organize events by months, weeks and days and print a calendar view

web/src/lib/date.ts

@@ -1,5 +1,6 @@
-import { isToday, isAfter, parseISO } from "date-fns";
-import { toZonedTime, format } from "date-fns-tz";
+import { isToday, isAfter, parse } from "date-fns";
+import { nb } from "date-fns/locale";
+import { toZonedTime, format} from "date-fns-tz";
 
 const timeZone = "Europe/Oslo";
 
@@ -10,7 +11,16 @@ export function toLocalTime(date: Date | string | number) {
 }
 
 export function formatDate(date: Date | string | number, formatStr: string) {
-  return format(toLocalTime(date), formatStr, { timeZone });
+  return format(toLocalTime(date), formatStr, { timeZone, locale: nb });
+}
+
+export function formatYearMonth(yearMonth: string) {
+  // full name of month if year is current year, otherwise name of month + year
+  const parsed = parse(yearMonth, "yyyy-MM", new Date());
+  if (parsed.getFullYear === new Date().getFullYear) {
+    return formatDate(parsed, "MMMM");
+  }
+  return formatDate(parsed, "MMMM yyyy");
 }
 
 export function isTodayOrFuture(