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javascript - Issue with .toISOString() function

Consider the following code HTML + JavaScript:

<!DOCTYPE html>
<html>
<body>

<p id="demo">Click the button to display a date after changing the hours, minutes, and seconds.</p>

<button onclick="myFunction()">Try it</button>
 <script>
 function myFunction()
  {
  var d = new Date();
  d.setHours(0,0,0,0);
  document.write(d + '<br/>');
  document.write('ISO Date '+ d.toISOString() + '<br/>');
  //I want it to be 2013-04-17T00:00:00.000Z
  }
 </script>
</body>
</html>

Output:

Thu Apr 18 2013 00:00:00 GMT+0530 (India Standard Time)
ISO Date 2013-04-17T18:30:00.000Z

Could anyone help on understanding this difference in Date & Time

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var d = new Date();
d.setHours(-12, d.getTimezoneOffset(), 0, 0); //removing the timezone offset and 12 hours
console.log(d.toISOString()); //2013-04-17T00:00:00.000Z

I don't know, why would you need a ISO date a day earlier, but in case it is a typo:

var d = new Date();
d.setHours(0, -d.getTimezoneOffset(), 0, 0); //removing the timezone offset.
console.log(d.toISOString()); //2013-04-18T00:00:00.000Z

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