Moment.js - get start of day yesterday

I have a JS function that I need to get midnight value.

E,g  (-2 days) given today is 2/26/2014 . My function should return 2014-02-25T00:00:00.000Z
(-3 days) given today is 2/26/2014 . My function should return 2014-02-24T00:00:00.000Z

How can this be done with moment.js or javascript

Thanks for your help
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Julian HansenCommented:
How about this
<script type="text/javascript">
function getISODateString(days)
	var date = new Date();
	date.setUTCDate(date.getDate() + days + 1);
	return date.toISOString();

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SiemensSENAuthor Commented:
Thank you
Julian HansenCommented:
You are welcome - thanks for the points.
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