switch to prisma

helpers/date.ts

@@ -1,4 +1,4 @@
-import { parse, format, addDays, subDays } from 'date-fns'
+import { parse, format, addDays, subDays, differenceInDays } from 'date-fns'
 import { utcToZonedTime } from 'date-fns-tz'
 
 const FRONTEND_FORMAT = 'dd.MM.yyyy'
@@ -23,18 +23,18 @@ export function getDays({
   endDate,
   endDateExclusive = false,
 }: {
-  startDate: Date
-  endDate: Date
+  startDate: string,
+  endDate: string,
   endDateExclusive?: boolean
 }): string[] {
-  let currentDay = new Date(startDate.getTime())
+  let currentDay = new Date(startDate);
   const days = [dateFormatBackend(currentDay)]
 
   if (!endDate) {
     return days
   }
 
-  const inclusiveEndDate = endDateExclusive ? subDays(endDate, 1) : endDate
+  const inclusiveEndDate = endDateExclusive ? subDays(new Date(endDate), 1) : new Date(endDate)
 
   while (currentDay < inclusiveEndDate) {
     currentDay = addDays(currentDay, 1)
@@ -84,3 +84,8 @@ export function nowInTz(timezone = 'Europe/Berlin'): Date {
 export function getNextDay(date: Date) {
   return addDays(date, 1)
 }
+
+export function getDayCount({ startDate, endDate }: { startDate: string, endDate: string }) {
+  // TODO: check if this actually works as expected
+  return differenceInDays(new Date(startDate), new Date(endDate)) + 1 // add one as it only counts full days;
+}