Leap Year (2010)

Genre: Comedy | Romance
Tagline: Anna planned to propose to her boyfriend on February 29th. This is not her boyfriend.

Plot: A woman who has an elaborate scheme to propose to her boyfriend on Leap Day, an Irish tradition which occurs every time the date February 29 rolls around, faces a major setback when bad weather threatens to derail her planned trip to Dublin. With the help of an innkeeper, however, her cross-country odyssey just might result in her getting engaged.

http://www.imdb.com/title/tt1216492/
http://en.wikipedia.org/wiki/Leap_Year_(2010_film)