This question is a duplicate (see: How to get current date in jquery?).

By modifying my solution from the other question, I got:

var d = new Date();



var month = d.getMonth()+1;

var day = d.getDate();

var hour = d.getHours();

var minute = d.getMinutes();

var second = d.getSeconds();



var output = d.getFullYear() + '-' +

    ((''+month).length<2 ? '0' : '') + month + '-' +

    ((''+day).length<2 ? '0' : '') + day + ' ' +

    ((''+hour).length<2 ? '0' :'') + hour + ':' +

    ((''+minute).length<2 ? '0' :'') + minute + ':' +

    ((''+second).length<2 ? '0' :'') + second;

See this jsfiddle for a proof: http://jsfiddle.net/nCE9u/3/

You can also enclose it within function (demo is here: http://jsfiddle.net/nCE9u/4/):

function getISODateTime(d){

    // padding function

    var s = function(a,b){return(1e15+a+).slice(-b)};



    // default date parameter

    if (typeof d === 'undefined'){

        d = new Date();

    };



    // return ISO datetime

    return d.getFullYear() + '-' +

        s(d.getMonth()+1,2) + '-' +

        s(d.getDate(),2) + ' ' +

        s(d.getHours(),2) + ':' +

        s(d.getMinutes(),2) + ':' +

        s(d.getSeconds(),2);

}

and use it like that:

getISODateTime(new Date());

or:

getISODateTime(some_other_date);

EDIT: I have added some improvement to the function, as proposed by Ates Goral (also decreased its readability in favour of code comments).