Calculating due dates with a given turnaround time
You can install it from npm as follows:
$ npm i duedatecalc
Example code:
const ddc = require('duedatecalc');
const dateOfSubmission = new Date(2019,3,25,22,9,0,0);
const turnaround = 16;
console.log(ddc.dueDateCalculator(dateOfSubmission, turnaround))