Smithtown town residents have until the end of the month to contribute to the town’s time capsule.

The Smithtown 350 Foundation is collecting letters to add to the time capsule through a template posted on the group’s website, said foundation committee member Maureen Smilow.

Letters addressed to future Smithtown generations can include topics such as what residents like about Smithtown or want to see changed, personal memories or predictions for the future, according to details at smithtown350foundation.org.

“We would like residents to really share their thoughts,” Smilow said. “We’re just really eager and looking for those letters, because that will be a very easy thing to put into the time capsule.”

The time capsule — a 16-by-16-inch stainless steel cube — will have limited space, she said. So far the group has collected photos from events, books written by town historian Brad Harris, essays from middle and high school students and a magnet and Christmas tree ornament commemorating the town’s 350th anniversary this year.

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The top item listed on a community survey to include in the time capsule was an iPhone, Smilow said.

“We’re trying to include items that will be seen as interesting, because when we opened up the time capsule from 1965 we were so disappointed,” she said of the ceremony held in March. “It didn’t tell us anything about what it was like to live in 1965.”

The group plans to bury the time capsule on the front lawn of Town Hall in a ceremony scheduled for March 3, 2016, said Harris, who is also a committee member. It will come with instructions to be opened in 50 years and be topped off by a marker, so future residents know where to find it — a problem for officials this year trying to locate the 1950 time capsule.

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“Hopefully, it will give future residents a bird’s-eye view of what our world is like in 2015, so that when they open it in 2065 they will have a pretty good indication of . . . how it compares to their world,” Harris said.