Javascript regex to extract year from string

I'm trying to extract the year from a timestamp using regex, but I'm not very good at it, so my code isn't returning what expected.

that's the string: 'Sun Jan 01 2012 00:00:00 GMT+0000 (GMT)'

I need to extract '2012' here's my code:

var scrollDate = tl.getBand(0).getCenterVisibleDate(); // my timestamp

// regex function
function extractNumbers(str) {
     var m = /(^|\s)(\d{4})(\s|$)/.exec(str);
     return m;

// click event

The alert box returns this: 2012 , ,2012,

What am I doing wrong? Thanks in advance


var x = new Date("Sun Jan 01 2012 00:00:00 GMT+0000 (GMT)");


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