javascript return wrong first date and last dates

Question

I found this code can be used to find the first date and the last date of a current month.

var date = new Date();
var firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0);

Today is 11/1/2018

I used this piece of code for a calendar I am developing for one of my projects. Even though it should return first day of the month as 2018-01-01T18:30:00.000Z it returns the first day as 2017-12-31T18:30:00.000Z and the last date as 2018-01-30T18:30:00.000Z.

But there are 31 days in January. So what is wrong with this code?

I found the code from a stackoverflow question

That is why i have mentioned that question as the link. it does not work. thats the problem — pavithra rox, Jan 11 '18 at 07:45
@mersocarlin Why link the same question that he did in his question? — user4020527, Jan 11 '18 at 07:47

score 5 · Accepted Answer · answered Jan 11 '18 at 07:48

There is nothing wrong with the code. The inconsistency you see here is actually the timezone difference. Your plugin is printing the date in ISO string. To get this string in your own locale, use toLocaleString() on the date objects:

var date = new Date();
var firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0);

console.log(firstDay.toLocaleString());
console.log(lastDay.toLocaleString());

Oh thas was the problem. Thank you so much – pavithra rox Jan 11 '18 at 07:57 — pavithra rox, Jan 11 '18 at 07:57

javascript return wrong first date and last dates

1 Answers1