js time conversion: timestamp to time string (code)

function formatDate(date, format) {
    if (!format) format = "yyyy-MM-dd HH:mm:ss";
    date = new Date(parseInt(date));
    var dict = {
        "yyyy": date.getFullYear(),
        "M": date.getMonth() + 1,
        "d": date.getDate(),
        "H": date.getHours(),
        "m": date.getMinutes(),
        "s": date.getSeconds(),
        "S": ("" + (date.getMilliseconds() + 1000)).substr(1),
        "MM": ("" + (date.getMonth() + 101)).substr(1),
        "dd": ("" + (date.getDate() + 100)).substr(1),
        "HH": ("" + (date.getHours() + 100)).substr(1),
        "mm": ("" + (date.getMinutes() + 100)).substr(1),
        "ss": ("" + (date.getSeconds() + 100)).substr(1)
    };
    return format.replace(/(y+|M+|d+|H+|s+|m+|S)/g,
    function(a) {
        return dict[a];
    });
}
//日期格式化
function dateformarter(value, rowData, rowIndex) {
    if (!value)
        return "";
    var date = new Date(value);
    var year = date.getFullYear().toString();
    var month = (date.getMonth() + 1);
    var day = date.getDate().toString();
    var hour = date.getHours().toString();
    var minutes = date.getMinutes().toString();
    var seconds = date.getSeconds().toString();
    if (month < 10) {
        month = "0" + month;
    }
    if (day < 10) {
        day = "0" + day;
    }
    if (hour < 10) {
        hour = "0" + hour;
    }
    if (minutes < 10) {
        minutes = "0" + minutes;
    }
    if (seconds < 10) {
        seconds = "0" + seconds;
    }
    if (year == "NaN" || month == "NaN") {
        return "";
    }
    return year + "-" + month + "-" + day + " " + hour + ":" + minutes + ":"
            + seconds;
}