feat(): add DateUtil service

app/pages/representation/representation.ts

@@ -1,6 +1,7 @@
 import {Page, NavController, Modal, MenuController} from "ionic-angular/index";
 import {BackendConnector} from "../../services/BackendConnector";
 import {SessionAccessor} from "../../services/SessionAccessor";
+import {DateUtil} from '../../services/DateUtil';
 import {ToTitlePipe} from "../../pipes/ToTitlePipe";
 import {ToIconPipe} from "../../pipes/ToIconPipe";
 import {AsyncDefaultPipe} from "../../pipes/AsyncDefaultPipe";
@@ -10,7 +11,7 @@ import {AfterViewInit} from "angular2/core";
 
 @Page({
   templateUrl: 'build/pages/representation/representation.html',
-  providers: [BackendConnector, SessionAccessor],
+  providers: [BackendConnector, SessionAccessor, DateUtil],
   pipes: [ToTitlePipe, ToIconPipe, AsyncDefaultPipe]
 })
 export class RepresentationPage implements AfterViewInit {
@@ -26,11 +27,12 @@ export class RepresentationPage implements AfterViewInit {
   constructor(private backend: BackendConnector,
               private nav: NavController,
               private session: SessionAccessor,
+              private dateUtil: DateUtil,
               private menu: MenuController) {
 
 
-    this.todayDate = this._getTodayDate();
-    this.tomorrowDate = this._getTomorrowDate();
+    this.todayDate = dateUtil.getTodayDate();
+    this.tomorrowDate = dateUtil.getTomorrowDate();
 
     session.getToken().then((token) => {
       this.todayPromise = backend.sendRepresentationRequest(this.todayDate, token);

app/services/BackendConnector.ts

@@ -1,14 +1,15 @@
 import {Injectable, Inject} from 'angular2/core';
 import {Http, Headers} from "angular2/http";
 import {URLEncoder} from "./URLEncoder";
-import {DateFormatter} from "./DateFormatter";
+import {DateUtil} from "./DateUtil";
 
 @Injectable()
 export class BackendConnector {
 
   private BACKEND_URL = 'https://vpbackend.herokuapp.com';
 
-  constructor(@Inject(Http) private http: Http) {
+  constructor(@Inject(Http) private http: Http,
+              @Inject(DateUtil) private dateUtil: DateUtil) {
 
   }
 
@@ -23,9 +24,9 @@ export class BackendConnector {
     }).map((res) => res.json())
       .toPromise();
   }
-  
+
   sendRepresentationRequest(date: Date, token: string): Promise<any> {
-    return this.http.get(this.BACKEND_URL + '/representation/' + DateFormatter.formatForBackend(date), {
+    return this.http.get(this.BACKEND_URL + '/representation/' + this.dateUtil.formatForBackend(date), {
       headers: new Headers({
         'x-access-token': token
       })

app/services/DateUtil.ts

@@ -0,0 +1,41 @@
+import {Injectable} from 'angular2/core';
+
+@Injectable()
+export class DateUtil {
+
+  formatForBackend(date: Date): string {
+    var month = (date.getMonth() + 1).toString();
+    var day = date.getDate().toString();
+
+    month = month[1] ? month : '0' + month;
+    day = day[1] ? day : '0' + day;
+
+    return `${day}-${month}`;
+  }
+
+   getTodayDate(): Date {
+    let current = new Date();
+    let dayOfWeek = current.getDay();
+    let add = 0;
+
+    if (dayOfWeek === 0) add = -2;
+    else if (dayOfWeek === 6) add = -1;
+
+    current.setDate(current.getDate() + add);
+
+    return current;
+  }
+
+  getTomorrowDate(): Date {
+    let current = new Date();
+    let dayOfWeek = current.getDay();
+    let add = 1;
+
+    if (dayOfWeek === 5) add = 3;
+    else if (dayOfWeek === 6) add = 2;
+
+    current.setDate(current.getDate() + add);
+
+    return current;
+  }
+}