Add days in a date javascript

Question

I'm trying to add 3 days in a date, like this:

var dat = new Date(2014,9,16);

Thu Oct 16 2014 00:00:00 GMT-0300 (Hora oficial do Brasil)

dat.setDate(19);

Sat Oct 18 2014 23:00:00 GMT-0300 (Hora oficial do Brasil)

Why this not returns this Sat Oct 19 2014 23:00:00 GMT-0300 (Hora oficial do Brasil)?

@rpax I don't think this is a duplicate of that other bug; even if it were, there's a lot of confusion and misinformation in that bug. — Pointy, Mar 20 '14 at 17:09

score 2 · Accepted Answer · answered Mar 20 '14 at 17:13

I believe that the problem has to do with Brazilian daylight savings time rules. At midnight on 19 Oct in the parts of Brasil that do daylight savings time, the clock is set back an hour.

Try this:

var d = new Date(2014, 9, 16);
d.setHours(5); // 5 in the morning
d.setDate(19);
console.log(d);

It must drive Brazilians a little crazy to have the DST cutover happen at midnight.

Jaykumar Patel · Answer 2 · 2014-03-20T17:15:30.413

1

Check this demo jsFiddle

Try this way,

var date = new Date(2014,9,16);        // Get user define Date
date.setDate(date.getDate() + 3);     // add 3 days to user define date
alert(date);

edited Mar 20 '14 at 17:15

answered Mar 20 '14 at 17:07

Jaykumar Patel

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but why wait i show you demo, i accept my type mistake but i do. – Jaykumar Patel Mar 20 '14 at 17:09
OK that's better, but it's still basically the same as what the OP is doing (16 + 3 is 19). – Pointy Mar 20 '14 at 17:10
I tryed this but return the same result : Sat Oct 18 2014 23:00:00 GMT-0300 (Hora oficial do Brasil), instead Sat Oct 19 2014 23:00:00 GMT-0300 (Hora oficial do Brasil) – rayashi Mar 20 '14 at 17:15
ok thank @Pointy to give more minutes now you check it this is work. – Jaykumar Patel Mar 20 '14 at 17:16
@rayashi right, because you're still in Brasil :) – Pointy Mar 20 '14 at 17:16
@rayashi your problem now solve ? – Jaykumar Patel Mar 20 '14 at 17:25

Add days in a date javascript

2 Answers2