wrong day is returned in javascript

Asked Jan 18 '19 at 16:21

Active Jan 18 '19 at 16:28

Viewed 46 times

I was building a custom DateTime picker. And I encountered an error when using the getDay function in javascript. It is described as following

var d = new Date();
d.setFullYear(1998,9,17);
var day= d.getDay(); 
console.log(day); //returns day 6(which is day saturday in javascript)

but when I Google 17/09/1998 it returns Thursday(which is day 4). Is Google is returning the wrong value

asked Jan 18 '19 at 16:21

rudra

2

The `.setFullYear()` function takes only one argument. *edit* oh no it doesn't, wow learn something every day – Pointy Jan 18 '19 at 16:22
6

`9` in Javascript is October. `9` everywhere else is September. – Tyler Roper Jan 18 '19 at 16:23
Ah but months are numbered from 0 in all date methods. – Pointy Jan 18 '19 at 16:23
@Pointy the other two are optional if you read it here https://www.w3schools.com/js/js_date_methods_set.asp – rudra Jan 18 '19 at 16:23
1

in javascript month starts from 0 to 11, like @Tyler Roper said... 9 is Oct in JS not Sept – Karthik Ganesan Jan 18 '19 at 16:25
@KarthikGanesan That's really strange since date value (here 17) does *not* start with 0. Not consistent. – Pinke Helga Jan 18 '19 at 16:28
2

@Quasimodo'sclone sometimes I wonder if JavaScript were not deliberately designed to improve Stackoverflow rep scores – Pointy Jan 18 '19 at 16:29
@Quasimodo'sclone check this link... https://softwareengineering.stackexchange.com/a/179286/139504 – Karthik Ganesan Jan 18 '19 at 16:31
@KarthikGanesan even so I would tend to consistently count days from 0 as well. We are programmers and used to do so. – Pinke Helga Jan 18 '19 at 16:33
@Quasimodo'sclone well probably because each month has own date count and validating it won't be that feasible where as list of month is a constant array of 12 values. – Karthik Ganesan Jan 18 '19 at 16:36

0 Answers0