New! Check out Ionic Native. It's like ngCordova but for ES6 and TypeScript.

$cordovaGlobalization

Obtains information and performs operations specific to the user’s locale and timezone.

cordova plugin add cordova-plugin-globalization
module.controller('MyCtrl', function($cordovaGlobalization) {
  $cordovaGlobalization.getPreferredLanguage().then(
    function(result) {
      // result
    },
    function(error) {
      // error
  });

  $cordovaGlobalization.getLocaleName().then(
    function(result) {
      // result
    },
    function(error) {
      // error
  });

  $cordovaGlobalization.getFirstDayOfWeek().then(
    function(result) {
      // result
    },
    function(error) {
      // error
  });

    // Soon implemented:
    // dateToString
    // stringToDate
    // getDatePattern
    // getDateNames
    // isDayLightSavingsTime
    // numberToString
    // stringToNumber
    // getNumberPattern
    // getCurrencyPattern
});