Date javascript日历的日期格式

我必须在我的网站上添加一个javascript日历。但是日期格式是mm/dd/yy。我想将其更改为yy/mm/dd。我已更改了函数f_tcalGenerDate，但我收到错误“无效日期格式”。如何使用此代码更改格式

function f_tcalParseDate (s_date) {

    var re_date = /^\s*(\d{1,2})\/(\d{1,2})\/(\d{2,4})\s*$/;
    if (!re_date.exec(s_date))
        return alert ("Invalid date: '" + s_date + "'.\nAccepted format is yyyy/mm/dd.")
    var n_day = Number(RegExp.$2),
        n_month = Number(RegExp.$1),
        n_year = Number(RegExp.$3);

    if (n_year < 100)
        n_year += (n_year < this.a_tpl.centyear ? 2000 : 1900);
    if (n_month < 1 || n_month > 12)

        return alert ("Invalid month value: '" + n_month + "'.\nAllowed range is 01-12.");
    var d_numdays = new Date(n_year, n_month, 0);
    if (n_day > d_numdays.getDate())
        return alert("Invalid day of month value: '" + n_day + "'.\nAllowed range for selected month is 01 - " + d_numdays.getDate() + ".");

    return new Date (n_year, n_month - 1, n_day);
}
// date generating function
function f_tcalGenerDate (d_date) {
    return (
         (d_date.getMonth() < 9 ? '0' : '') + (d_date.getMonth() + 1) + "/"
        + (d_date.getDate() < 10 ? '0' : '') + d_date.getDate() + "/"
        + d_date.getFullYear()
    );
}

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将子字符串设置为所需的格式，然后使用Date函数将其设置为有效日期

Date mydate = new Date(mysubstring);