I typed in the following code:
new Date().getDate()-1;

The answer i got is 16, which is yesterday's date. This is partly what I want. How do i get javascript to give me prior date as 2015-09-16 midnight?

I need the prior date in that format.

Please advise.

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var d = new Date();
d.setDate (d.getDate () -1);

d now has  the value you want. You use the setDate function
Just fixed a typo in there
isamesAuthor Commented:

Thanks for the query. The result shows as 9/17/2015 12:00:00 AM.

How do I get the date to show as yyyy-mm-dd midnight?
12:00:00 AM is in fact midnight :)

12AM => midnight
12PM => midday

The variable will ALWAYS store the time portion.

Javascript however does not really deal well with displaying dates in different formats... well... not out of the box... and not in the style of C# where you just say .ToString("dd-MMM-yyyy"). If you want to format the date for display, then you can do some calculations on a date, or (since these problems have been elegantly solved many times already) just use a Javascript Date Library such as moment.js. Then you can do something like;
var d = new Date(); 
d.setDate (d.getDate () -1);

var dm = moment(d);
alert( dm.format('YYYY-MM-DD') );

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