直接将天数添加到当前日期javascript

Question

I apologize as I'm sure this question has been answered already but there's so many different solutions from different years that my head is just spinning from viewing all the different solutions. But can someone please help with providing a straight forward javascript solution to display (x) days after current date?

All I'm trying to accomplish is having a notice on a page - "We are currently accepting bookings for March XX, 2017 or after" at the top.

OR is there anything I can to the code below to make it add (X) days as I'm using this to show current date.

var MONTH_NAME = ['January', 'Febuary', 'March', 'April', 'May', 'June',
              'July', 'August', 'September', 'October', 'November', 'December'];
function showTime() {
function twoDigit(n) {
    return ('0' + n).slice(-2);
}
function iso8601(date) {
    return date.getFullYear() +
           '-' + twoDigit(1 + date.getMonth()) +
           '-' + twoDigit(date.getDate()) +
           'T' + twoDigit(date.getHours()) +
           ':' + twoDigit(date.getMinutes());
}
function en_US(date) {
    var h = date.getHours() % 12;
    return MONTH_NAME[date.getMonth()] +
           ' '  + date.getDate() +
           ', ' + date.getFullYear();
}

var timeEl = document.getElementById('time');
if (timeEl !== null) {
    var now = new Date();
    timeEl.innerHTML = en_US(now);
    timeDiv.setAttribute('datetime', iso8601(now));
}
};
setInterval(showTime, 1000);

Please and thank you.

Answer 1

You can use setDate and getDate methods to solve your problem. Take a look at addDays method I have written. Hope this helps.

 var MONTH_NAME = ['January', 'Febuary', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December' ]; function showTime() { function twoDigit(n) { return ('0' + n).slice(-2); } function iso8601(date) { return date.getFullYear() + '-' + twoDigit(1 + date.getMonth()) + '-' + twoDigit(date.getDate()) + 'T' + twoDigit(date.getHours()) + ':' + twoDigit(date.getMinutes()); } function en_US(date) { var h = date.getHours() % 12; return MONTH_NAME[date.getMonth()] + ' ' + date.getDate() + ', ' + date.getFullYear(); } function addDays(date, days){ var newDate = new Date(date.getTime()); newDate.setDate(newDate.getDate() + days); return newDate; } var timeEl = document.getElementById('time'); if (timeEl !== null) { var now = new Date(); timeEl.innerHTML = en_US(now) + ' to ' + en_US(addDays(now, 15)); timeEl.setAttribute('datetime', iso8601(now)); } }; setInterval(showTime, 1000); 

 <div id="time"></div>