<P> Since the 2015 -- 16 season , all American college basketball uses a 30 - second shot clock , while Canadian university basketball uses a 24 - second clock . The American women 's game has used a 30 - second clock since the 1970s , but the men 's game did not adopt a shot clock until 1985 . The men 's limit was originally 45 seconds , and was shortened to 35 seconds in 1993 before going to 30 seconds in 2015 . The National Federation of State High School Associations ( NFHS ) , which sets rules for high school basketball in the U.S. , does not mandate the use of a shot clock , instead leaving the choice to use a clock and its duration up to each individual state association . Proposals to adopt a national shot clock for high school basketball have been voted down by the NFHS as recently as 2011 . Currently , eight U.S. states require the use of a shot clock of 30 / 35 seconds in high school competition : California , Maryland , Massachusetts , New York , North Dakota , Rhode Island , South Dakota , and Washington . </P>
<P> Since the 2015 -- 16 season , all American college basketball uses a 30 - second shot clock , while Canadian university basketball uses a 24 - second clock . The American women 's game has used a 30 - second clock since the 1970s , but the men 's game did not adopt a shot clock until 1985 . The men 's limit was originally 45 seconds , and was shortened to 35 seconds in 1993 before going to 30 seconds in 2015 . The National Federation of State High School Associations ( NFHS ) , which sets rules for high school basketball in the U.S. , does not mandate the use of a shot clock , instead leaving the choice to use a clock and its duration up to each individual state association . Proposals to adopt a national shot clock for high school basketball have been voted down by the NFHS as recently as 2011 . Currently , eight U.S. states require the use of a shot clock of 30 / 35 seconds in high school competition : California , Maryland , Massachusetts , New York , North Dakota , Rhode Island , South Dakota , and Washington . </P>
when was the shot clock instituted in college basketball
when was the shot clock instituted in college basketball
Since the 2015 -- 16 season
Since the 2015 -- 16 season