Question: When was the Dutch kickboxing trainer associated with the Golden Glory gym in Breda born under whom Stefan "Blitz" Leko fights out of Team Golden Glory in Breda?

Context paragraphs:
Golden Glory: Golden Glory was a Muay Thai, kickboxing, and mixed martial arts camp and management team, based in the Netherlands.

Fatih Kocamis: Fatih Kocamis (Turkish "Fatih Kocamış") is a German/Turkish retired mixed martial artist and kickboxer who fought in Pride Fighting Championships, RINGS, K-1 and M-1 Global.  He trained with the Golden Glory team, alongside Chalid Arrab, Stefan Leko and Alistair Overeem.

Davit Kiria: Davit Kiria (Georgian: დავით ქირია ) (born February 9, 1988), also spelled as David Kyria, is a Georgian kickboxer who competes in the middleweight division.  An Ashihara karate stylist, Kiria is known for mixing crisp boxing with unorthodox kicking techniques.  He won the 2009 Kyokushinkai Karate Kamakura European Championship and also built up experience on the Dutch kickboxing scene before joining the Glory promotion in 2011 where he has faced some of the top fighters in his weight class and won the Glory Lightweight Championship in Zagreb (Glory 14), on March 8, 2014.

Thom Harinck: Thom Harinck (born 22 December 1943 in The Hague) is a Dutch kickboxing trainer and founder of the Chakuriki Gym in Amsterdam.  He is married to Marjan Olfers, former member of the board of Ajax and from 1 May 2012 professor in sports law.

Mejiro Gym: Mejiro Gym is a kickboxing gym headquartered in Amsterdam, the Netherlands.  The gym is considered the "birthplace" of Dutch kickboxing.

Stefan Leko: Stefan "Blitz" Leko (born June 3, 1974) is a Croatian-German heavyweight kickboxer.  He is the current WKA Super-Heavyweight world champion in kickboxing, and former Muay Thai world heavyweight champion and Kickboxing world super-heavyweight champion, WMTA, WKN, IKBO, IKBF and WKA world champion, K-1 European Grand Prix 1998 champion, 1999 K-1 Dream champion and two time K-1 World Grand Prix in Las Vegas tournament champion.  He fights out of Team Golden Glory in Breda, Netherlands under Cor Hemmers.  Since 2011 Stefan Leko is coached and managed by Tom Trautsch and won two Heavyweight World Champion Titles.

Darren Curovic: Darren Curovic (born November 19, 1966) is a Western Australian kickboxing fight promoter, a kickboxing trainer, former coach of the Australian national kickboxing team and a former Australian kickboxing representative.

Aziz Jahjah: Aziz "Boutahar" Jahjah (Arabic: زيز جهجه; born April 25, 1980 in Roosendaal, Netherlands) is a Belgian-Moroccan super heavyweight kickboxer, fighting out of Golden Glory Gym in Breda, Netherlands.  He is former WFCA Muay Thai World champion, currently fighting in K-1

Chalid Arrab: Chalid "Die Faust" Arrab (born May 28, 1975) is a German kickboxer and mixed martial artist.  He trains at Team Golden Glory in Breda under Cor Hemmers.

Cor Hemmers: Cornelius "Cor" Hemmers (born August 24, 1956 in Breda) is a Dutch kickboxing trainer associated with the Golden Glory gym in Breda, Netherlands.

Supporting paragraphs: Stefan Leko Cor Hemmers
Answer: August 24, 1956