Nodejs Utililty Methods String to Date Convert

String.prototype.toDate = function() {
    return new Date(this.slice(0,15));
};

String.prototype.toDate = function()
  var date, parts, year, month, day, hours, minutes, seconds, ms;
  if (parts = this.match(/^([0-9]{4})\-([0-9]{2})\-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(\.([0-9]{1,3}))?(Z|([-+0-9:]{6}))$/))
    date = Date.parse(this);
    if (isNaN(date)) 
      year    = parts[1];
...

String.prototype.toDate = () =>{
    var from = $(this).val().split("/");
    var f = new Date(from[2], from[1] - 1, from[0]);
    return f;

String.THROW_WHEN_INVALID_DATE = true
String.prototype.toDate = function(dateIsOmittable, monthIsOmittable) {
    var date = null;
    var str = "0000-00-00";
    if (/^\d{4}-\d{2}-\d{2}$/.test(this))
        str = new String(this);
    else if (dateIsOmittable && /^\d{4}-\d{2}$/.test(this))
        str = this + "-01";
    else if (dateIsOmittable && monthIsOmittable && /^\d{4}$/.test(this))
...

String.prototype.toDate = function (pattern = 'YYYY-MM-DD') {
    let date = new Date()
    if (pattern.indexOf("YYYY") > -1) {
        const yearIndex = pattern.indexOf("YYYY")
        date.setFullYear(this.substring(yearIndex,yearIndex+4))
    if(pattern.indexOf("MM")>-1){
        const monthIndex = pattern.indexOf("MM")
        date.setMonth(this.substring(monthIndex,monthIndex+2)-1)
...

String.prototype.toDate = function(str) {
    var m = this.match(/(\d+)-(\d+)-(\d+)\s+(\d+):(\d+):(\d+)/);
    return new Date(+m[1], +m[2] - 1, +m[3], +m[4], +m[5], +m[6]);

String.prototype.toDateFormat = function (format) {
    return this.parseToDate().toDateFormat(format);
};

if (!window.console) {
    console = {
        log: function (msg) {
    };
};
String.prototype.toDateFromAspNet = function () {
    var dte = eval("new " + this.replace(/\
    dte.setMinutes(dte.getMinutes() - dte.getTimezoneOffset());
...

String.prototype.toDateFromAspNet = function () {
    var dte = eval("new " + this.replace(/\
    dte.setMinutes(dte.getMinutes() - dte.getTimezoneOffset());
    return dte;
};

String.prototype.getDate = function() {
    return this.toDate().getDate();