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Date function returns the date with a day lesser in firefox

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new Date("10/29/2018") Return output:Date 2018-10-28T18:30:00.000Z

new Date("10/29/2018") Return output:Date 2018-10-28T18:30:00.000Z

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How are you using the command to see the output?

Modified by WestEnd

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Consider time zones. The "Z" in your output indicates GMT time.

As an example of how to get local time, submit this in Firefox's Web Console:

var d=new Date("10/29/2018"); 
console.log('toString() => ' + d.toString()); 
console.log('toISOString() => ' + d.toISOString()); 
console.log('toLocaleString() => '+d.toLocaleString()); 
console.log('toGMTString() => ' + d.toGMTString());

https://developer.mozilla.org/docs/Tools/Web_Console

I get:

toString() => Mon Oct 29 2018 00:00:00 GMT-0700 (Pacific Daylight Time)

toISOString() => 2018-10-29T07:00:00.000Z

toLocaleString() => 10/29/2018, 12:00:00 AM

toGMTString() => Mon, 29 Oct 2018 07:00:00 GMT