//получаем timestamp
post_date[i] = ParseData(parseInt(data_post.response.items[i].date) * 1000);

//функция ParseData
    function ParseData(date) {
    	var hours = date.getHours();
    	var minutes = date.getMinutes();
    	var seconds = date.getSeconds();
    	var day = date.getDate();
    	var month = dategetMonth();
    	var year = date.getFullYear();
    	return day + "." + month + "." + year + " " + hours + ":" + minutes + ":" + seconds;
    }

var timestamp = 1383256393000;
var date = new Date();
date.setTime(timestamp);
alert( date.getHours() );

date.setTime(timestamp);

date.setTime(timestamp*1000);