If you're using PHP
$start = new DateTime('1-1-2017');
$end = new DateTime('4-1-2017');
split date to 3
result :
array(
array('start'=> 1-1-2017,'end'=>2-1-2017),
array('start'=> 2-1-2017,'end'=>3-1-2017),
array('start'=> 3-1-2017,'end'=>4-1-2017)
);
thanks