The creators of 21 Brothers were notified Tuesday by Guinness officials that the film has been declared the longest single shot film.

"It's amazing actually," said Clayton Garrett, the film's screenwriter and one of the actors.

"Ever since we found out this morning I've been floating."

The First World War drama is about the Canadian 21st Battalion from eastern Ontario as it prepares for the 1916 Battle of Flers-Courcelette, part of the bloody Battle of the Somme in France.

It was filmed in April 2011 in Elginburg and premiered at The Screening Room in Kingston, ON last Remembrance Day.

The filmmakers had applied for the film to be declared the longest film shot with a single camera but Guinness named the film the world's longest uncut film.

The world record was set as of July 6.

The decision to make the film in one shot was primarily based on budget.

It was cheaper to shoot in one take and avoid expensive and time consuming editing.

Garrett likened the movie to a play which is performed in one continuous take.

The crew spent about six weeks determining how each scene would be filmed and the cast was presented with the challenge of staying in character for more than an hour and a half.

"We rehearsed it for about the same amount of time it would have taken to shoot it scene-by-scene," Garrett said.

"(Director) Mike (McGuire) yelled action, we started the camera rolling and didn't stop."

It was included in this year's Buffalo International Film Festival. Garrett said the filmmakers are trying to get the movie accepted to film festivals in Hamilton, London, England, and to a festival for one-take films in Croatia.

The world record may help make it easier for the filmmakers to get the movie accepted into film festivals.

"A Canadian war film only has a certain appeal," Garrett said. "With the world record, hopefully that will generate some interest."

The movie is available for rent on video on demand through Rogers, Shaw, Telus, MTS and Sasktel and available through iTunes and Google Play.