What is the best way to initialize a JavaScript Date to midnight?

The setHours method can take optional minutes, seconds and ms arguments, for example:

var d = new Date();
d.setHours(0,0,0,0);

That will set the time to 00:00:00.000 of your current timezone, if you want to work in UTC time, you can use the setUTCHours method.

Just wanted to clarify that the snippet from accepted answer gives the nearest midnight in the past:

var d = new Date();
d.setHours(0,0,0,0); // last midnight

If you want to get the nearest midnight in future, use the following code:

var d = new Date();
d.setHours(24,0,0,0); // next midnight

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