Date.parseFrom() permits to parse a string to a JavaScript Date

Date.parseFrom.js

/**
 * Parse a string to a Date
 * @param  {String} strDate
 * @param  {String} format Supported format including YYYY, YY, MM, M, DD, D, with - and / separators
 * @return {Date|Throw} the JS Date object, or throw Error("Invalid Date") if strDate is invalid
 * @compatibility IE9+
 * @example
 * Date.parseFrom("1/10/2017", "MM/DD/YYYY"); // -> new Date(2017,0,10)
 */
Date.parseFrom=function(strDate, format) {
  var year,month,day;
  // find the separators
  var separator=" ";
  if (strDate.indexOf("-") > -1) separator="-";
  else if (strDate.indexOf("/") > -1) separator="/";
  strDate=strDate.split(separator);
  format=format.split(separator);
  format.forEach(function(d,i) {
    switch(d.charAt(0)) {
      case "Y": year=strDate[i]*1; break;
      case "M": month=strDate[i]*1-1; break;
      case "D": day=strDate[i]*1; break;
    }
  });
  if (year===undefined || month===undefined || day===undefined) throw Error('invalid date');
  return new Date(year,month,day);
}