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HTML 

              
                <body ng-app="miApp" ng-controller="controladorTiempo">
 
    <p>{{fecha}}</p>
    <p>{{hora}}</p>
 
</body>

<!-- Más info https://www.guidacode.com/2018/angularjs/como-crear-servicio-en-angularjs/ -->
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CSS
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JS 

              
                var module = angular.module('miApp', []);

/*Cuando la aplicaciones necesite por primera vez el servicio, entonces se llamara a la funcion factory*/
module.factory('saludoService', function () {

var saludoSvc = {};

  /*Al objeto le asignaremos 2 métodos, Obtener fecha y Obtener hora*/
  saludoSvc.getFecha = function () {
    var meses = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio', 'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre'];

    //Obtenemos la fecha de hoy
    var fecha = new Date();

    //El mes a partir del objeto fecha
    var mes = fecha.getMonth();

    //Devolvemos un string que devoverá el día, el mes (en castellano) y el año
    return 'Hoy es ' + fecha.getDate() + ' de ' + meses[mes] + ' del ' + fecha.getFullYear();
  }

  //Esta funcion devolverá la hora
  saludoSvc.getHora = function () {
    return new Date().toTimeString();
  }

  return  saludoSvc;

});

//Ahora en el controlador podremos llamar a nuestro servicio. 
module.controller("controladorTiempo", function ($scope, saludoService) {

  //Llamamos la funciones del servicio y asignamos los valores que devuelven  a la variable $scope para poder sacarlos en la vista
  $scope.fecha = saludoService.getFecha();
  $scope.hora = saludoService.getHora();

});
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