fixed compare

src/utils/dateUtils.ts

@@ -0,0 +1,33 @@
+export const format = (d: Date) =>
+  `${d.getDate()} ${d.toLocaleString("default", { month: "short" })}`;
+
+export const startOfDay = (d: Date) => {
+  const x = new Date(d);
+  x.setHours(0, 0, 0, 0);
+  return x;
+};
+
+export const endOfDay = (d: Date) => {
+  const x = new Date(d);
+  x.setHours(23, 59, 59, 999);
+  return x;
+};
+
+export const getStartOfWeek = (d: Date) => {
+  const date = new Date(d);
+  const day = date.getDay() || 7;
+  if (day !== 1) date.setDate(date.getDate() - (day - 1));
+  return startOfDay(date);
+};
+
+export const shiftDate = (d: Date, days: number) =>
+  new Date(d.getTime() + days * 86400000);
+
+export const getWeekIndex = (date: Date) => {
+  const firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
+  const firstWeekStart = getStartOfWeek(firstDay);
+  return Math.floor(
+    (startOfDay(date).getTime() - firstWeekStart.getTime()) /
+      (7 * 86400000)
+  );
+};