List of days between two dates in typescript

Issue

I try to create a list of days between two days.

I created solution like this:

this.daysBetween = [];
while (dateFrom.getDate() !== dateTo.getDate()+1 ) {
    this.daysBetween.push(this.dateFrom);
    dateFrom.setDate(dateFrom.getDate()+1);
  }

But it works only in 90% cases (if there is month change it doesn't work)

e.g. when I pick dates:

dateFrom: 29 august
dateTo: 30 august 

it prints me days from 29 august till 30 september ignoring 31 august ...

Any ideas how to fix my solution, or maybe there is better one?

EDIT:

My question is different than question suggested, because in my question I have as input two dates

e.g.

let dateFrom = new Date(2018, 9, 29);
let dateTo = new Date(2018, 9, 30);

On suggested duplicate result of this could have been int number 1

My question is how to loop through all days between two dates (dateFrom, dateTo)

Where result of those 2 dates examples (dateFrom, dateTo) would've been list with 2 elements:

Mon Oct 29 2018 00:00:00 GMT+0100
Tue Oct 30 2018 00:00:00 GMT+0100 

Solution

You could calculate the difference in milliseconds, and then convert that into the difference in days.

You can then use this to fill an array with Date objects:

const MS_PER_DAY: number = 1000 x 60 x 60 x 24;
const start: number = dateFrom.getTime();
const end: number = dateTo.getTime();
const daysBetweenDates: number = Math.ceil((end - start) / MS_PER_DAY);

// The days array will contain a Date object for each day between dates (inclusive)
const days: Date[] = Array.from(new Array(daysBetweenDates + 1), 
    (v, i) => new Date(start + (i * MS_PER_DAY)));

Answered By - duncanhall