Refactors date handling to use DateService

Standardizes date manipulation across the application by leveraging the DateService.
This change improves consistency and reduces code duplication by removing redundant date calculations.

src/managers/GridManager.ts

@@ -150,13 +150,13 @@ export class GridManager {
    */
   public navigateNext(): void {
     let nextDate: Date;
-    
+
     switch (this.currentView) {
       case 'week':
         nextDate = this.dateService.addWeeks(this.currentDate, 1);
         break;
       case 'month':
-        nextDate = this.addMonths(this.currentDate, 1);
+        nextDate = this.dateService.addMonths(this.currentDate, 1);
         break;
       case 'day':
         nextDate = this.dateService.addDays(this.currentDate, 1);
@@ -164,30 +164,30 @@ export class GridManager {
       default:
         nextDate = this.dateService.addWeeks(this.currentDate, 1);
     }
-    
+
     this.currentDate = nextDate;
-    
+
     eventBus.emit(CoreEvents.NAVIGATION_COMPLETED, {
       direction: 'next',
       newDate: nextDate,
       periodLabel: this.getCurrentPeriodLabel()
     });
-    
+
     this.render();
   }
-  
+
   /**
    * Navigate to previous period
    */
   public navigatePrevious(): void {
     let prevDate: Date;
-    
+
     switch (this.currentView) {
       case 'week':
         prevDate = this.dateService.addWeeks(this.currentDate, -1);
         break;
       case 'month':
-        prevDate = this.addMonths(this.currentDate, -1);
+        prevDate = this.dateService.addMonths(this.currentDate, -1);
         break;
       case 'day':
         prevDate = this.dateService.addDays(this.currentDate, -1);
@@ -195,15 +195,15 @@ export class GridManager {
       default:
         prevDate = this.dateService.addWeeks(this.currentDate, -1);
     }
-    
+
     this.currentDate = prevDate;
-    
+
     eventBus.emit(CoreEvents.NAVIGATION_COMPLETED, {
       direction: 'previous',
       newDate: prevDate,
       periodLabel: this.getCurrentPeriodLabel()
     });
-    
+
     this.render();
   }
   
@@ -299,35 +299,24 @@ export class GridManager {
     }
   }
 
-  /**
-   * Helper method to add months to a date
-   */
-  private addMonths(date: Date, months: number): Date {
-    const result = new Date(date);
-    result.setMonth(result.getMonth() + months);
-    return result;
-  }
-  
   /**
    * Helper method to get month start
    */
   private getMonthStart(date: Date): Date {
-    const result = new Date(date);
-    result.setDate(1);
-    result.setHours(0, 0, 0, 0);
-    return result;
+    const year = date.getFullYear();
+    const month = date.getMonth();
+    return this.dateService.startOfDay(new Date(year, month, 1));
   }
-  
+
   /**
    * Helper method to get month end
    */
   private getMonthEnd(date: Date): Date {
-    const result = new Date(date);
-    result.setMonth(result.getMonth() + 1, 0);
-    result.setHours(23, 59, 59, 999);
-    return result;
+    const nextMonth = this.dateService.addMonths(date, 1);
+    const firstOfNextMonth = this.getMonthStart(nextMonth);
+    return this.dateService.endOfDay(this.dateService.addDays(firstOfNextMonth, -1));
   }
-  
+
   /**
    * Helper method to get all dates in a month
    */
@@ -335,11 +324,13 @@ export class GridManager {
     const dates: Date[] = [];
     const monthStart = this.getMonthStart(date);
     const monthEnd = this.getMonthEnd(date);
-    
-    for (let d = new Date(monthStart); d <= monthEnd; d.setDate(d.getDate() + 1)) {
-      dates.push(new Date(d));
+
+    const totalDays = Math.ceil((monthEnd.getTime() - monthStart.getTime()) / (1000 * 60 * 60 * 24)) + 1;
+
+    for (let i = 0; i < totalDays; i++) {
+      dates.push(this.dateService.addDays(monthStart, i));
     }
-    
+
     return dates;
   }
 }

src/managers/NavigationManager.ts

@@ -153,14 +153,14 @@ export class NavigationManager {
   }
 
   private navigateToPreviousWeek(): void {
-    this.targetWeek.setDate(this.targetWeek.getDate() - 7);
+    this.targetWeek = this.dateService.addWeeks(this.targetWeek, -1);
     const weekToShow = new Date(this.targetWeek);
     this.animationQueue++;
     this.animateTransition('prev', weekToShow);
   }
 
   private navigateToNextWeek(): void {
-    this.targetWeek.setDate(this.targetWeek.getDate() + 7);
+    this.targetWeek = this.dateService.addWeeks(this.targetWeek, 1);
     const weekToShow = new Date(this.targetWeek);
     this.animationQueue++;
     this.animateTransition('next', weekToShow);