Question: When did the MLB draft in which Hunter Greene was selected second overall begin?

Context paragraphs:
1987 Major League Baseball draft: The Major League Baseball Draft is the process by which Major League Baseball (MLB) teams select athletes to play for their organization.  High school seniors, college juniors and seniors, and anyone who had never played under a professional contract were considered eligible for the draft.  The 1987 MLB Draft took place as a conference call to the Commissioner of Baseball's office in New York from June 2–4.  As opposed to the National Football League Draft which appeared on ESPN, no network aired the MLB Draft.

Hunter Greene (baseball): Christian Hunter Greene (born August 6, 1999) is an American professional baseball pitcher for the Cincinnati Reds organization.  He attended Notre Dame High School in Sherman Oaks, Los Angeles, California.  The Reds selected Greene with the second overall selection of the 2017 Major League Baseball draft.

2015 Major League Baseball draft: The 2015 Major League Baseball (MLB) First-Year Player Draft was held from June 8 through June 10, 2015, to assign amateur baseball players to MLB teams.  The draft order is the reverse order of the 2014 MLB season standings.  As the Diamondbacks finished the 2014 season with the worst record, they had the first overall selection.  In addition, the Houston Astros had the 2nd pick of the 2015 draft, as compensation for failing to sign Brady Aiken, the first overall selection of the 2014 MLB Draft.

List of Nashville Predators draft picks: This is a complete list of ice hockey players who were drafted in the National Hockey League Entry Draft by the Nashville Predators franchise.  It includes every player who was drafted, regardless of whether they played for the team.  David Legwand became the Predators' first amateur draft pick during the 1998 NHL Entry Draft.  Selected second overall, he appeared in one game for the Predators during the 1998–99 season, and joined the team full-time the next season.  As the longest serving Predator, Legwand holds team records for games played, goals, assists, and points.  The Predators selected Brian Finley sixth overall in 1999.  Finley appeared in two games for the Predators during his career, allowing 10 goals in 107 minutes.  Alexander Radulov was the first European selected by the Predators in the first round when he was taken 15th overall in 2004.

Leon Draisaitl: Leon Draisaitl (] ; born 27 October 1995) is a German professional ice hockey forward for the Edmonton Oilers of the National Hockey League (NHL).  Draisaitl grew up playing hockey in Germany until he was selected second overall in the 2012 CHL Import Draft by the Prince Albert Raiders.  After two seasons with the Raiders, he was picked third overall by the Edmonton Oilers in the 2014 NHL Entry Draft.

Barry Beck: Barry David Beck (born June 3, 1957) is a former professional ice hockey player and currently the head coach of the Hong Kong national team.  Beck was selected second overall in both the 1977 NHL Amateur Draft and the 1977 WHA Amateur Draft from the New Westminster Bruins.  Beck helped the Bruins win the 1977 Memorial Cup, and was awarded the Stafford Smythe Memorial Trophy as the Most Valuable Player of the tournament.  He opted to move to the NHL over the WHA, and began his career with the Colorado Rockies.  He also played for the New York Rangers and Los Angeles Kings over the course of his career, and retired in 1990.

Danny Hultzen: Daniel Alexander "Danny" Hultzen (born November 28, 1989) is an American professional baseball pitcher who is currently a free agent.  Hultzen attended the University of Virginia, where he starred for the Virginia Cavaliers baseball team.  He was drafted and selected second overall by the Seattle Mariners in the 2011 MLB draft.

LaMarcus Aldridge: LaMarcus Nurae Aldridge (born July 19, 1985) is an American professional basketball player for the San Antonio Spurs of the National Basketball Association (NBA).  The power forward played college basketball for two seasons at the University of Texas.  Aldridge was selected second overall in the 2006 NBA draft.  After spending nine seasons with the Portland Trail Blazers, he signed with the Spurs in 2015.  He has been selected to four All-NBA teams and is a five-time NBA All-Star.

2017 Major League Baseball draft: The 2017 Major League Baseball (MLB) First-Year Player Draft began on June 12, 2017.  The draft assigned amateur baseball players to MLB teams.  The first 36 picks, including the first round and compensatory picks, were broadcast on MLB Network on June 12, while the remainder of the draft was live streamed on MLB.com on June 13 and 14.

Jabar Westerman: Jabar Akil Westerman (born May 13, 1989) is a Canadian football defensive lineman for the Montreal Alouettes of the Canadian Football League (CFL).  He was selected second overall by the BC Lions in the 2012 CFL Draft and signed with the team on May 28, 2012.  He was ranked as the eighth best player in the Canadian Football League’s Amateur Scouting Bureau final rankings for players eligible in the 2012 CFL Draft.  His brother, Jamaal Westerman, plays for the Winnipeg Blue Bombers.  He played college football with the Eastern Michigan Eagles.  As of February 14, 2017, he joined the Alouettes.

Supporting paragraphs: Hunter Greene (baseball) 2017 Major League Baseball draft
Answer: June 12, 2017