从特定日期的半小时列表中排除特定的半小时

I am working on an appointment booking system, and there is a form that collects start date and end date from the user to check the consultant availability, lets suppose if you select start date as March 27 and end date as March 29 which are three days then i am displaying three rows and each row contains the operating hours of an office with half hour interval to book a meeting and this is how it looks like. I am working on an appointment booking system,