also get booked days from calendar

helpers/array.ts

@@ -16,3 +16,7 @@ export function getNextBigger<T>(array: T[], pivot: T): T {
 
   return array.sort().find((day) => day > pivot)
 }
+
+export function uniqueFilter(value, index, self) {
+  return self.indexOf(value) === index;
+}

helpers/date.ts

@@ -1,4 +1,4 @@
-import { parse, format, addDays } from 'date-fns'
+import { parse, format, addDays, subDays } from 'date-fns'
 import { utcToZonedTime } from 'date-fns-tz'
 
 const FRONTEND_FORMAT = 'dd.MM.yyyy'
@@ -21,9 +21,11 @@ export function daysFormatFrontend(days: string[]): string {
 export function getDays({
   startDate,
   endDate,
+  endDateExclusive = false,
 }: {
   startDate: Date
   endDate: Date
+  endDateExclusive?: boolean
 }): string[] {
   let currentDay = new Date(startDate.getTime())
   const days = [dateFormatBackend(currentDay)]
@@ -32,7 +34,9 @@ export function getDays({
     return days
   }
 
-  while (currentDay < endDate) {
+  const inclusiveEndDate = endDateExclusive ? subDays(endDate, 1) : endDate;
+
+  while (currentDay < inclusiveEndDate) {
     currentDay = addDays(currentDay, 1)
     days.push(dateFormatBackend(currentDay))
   }