I was looking at the ISO8601 that talks about the format of string passed as argument to object date .
On this site, the date returned is from yesterday.
I'mpassingthe'2017-08-03'valuetothedateobjectanditreturnsmethedatefromyesterday,see:
data = '2017-08-03'
console.log(new Date(data));Why does not the jsfiddle have a different result?
Wed Aug 02 2017 21:00:00 GMT-0300 (Hora oficial do Brasil)
A quick explanation.
w3schools:
getDay() - Returns the day of the week (from 0-6)
As you can see, it returns 0-6 so this difference you quoted happens.
This happens:
getMonth() - Returns the month (from 0-11)
So always count 0 instead of 1
Confusion happens only when using alert , if we change to console.log everything is right. The difference is that alert calls toString to print the contents of some object, something like this:
data = '2017-08-03'
console.log(new Date(data).toString());
The result will be:
Wed Aug 02 2017 21:00:00 GMT-0300 (Brazil's official time)
Wrong too. But if we invoke toISOString :
2017-08-03T00: 00: 00ZZ
The important thing is that the date object is being created correctly based on string last.