 Once the passed and was assented, a deadline was put in place: the referendum was to be held no later than December 31 , 2017 (and not on May 4, 2016 or May 5, 2017). David Cameron then would announce last February that the referendum was to take place on June 23, 2016. Campaigning began on April 15 , 2016 – just over 2 months before the referendum occurred.
<coherence>  Once the passed and was assented, a deadline was put in place: the referendum was to be held no later than December 31 , 2017 (and not on May 4, 2016 or May 5, 2017). David Cameron then would announce last February that the referendum was to take place on June 23, 2016. Campaigning began on April 15 , 2016 – just over 2 months before the referendum occurred.
 Once the passed and was assented, a deadline was put in place: the referendum was to be held no later than December 31 , with , , 2016 – just over 2 months before the referendum occurred.