getItemIndex - improve comparison by not using isSameMonth tool

Author: Inbal-Tish

src/incubator/Calendar/helpers/CalendarProcessor.ts

@@ -1,7 +1,6 @@
 
 export function generateMonthItems(date: number, pastRange: number, futureRange: number) {
-  const currentDate = new Date(date);
-  const currentYear = currentDate.getFullYear();
+  const currentYear = new Date(date).getFullYear();
   const monthItems = [];
   for (let year = currentYear - pastRange; year <= currentYear + futureRange; year++) {
     for (let month = 0; month < 12; month++) {

src/incubator/Calendar/index.tsx

@@ -4,7 +4,7 @@ import {FlashListPackage} from 'optionalDeps';
 import {Constants} from '../../commons/new';
 import {generateMonthItems} from './helpers/CalendarProcessor';
 import {addHeaders} from './helpers/DataProcessor';
-import {isSameMonth, getTimestamp, addYears} from './helpers/DateUtils';
+import {isSameMonth, getTimestamp, addYears, getDateObject} from './helpers/DateUtils';
 import {CalendarContextProps, CalendarProps, FirstDayOfWeek, UpdateSource, DateObjectWithOptionalDay} from './types';
 import CalendarContext from './CalendarContext';
 import CalendarItem from './CalendarItem';
@@ -36,8 +36,9 @@ function Calendar(props: PropsWithChildren<CalendarProps>) {
 
   const getItemIndex = useCallback((date: number) => {
     'worklet';
+    const dateObject = getDateObject(date);
     for (let i = 0; i < items.length; i++) {
-      if (isSameMonth(items[i], date)) {
+      if (items[i].month === dateObject.month) {
         return i;
       }
     }