese and Irish cream cheesecake. The St. Patrick’s Day menu is also available after the Farmingdale St. Patrick’s Day Parade on March 20. Go.

50 Shades of Green Crawl, Freeport

Rachel’s Waterside Grill is one of several Freeport restaurants participating in the 50 Shades of Green Crawl. image: rachel’s waterside grill

Fun fact: March 12 is the new March 17, at least that’s what the folks at the Nautical Mile Merchants Association are saying. Enjoy free and half-priced apps, specialty drinks and of course green beer at your favorite Nautical Mile establishments including Rachel’s Waterside Grill, Tony Cuban’s Cucina and Cocktails, Hurricane Harry’s and Bracco’s Clam and Oyster Bar. Bonus: it’s for a great cause. A portion of the proceeds will be donated to the Cerebral Palsy Association of Nassau County. Cheers to that. Go.

Parlay, Rockville Centre

Get an early start on celebrating March 15 with a four-course beer dinner in a spacious, brick-walled Nassau hotspot complete with a 40-foot bar. Potato leak soup, corned beef and cabbage and chocolate mousse cake pair perfectly with Long Ireland Beer Company brews. Go.

Mirabelle Restaurant & Tavern, Stony Brook

The Hudson is one of the special drinks on Mirabelle’s St. Patrick’s Day menu. image: mirabelle

Dim lights, wooden and brick accents and warm, friendly service give the tavern a casual feel ideal for St. Patrick’s Day. For a white table cloth affair without the snobbery, ask for a table in the dining room next to the fireplace that will keep you warm on a chilly late-winter night. A special three-course menu with offerings like cod and salmon pot pie, Irish lamb stew and Bailey’s panna cotta is exactly what you’d expect from the Stony Brook staple that loves to put twists on classics. Live a little and spring for the beer pairings for an extra $10. Go.

Cannon’s Blackthorn, Rockville Centre

It wouldn’t be St. Patrick’s Day without a pint of beer. image: facebook.com/cannonsblackthorn

Spending St. Patrick’s Day at a pub is a no-brainer, and Cannon’s Blackthorn takes the cake (or apple pie a la mode, which is on the special St. Patrick’s Day menu that includes a Dublin whiskey burger and Guinness beef stew). The cozy booths inside the Irish restaurant, which opened in 1926 as The Olde Blacktorne Inn, are made with hand-crafted furniture imported directly from Ireland, and the corned beef and cabbage with broiled potatoes will put you in a festive mood. If you can’t get there on a Thursday night, the special menu will be available Friday and Saturday. Go.

Oyster Bay Brewing Company, Oyster Bay

Be one of the first to sample Oyster Bay Brewing’s Irish Ale. image: facebook.com/oysterbaybrewing

St. Patrick’s Day is the perfect excuse to check out Oyster Bay Brewing Company’s new 6,000-square foot tasting room. The craft brewery isn’t just toasting to Irish traditions, they’re releasing their Irish Red Ale, so pull up a stool or grab a seat at a high-top table and be one of the first to try. Go.

Milleridge Inn, Jericho

The reopened Milleridge Inn will have a festive St. Patrick’s Day menu.

For an old world charm and an approachable, festive menu, head to the recently re-opened Milleridge Inn. The historic Jericho gem is offering lunch and dinner menus with all the St. Paddy’s Day fixings like fish and chips and corned beef and cabbage. Bagpipers and Irish step dancers will provide live entertainment all day. Go.

Lily Flanagans Pub, Babylon

Lily Flanagans Pub might as well be your one-stop-shop for St. Patrick’s Day. Get your day started with a traditional Irish breakfast, pop in for lunch and take in Irish step dancers and bag pipers and return for dinner, a pint and a live DJ. Go.

Montauk Yacht Club, Montauk

Get to The End for the annual parade and cocktails. image: montauk yacht club

When it comes to Long Island St. Patrick’s Day celebrations, you can argue Montauk does it best. People flock to The End for the Friends of Erin St. Patrick’s Day Parade each year, and this year the festivities are set for March 20. Get there the day before the parade to avoid traffic and head to the Montauk Yacht Club for the annual Friends of Erin Cocktail Party from 4-8pm. Go.

Finnegan’s Restaurant & Tap Room, Huntington

It wouldn’t be St. Patrick’s Day without a perfectly poured pint of Guinness. image: finnegan’s restaurant & tap room

The oldest continually operating bar in Huntington, Finnegan’s Restaurant & Tap Room is a place where if everyone doesn’t know your name, they’ll still welcome you with open arms. Dig into festive Irish fare that pairs oh-so-well with the perfect pints of Guinness GM Tom Forte, often referred to as the “Mayor of Huntington,” and his staff will be pouring all night. Go.

Rowdy Hall, East Hampton

Pop in to one of East Hampton’s favorite watering holes, take a seat at the copper-topped bar or the cozy fireplace and indulge in an Irish mimosa before the big parade in Montauk. Rowdy will have a special prix fixe menu with Irish fare on the 17th. Go.