diff --git a/ui/src/routes/working-hours/+page.server.js b/ui/src/routes/working-hours/+page.server.js
index 3459835..6656eaa 100644
--- a/ui/src/routes/working-hours/+page.server.js
+++ b/ui/src/routes/working-hours/+page.server.js
@@ -19,7 +19,7 @@ const getMonday = actualDayObject => {
 }
 
 /** @type {String[]} **/
-const day_list = ['Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag', 'Sontag']
+const weekday_list = ['Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag', 'Sontag']
 
 /** @param {Date} actualDayObject **/
 const getDateString = actualDayObject => {
@@ -49,17 +49,23 @@ export const actions = {
         const form_data = await request.formData();
         // @ts-ignore
         let actualDayObject = getMonday(new Date(form_data.get('week')))
-        day_list.forEach(day => {
-            if (form_data.get(day) !== '00:00:00' && form_data.get(day) !== '00:00') {
-                const working_day = getDateString(actualDayObject)
-                const body_data = {
-                    workingDay: working_day,
-                    workingTime: form_data.get(day),
-                }
-                WorkingHoursRepository.addOrUpdate(env.API_URL, working_day, body_data);
-            }
+        /** @type {Object<String,String>} **/
+        let day_list = {}
+        weekday_list.forEach(day => {
+            day_list[day] = getDateString(actualDayObject)
             actualDayObject.setDate(actualDayObject.getDate() + 1)
         })
+        for (const pair of form_data.entries()) {
+            const working_day = day_list[pair[0]] ?? null
+            if (working_day === null) {
+                continue
+            }
+            const body_data = {
+                workingDay: working_day,
+                workingTime: pair[1],
+            }
+            await WorkingHoursRepository.addOrUpdate(env.API_URL, working_day, body_data);
+        }
     },
     'import-csv': async ({ request }) => {
         const form_data = await request.formData();