Build a Website

Hello, im looking for a site that can add days to a certain date. For example: input starting date: 1/1/16 input how many days to add: 14 select region (regions have diferent holydays): region3 Script will return a date: Normal days: 15/1/16 Working days: 17/1/16 Of course it will need a way for me to add holydays spicifiying if it is countrywide or just regions. It can be done using sql database but im open to hear other methods if you like. Just dont hardcode since i need to add multiple years. I dont need styling but you can use bootstrap 3 if you want it to look better. I would like you to implement a datepicker script for example [login to view URL] since im not english native speaker, ask me if you have any technical dificulties or something was hard to understand.