Question: What date was the screenwrither of the film directed by Garry Marshall born on?

Context paragraphs:
Georgia Rule: Georgia Rule is a 2007 American drama film directed by Garry Marshall.  The film stars Lindsay Lohan, Jane Fonda and Felicity Huffman, with supporting cast Dermot Mulroney, Garrett Hedlund and Cary Elwes.  The original music score was composed by John Debney.  The film received generally negative reviews from critics, but the lead cast was praised for their performances.

Marc Silverstein: Marc Silverstein (born July 1, 1971) is an American screenwriter.  His writing partner is Abby Kohn.  They are known for co-writing romantic comedy films such as "Never Been Kissed", "He's Just Not That Into You", "How to Be Single", and the story for "Valentine's Day".  They also co-wrote the romantic drama film "The Vow".  Silverstein is married to actress Busy Philipps, with whom he has two daughters, Birdie and Cricket.

The Flamingo Kid: The Flamingo Kid is a 1984 American comedy film directed by Garry Marshall and written by Marshall, Neal Marshall and Bo Goldman.  It stars Matt Dillon, Richard Crenna, Hector Elizondo, and Janet Jones.  It tells the story of a working class boy who takes a summer job at a beach resort and learns valuable life lessons.  It was the first movie to receive a PG-13 rating, although it was the fifth to be released with that rating, after "Red Dawn", "The Woman in Red", "Dreamscape", and "Dune".

The Princess Diaries (film): The Princess Diaries is a 2001 American comedy film directed by Garry Marshall and written by Gina Wendkos, based on Meg Cabot's 2000 novel of the same name.  It stars Anne Hathaway (in her film debut) as Mia Thermopolis, a teenager who discovers that she is the heir to the throne of the fictional Kingdom of Genovia, ruled by her grandmother Queen Dowager Clarisse Renaldi (Julie Andrews).  The film also stars Heather Matarazzo, Héctor Elizondo, Mandy Moore, and Robert Schwartzman.

Valentine's Day (2010 film): Valentine's Day is a 2010 American romantic comedy film directed by Garry Marshall.  The screenplay and the story were written by Katherine Fugate, Abby Kohn and Marc Silverstein.  The film consists of an ensemble cast led by Jessica Alba, Kathy Bates, Jessica Biel, Bradley Cooper, Eric Dane, Patrick Dempsey, Héctor Elizondo, Jamie Foxx, Jennifer Garner, Topher Grace, Anne Hathaway, Ashton Kutcher, Queen Latifah, Taylor Lautner, George Lopez, Shirley MacLaine, Emma Roberts, Julia Roberts, Carter Jenkins, and Taylor Swift in her film debut.  While the film received negative reviews, it was a major box office success.

Keeping Up with the Steins: Keeping Up with the Steins is a 2006 comedy film directed by Scott Marshall, and starring Garry Marshall, Jeremy Piven, Jami Gertz and Daryl Hannah.  The film is also a commentary on how too many Jewish families see a bar mitzvah or bat mitzvah not as a coming of age for their son or daughter, but rather as an excuse to throw outrageously lavish parties.

The Twilight of the Golds (film): The Twilight of the Golds is a film directed by Ross Kagan Marks, based upon the play "The Twilight of the Golds" by Jonathan Tolins.  The film was screened at the January 1997 Sundance Film Festival prior to its broadcast in March.  The cast included Jennifer Beals as Suzanne, Brendan Fraser as David, Garry Marshall and Faye Dunaway as their parents, and Jon Tenney as Suzanne's husband, with John Schlesinger and Rosie O'Donnell in supporting roles created for the film.

Mother's Day (2016 film): Mother's Day is a 2016 American romantic comedy film directed by Garry Marshall and written by Marshall, Tom Hines, Lily Hollander, Anya Kochoff-Romano and Matt Walker.  It features an ensemble cast, led by Jennifer Aniston, Kate Hudson, Julia Roberts, Jason Sudeikis, Timothy Olyphant, Britt Robertson, Jack Whitehall, Héctor Elizondo and Margo Martindale.  Filming began on August 18, 2015, in Atlanta, Georgia.  It was released in the United States on April 29, 2016, by Open Road Films and grossed $43 million worldwide.

Ronny Hallin: Ronny Hallin (born Ronelle L. Marshall on January 2, 1938) is an American television producer and actress, and sister of Penny Marshall and Garry Marshall, she is best known for her work on the television shows "Happy Days", "Mork & Mindy", and "Step by Step".

The Other Sister: The Other Sister is a 1999 American romantic comedy film directed by Garry Marshall and stars Juliette Lewis, Giovanni Ribisi, Diane Keaton, and Tom Skerritt.  It was filmed in Long Beach, Pasadena, and San Francisco, California.  The film was written by Marshall, Bob Brunner, and Malia Scotch Marmo (uncredited).

Supporting paragraphs: Marc Silverstein Valentine's Day (2010 film)
Answer: July 1, 1971