refactor: unify date handling with utility functions

- Replaced direct date manipulations with utility functions like `getToday`, `parseDate`, and `createDateFromParts` across various components and services for consistency.
- Updated date initialization in `JiraAnalyticsService`, `BackupService`, and `DailyClient` to improve clarity and maintainability.
- Enhanced date parsing in forms and API routes to ensure proper handling of date strings.

src/lib/backup-utils.ts

@@ -3,7 +3,7 @@ import { exec } from 'child_process';
 import { promisify } from 'util';
 import path from 'path';
 import { createHash } from 'crypto';
-import { formatDateForDisplay, getToday } from './date-utils';
+import { formatDateForDisplay, getToday, parseDate } from './date-utils';
 
 const execAsync = promisify(exec);
 
@@ -160,7 +160,7 @@ export class BackupUtils {
       // Format: 2025-09-18T14-12-05-737Z -> 2025-09-18T14:12:05.737Z
       const isoString = dateMatch[2]
         .replace(/T(\d{2})-(\d{2})-(\d{2})-(\d{3})Z/, 'T$1:$2:$3.$4Z');
-      date = new Date(isoString);
+      date = parseDate(isoString);
     }
     
     return { type, date };
@@ -170,7 +170,7 @@ export class BackupUtils {
    * Génère un nom de fichier de backup
    */
   static generateBackupFilename(type: 'manual' | 'automatic'): string {
-    const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
+    const timestamp = getToday().toISOString().replace(/[:.]/g, '-');
     return `towercontrol_${type}_${timestamp}.db`;
   }
 

src/lib/date-utils.ts

@@ -117,6 +117,28 @@ export function createDate(date: Date): Date {
   return new Date(date);
 }
 
+/**
+ * Crée une date à partir de composants année/mois/jour
+ */
+export function createDateFromParts(year: number, month: number, day: number): Date {
+  return new Date(year, month - 1, day); // month est 0-indexé en JavaScript
+}
+
+/**
+ * Convertit une date pour un input datetime-local (gestion timezone)
+ */
+export function formatDateForDateTimeInput(date: Date): string {
+  const adjustedDate = new Date(date.getTime() - date.getTimezoneOffset() * 60000);
+  return adjustedDate.toISOString().slice(0, 16);
+}
+
+/**
+ * Parse une valeur d'input datetime-local vers une Date
+ */
+export function parseDateTimeInput(value: string): Date {
+  return new Date(value);
+}
+
 /**
  * Ajoute des jours à une date
  */
@@ -126,6 +148,15 @@ export function addDays(date: Date, days: number): Date {
   return result;
 }
 
+/**
+ * Ajoute des minutes à une date
+ */
+export function addMinutes(date: Date, minutes: number): Date {
+  const result = createDate(date);
+  result.setMinutes(result.getMinutes() + minutes);
+  return result;
+}
+
 /**
  * Soustrait des jours à une date
  */

src/lib/jira-period-filter.ts

@@ -1,4 +1,5 @@
 import { JiraAnalytics } from './types';
+import { getToday, subtractDays, parseDate } from './date-utils';
 
 export type PeriodFilter = '7d' | '30d' | '3m' | 'current';
 
@@ -9,18 +10,18 @@ export function filterAnalyticsByPeriod(
   analytics: JiraAnalytics, 
   period: PeriodFilter
 ): JiraAnalytics {
-  const now = new Date();
+  const now = getToday();
   let cutoffDate: Date;
 
   switch (period) {
     case '7d':
-      cutoffDate = new Date(now.getTime() - (7 * 24 * 60 * 60 * 1000));
+      cutoffDate = subtractDays(now, 7);
       break;
     case '30d':
-      cutoffDate = new Date(now.getTime() - (30 * 24 * 60 * 60 * 1000));
+      cutoffDate = subtractDays(now, 30);
       break;
     case '3m':
-      cutoffDate = new Date(now.getTime() - (90 * 24 * 60 * 60 * 1000));
+      cutoffDate = subtractDays(now, 90);
       break;
     case 'current':
     default:
@@ -56,7 +57,7 @@ function filterCurrentSprintAnalytics(analytics: JiraAnalytics): JiraAnalytics {
 function filterAnalyticsByDate(analytics: JiraAnalytics, cutoffDate: Date): JiraAnalytics {
   // Filtrer l'historique des sprints
   const filteredSprintHistory = analytics.velocityMetrics.sprintHistory.filter(sprint => {
-    const sprintEndDate = new Date(sprint.endDate);
+    const sprintEndDate = parseDate(sprint.endDate);
     return sprintEndDate >= cutoffDate;
   });
 

src/lib/sort-config.ts

@@ -151,22 +151,22 @@ function compareTasksByField(a: Task, b: Task, sortConfig: SortConfig): number {
       
     case 'createdAt':
       return compareValues(
-        new Date(a.createdAt).getTime(),
-        new Date(b.createdAt).getTime(),
+        a.createdAt.getTime(),
+        b.createdAt.getTime(),
         direction
       );
       
     case 'updatedAt':
       return compareValues(
-        new Date(a.updatedAt).getTime(),
-        new Date(b.updatedAt).getTime(),
+        a.updatedAt.getTime(),
+        b.updatedAt.getTime(),
         direction
       );
       
     case 'dueDate':
       return compareValues(
-        a.dueDate ? new Date(a.dueDate).getTime() : null,
-        b.dueDate ? new Date(b.dueDate).getTime() : null,
+        a.dueDate ? a.dueDate.getTime() : null,
+        b.dueDate ? b.dueDate.getTime() : null,
         direction
       );