replace momentjs (incl. calendar)

helpers/date.ts

@@ -1,50 +1,49 @@
-import moment from 'moment'
+import { parse, format, addDays } from 'date-fns'
 
-const FRONTEND_FORMAT = 'DD.MM.YYYY'
-const BACKEND_FORMAT = 'YYYY-MM-DD'
+const FRONTEND_FORMAT = 'dd.MM.yyyy'
+const BACKEND_FORMAT = 'yyyy-MM-dd'
 
 export function getDays({
   startDate,
   endDate,
 }: {
-  startDate: moment.MomentInput
-  endDate: moment.MomentInput
+  startDate: Date
+  endDate: Date
 }) {
-  let currentDay = moment(startDate)
+  let currentDay = new Date(startDate.getTime())
   const days = [dateFormatBackend(currentDay)]
 
   if (!endDate) {
     return days
   }
 
-  const end = moment(endDate)
-  while (currentDay < end) {
-    currentDay = currentDay.add(1, 'day')
+  while (currentDay < endDate) {
+    currentDay = addDays(currentDay, 1)
     days.push(dateFormatBackend(currentDay))
   }
 
   return days
 }
 
-function dateFormat(date: moment.MomentInput, format: string) {
+function dateFormat(date: Date, formatString: string) {
   if (!date) {
     return null
   }
-  return moment(date).format(format)
+  return format(date, formatString)
 }
 
-export function dateFormatBackend(date: moment.MomentInput) {
+export function dateFormatBackend(date: Date) {
   return dateFormat(date, BACKEND_FORMAT)
 }
 
-export function dateFormatFrontend(date: moment.MomentInput) {
+export function dateFormatFrontend(date: Date) {
   return dateFormat(date, FRONTEND_FORMAT)
 }
 
-function dateParse(input: string, format: string) {
-  const date = moment(input, format)
-  if (date.isValid()) {
-    return date.toDate()
+function dateParse(input: string, formatString: string) {
+  const date = parse(input, formatString, new Date())
+  if (date.getTime() !== NaN) {
+    return date
   }
 
   return null