diff --git a/apps/skolplattformen-app/components/week.component.tsx b/apps/skolplattformen-app/components/week.component.tsx
index 01c3e174..893223ec 100644
--- a/apps/skolplattformen-app/components/week.component.tsx
+++ b/apps/skolplattformen-app/components/week.component.tsx
@@ -107,7 +107,13 @@ export const Day = ({ weekDay, lunch, lessons }: DayProps) => {
 }
 
 export const Week = ({ child }: WeekProps) => {
-  moment.locale(LanguageService.getLocale())
+  const locale = LanguageService.getLocale()
+  moment.updateLocale(locale, {
+    week: {
+      dow: 1, // Monday is the first day of the week.
+    },
+  })
+  moment.locale(locale)
   const days = moment.weekdaysShort().slice(1, 6)
   const displayDate = getMeaningfulStartingDate(moment())