Set date to 7 working days from today (excluding weekends and public holidays)

Question

I\'m trying to set a date to 7 working days from today\'s date (excluding weekends and UK public holidays).

1. I start by setting the default date to today\'s date (t

Answer 1

If you only want to add 7 days and exclude holidays and weekends (assuming Saturday and Sunday), then you can just step from the start to the end and test each day as you go:

var ukHolidays = ['2017-05-12','2017-05-29','2017-08-28','2017-12-25','2017-12-26'];

// Return date string in format YYYY-MM-DD
function getISODate(date){
  function z(n) {return (n<10?'0':'')+n}
  return date.getFullYear() + '-' + z(date.getMonth() + 1) + '-' + z(date.getDate());  
}

// Modifies date by adding 7 days, excluding sat, sun and UK holidays
function add7WorkingDays(date) {
  for (var i=7; i; i--) {
    // Add a day
    date.setDate(date.getDate() + 1);

    // If a weekend or holiday, keep adding until not
    while(!(date.getDay()%6) || ukHolidays.indexOf(getISODate(date)) != -1) {
      date.setDate(date.getDate() + 1);
    }
  }
  return date;
}

// Add 7 working days to today
var d = new Date();
console.log('Add 7 working days to ' + d.toString() + 
            '\nResult: ' + add7WorkingDays(d).toString());