feat: convert to nextjs

utils/dateFunctions.ts

@@ -0,0 +1,33 @@
+export function getWeekRanges(
+  targetDate: Date,
+  numWeeks: number
+): Array<{ start: Date; end: Date }> {
+  if (numWeeks < 1 || numWeeks > 8) {
+    throw new Error('Number of weeks must be between 1 and 8');
+  }
+
+  const ranges = [];
+  const firstDay = new Date(targetDate);
+  firstDay.setUTCHours(0, 0, 0, 0);
+
+  const dayOfWeek = firstDay.getUTCDay();
+  const diff = dayOfWeek === 0 ? -6 : 1 - dayOfWeek;
+  firstDay.setUTCDate(firstDay.getUTCDate() + diff);
+
+  for (let i = 0; i < numWeeks; i++) {
+    const weekStart = new Date(firstDay);
+    weekStart.setUTCDate(weekStart.getUTCDate() + i * 7);
+
+    const weekEnd = new Date(weekStart);
+    weekEnd.setUTCDate(weekEnd.getUTCDate() + 6);
+    weekEnd.setUTCHours(23, 59, 59, 999);
+
+    ranges.push({ start: weekStart, end: weekEnd });
+  }
+
+  return ranges;
+}
+
+export function isDateInRange(date: Date, start: Date, end: Date): boolean {
+  return date >= start && date <= end;
+}