Life in a Day cameras roll worldwide

Births, weddings, deaths and everything in between are the events YouTube is hoping filmmakers from around the world will document on Saturday.

The video-sharing site has teamed up with Oscar-nominated director Ridley Scott and the Sundance Film Festival to create a feature documentary called Life in a Day.

Anyone with access to video-making equipment — be it a cellphone or a high-definition camera — is invited to film something of their day on Saturday, July 24.

"Really think about why that sunrise makes you happy or why that sunset makes you sad," states Scott in a video promoting what YouTube calls the first ever user-generated feature film project.

"If you want to be a filmmaker, nothing should put you off, and nothing should put you down … Just do it."

Director Kevin Macdonald, who helmed The Last King of Scotland and State of Play, will review the contributions with a team of editors.

The film will then be produced, under Scott's supervision, and launched at the 2011 Sundance Film Festival in Utah in January. It will also be available on YouTube.

Anyone whose footage is chosen for the film will be listed as co-director, and 20 of the co-directors will be selected to attend the film festival premiere. 

"This is a unique experiment in social filmmaking … A time capsule that will tell generations what it was like to be alive on July 24, 2010," noted MacDonald on YouTube's Life in a Day channel.

Filmmakers have until July 31 to upload their footage.