AngularJS UTC to Local Time Filter

In a previous post I detailed how to to implement the UTC time to local time conversion in Vanilla JS. Now let's take it a step further and utilize it in an AngularJS application. The best path forward will be to create a filter which will format the string being rendered. The end result will allow us to do something like the following:

<div class="row" ng-repeat="time in viewModel.times">
  <div class="col-md-6">
    <time datetime="{{time}}">{{ time | utctolocal }}</time>
  </div>
</div>

Basic usage is thus: create the filter, add the script tag to load the filter, add the module to be a dependency on the app.

angular.module('intPonfilters', [])
 .filter('utctolocal', function () {

 var LeadingZero = function (val) {
  return (val < 10) ? "0" + val : val;
 },
 ToDateString = function (dateObj, dateFormat) {
  var curr_year = dateObj.getFullYear(),
   curr_month = LeadingZero(dateObj.getMonth() + 1),
   curr_date = LeadingZero(dateObj.getDate()),
   curr_hour = LeadingZero(dateObj.getHours()),
   curr_min = LeadingZero(dateObj.getMinutes()),
   curr_sec = LeadingZero(dateObj.getSeconds()),
   curr_ampm = "AM";
  if (curr_hour > 11) {
   curr_ampm = "PM";
   curr_hour = (curr_hour == 12) ? 12 : curr_hour - 12;
  }
    var timestamp = curr_year + "-" + curr_month + "-" + curr_date + " " + curr_hour + ":" + curr_min + ":" + curr_sec + " " + curr_ampm + " " + LocalTimeZone();
  return timestamp;
 },
  LocalTimeZone = function() {
    // From http://stackoverflow.com/questions/2897478/get-client-timezone-not-gmt-offset-amount-in-js
    var now = new Date().toString(),
        timezone = now.indexOf('(') > -1 ?
          //now.match(/\([^\)]+\)/)[0] :  // Uncomment this line to return the full time zone text
          now.match(/\([^\)]+\)/)[0].match(/[A-Z]/g).join('') :  // Uncomment this line to return the full time zone abbreviation
          now.match(/[A-Z]{3,4}/)[0];
    if (timezone == "GMT" && /(GMT\W*\d{4})/.test(now))
      timezone = RegExp.$1;
    return timezone;
  };

 return function (input) {
  var inputDate = new Date(input);
  var dateString = ToDateString(inputDate);
  return dateString;
 };
});

An example can be found in my UTCtoLocalAngularJS GitHub repository.