date issue fixed

apps/Frontend/src/utils/dateUtils.ts

@@ -0,0 +1,62 @@
+import { format } from "date-fns";
+
+/**
+ * Parse a date string in yyyy-MM-dd format (assumed local) into a JS Date object.
+ * No timezone conversion is applied. Returns a Date at midnight local time.
+ */
+export function parseLocalDateString(dateStr: string): Date {
+  const parts = dateStr.split("-");
+
+  // Destructure with fallback
+  const [yearStr, monthStr, dayStr] = parts;
+
+  // Validate all parts are defined and valid strings
+  if (!yearStr || !monthStr || !dayStr) {
+    throw new Error("Invalid date string format. Expected yyyy-MM-dd.");
+  }
+
+  const year = parseInt(yearStr, 10);
+  const month = parseInt(monthStr, 10) - 1; // JS Date months are 0-based
+  const day = parseInt(dayStr, 10);
+
+  if (Number.isNaN(year) || Number.isNaN(month) || Number.isNaN(day)) {
+    throw new Error("Invalid numeric values in date string.");
+  }
+
+  return new Date(year, month, day);
+}
+
+
+
+/**
+ * Format a JS Date object as a `yyyy-MM-dd` string (in local time).
+ * Useful for saving date-only data without time component.
+ */
+export function formatLocalDate(date: Date): string {
+  return format(date, "yyyy-MM-dd");
+}
+
+/**
+ * Get a Date object representing midnight UTC for a given local date.
+ * Useful for comparing or storing dates consistently across timezones.
+ */
+export function toUTCDate(date: Date): Date {
+  return new Date(Date.UTC(date.getFullYear(), date.getMonth(), date.getDate()));
+}
+
+/**
+ * Converts a stored UTC date string (e.g. from DB) into a Date object
+ * and formats it as local yyyy-MM-dd string for UI use.
+ */
+export function formatUTCDateStringToLocal(dateStr: string): string {
+  const date = new Date(dateStr); // parsed as UTC
+  return formatLocalDate(date);
+}
+
+/**
+ * Ensure any date (Date|string) is formatted to ISO string for consistent backend storage.
+ * If it's already a string, pass through. If it's a Date, convert to ISO.
+ */
+export function normalizeToISOString(date: Date | string): string {
+  return date instanceof Date ? date.toISOString() : date;
+}