Example usage of the datepicker widget from https://ng-bootstrap.github.io

<!DOCTYPE html>
<html>

  <head>
  <base href="." />
    <title>ng-bootstrap demo</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" />
    <script src="https://unpkg.com/zone.js@^0.7.2/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js@^0.7.2/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@^0.1.8/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@^0.19.40/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app').catch(console.error.bind(console));
</script>
  </head>

  <body>
  <my-app>loading...</my-app>
  </body>

</html>

var ver = {
    ng: '2.3.1',
    ngRouter: '3.3.1'
  };
  
  System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  map: {

    'app': './src',

    '@angular/core': 'npm:@angular/core@' + ver.ng + '/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common@' + ver.ng + '/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler@' + ver.ng + '/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser@' + ver.ng + '/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@' + ver.ng + '/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http@' + ver.ng + '/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router@' + ver.ngRouter + '/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms@' + ver.ng + '/bundles/forms.umd.js',

    'rxjs': 'npm:rxjs@5.0.0-rc.4',
    'typescript': 'npm:typescript@2.0.10/lib/typescript.js',

    '@ng-bootstrap/ng-bootstrap': 'npm:@ng-bootstrap/ng-bootstrap@1.0.0-alpha.20/bundles/ng-bootstrap.js'
  },
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule);


import { Component, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { JsonpModule } from '@angular/http';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { NgbdDatepickerI18n } from './datepicker-i18n';

@Component({
  selector: 'my-app',
  template: `
    <div class="container-fluid">
    
    <hr>
    <p>
      This is a demo plnkr forked from the <strong>ng-bootstrap</strong> project: Angular powered Bootstrap.
      Visit <a href="https://ng-bootstrap.github.io/" target="_blank">https://ng-bootstrap.github.io</a> for more widgets and demos.
    </p>
    <hr>

    <ngbd-datepicker-i18n></ngbd-datepicker-i18n>
  </div>
  `
})
export class App {
}   

@NgModule({
  imports: [BrowserModule, FormsModule, ReactiveFormsModule, JsonpModule, NgbModule.forRoot()], 
  declarations: [App, NgbdDatepickerI18n]
  bootstrap: [App]
}) 
export class AppModule {}

import {Component, Injectable} from '@angular/core';
import {NgbDatepickerI18n} from '@ng-bootstrap/ng-bootstrap';

const I18N_VALUES = {
  en: {
    weekdays: ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su'],
    months: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
  },
  fr: {
    weekdays: ['Lu', 'Ma', 'Me', 'Je', 'Ve', 'Sa', 'Di'],
    months: ['Jan', 'Fév', 'Mar', 'Avr', 'Mai', 'Juin', 'Juil', 'Aou', 'Sep', 'Oct', 'Nov', 'Déc'],
  }
};

// Define a service holding the language. You probably already have one if your app is i18ned.
@Injectable()
export class I18n {
  language = 'en';
}

// Define custom service providing the months and weekdays translations
@Injectable()
export class CustomDatepickerI18n extends NgbDatepickerI18n {

  constructor(private _i18n: I18n) {
    super();
  }

  getWeekdayShortName(weekday: number): string {
    return I18N_VALUES[this._i18n.language].weekdays[weekday - 1];
  }
  getMonthShortName(month: number): string {
    return I18N_VALUES[this._i18n.language].months[month - 1];
  }
  getMonthFullName(month: number): string {
    return this.getMonthShortName(month);
  }
}

@Component({
  selector: 'ngbd-datepicker-i18n',
  templateUrl: 'src/datepicker-i18n.html',
  providers: [I18n, {provide: NgbDatepickerI18n, useClass: CustomDatepickerI18n}] // define custom NgbDatepickerI18n provider
})
export class NgbdDatepickerI18n {

  model;

  constructor(private _i18n: I18n) {}

  set language(language: string) {
    this._i18n.language = language;
  }

  get language() {
    return this._i18n.language;
  }
}

<div [(ngModel)]="language" ngbRadioGroup>
  <label class="btn btn-primary">
    <input type="radio" value="en"> English
  </label>
  <label class="btn btn-primary">
    <input type="radio" value="fr"> Français
  </label>
</div>
<hr>

<form class="form-inline">
  <div class="form-group">
    <div class="input-group">
      <input class="form-control" placeholder="yyyy-mm-dd"
             name="dp" [(ngModel)]="model" ngbDatepicker #d="ngbDatepicker">
      <div class="input-group-addon" (click)="d.toggle()" >
        <img src="img/calendar-icon.svg" style="width: 1.2rem; height: 1rem; cursor: pointer;"/>
      </div>
    </div>
  </div>
</form>