seconds to years or months or days or hours or mintues

function convert_seconds(seconds) {
    var year = Math.floor(seconds / 31536000);
    var day = Math.floor((seconds % 31536000) / 86400);
    var hour = Math.floor(((seconds % 31536000) % 86400) / 3600);
    var minute = Math.floor((((seconds % 31536000) % 86400) % 3600) / 60);
    var second = (((seconds % 31536000) % 86400) % 3600) % 60;
    return year + " years, " + day + " days, " + hour + " hours, " + minute + " minutes, " + second + " seconds";
}