Myujth

Using javascript I need to get the next upcoming date that matches a particular pattern.

The date I need is a Sunday and I can get the next Sunday like this:

const date = new Date();
const diff = date.getDay() - 7;
if (diff > 0) 
 date.setDate(date.getDate() + 6);
 else if (diff < 0) 
 date.setDate(date.getDate() + ((-1) * diff));

console.log(date);

But the Sunday I need to get, is every other Sunday matching the following pattern.

10/20/18
11/03/18
11/17/18
12/01/18
12/15/18

using momentjs it's easy like this:

moment().day(-7) // returns last Sunday
moment().day(0) // returns this Sunday
moment().day(7) // returns next Sunday object
moment().day(14) // returns next+1 Sunday object

http://momentjs.com/docs/#/get-set/day/

if you need a JS Date object:

moment().day(7).toDate()

This is what I came up with using just javascript. There is probably a better more efficient way of doing it.

function getDateArray(start, end = new Date()) 
 const arr = new Array();
 const sd = new Date(start);
 while (sd <= end) 
 const d = new Date(sd);
 const d2 = new Date(d);
 d2.setDate(d2.getDate() + 13);
 const v = d.valueOf();
 const ds1 = d.toDateString();
 const ds2 = d2.toDateString();
 const obj = label: `From: $ds1 To: $ds2`, value: v ;
 arr.push(obj);
 sd.setDate(sd.getDate() + 14);
 
 return arr;


const today = new Date();
getDateArray('08/19/18', today);

I can get the date I need by accessing the last item in the returned array