All the Presidents' Movies The Movie - 2009 was released on:
USA: 2009
USA: 1 February 2009
Back to the Movies - 2009 was released on: USA: 30 January 2009
Movies and Music - 2010 was released on: USA: 5 July 2010
Pruning the Movies - 1915 was released on: USA: 1 January 1915
Richard Roeper and the Movies - 2009 was released on: USA: 2009
Movies for Guys Who Like Movies - 1999 - 3.18 was released on: USA: 3 May 2001
All the Presidents' Movies - 2003 TV was released on: USA: 1 August 2003
Release dates for current movies can be found on AMC, IMDb, Cineplex Odeon, Silver City, Redbox, Empire Online, Fandango, Movie Rewind and Coming Soon.
At the Movies - 1982 Movies We'd Book If We Owned a Movie Theater 1-8 was released on: USA: 13 November 1982
The Screen Junkies Show - 2012 Best Movie Presidents 2-28 was released on: USA: 4 July 2013
One could find movie release dates online by looking to various websites that sell movie tickets and give information on movies. Some examples would be the Internet Movie Database (IMDb), Fandango, and Movie Tickets.
I Was a Teenage Movie Maker Don Glut's Amateur Movies - 2006 was released on: USA: 3 October 2006
Remix the Movies - 2013 Scary Movie 5 Remix - 1.2 was released on: USA: 17 April 2013
Remix the Movies - 2013 Scary Movie 5 Remix 1-2 was released on: USA: 17 April 2013
Hollywood's Top Ten - 2010 Movies About the Movie Biz 1-37 was released on: USA: 18 May 2010
Movie Mob - 2007 The Mob Reviews 'Top 10 Movies of 2007' was released on: USA: 1 January 2008
IMDB.com is a good source. The movies website will usually also have it. Also movie theatres and stores who sell them will as well. (closer to the date)
I recommend checking your local movie theater's schedule or a movie release website for the most up-to-date information on new movies coming out next month. Release dates can vary by location and may change.