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Business Days

npm install business-days

var bd = require('business-days');
var day = new Date(2013, 8, 20); // Fri 9/20/13 
var nextBusinessDay = bd(1, day.getFullYear(), day.getMonth(), day.getDate());
console.log(nextBusinessDay.toISOString()); // 2013-09-23T07:00:00.000Z (a Monday) 

Negative time works, and if you can also call bd with one arg and that will assume you mean today as a reference.