diff --git a/mensa.py b/mensa.py
index 7ac213b..f0d5666 100644
--- a/mensa.py
+++ b/mensa.py
@@ -3,21 +3,19 @@ from telegram import ParseMode, Update
 import requests
 from telegram.ext import CallbackContext
 
-DISABLED_GROUPS = [-1001301570558]
-
 DIETS = {
     "veggy": ["Vegetarisch", "Vegan"],
     "vegan": ["Vegan"]
 }
 
 WEEKDAYS = {
-    "montag": 1,
-    "dienstag": 2,
-    "mittwoch": 3,
-    "donnerstag": 4,
-    "freitag": 5,
-    "samstag": 6,
-    "sonntag": 7
+    "montag": 0,
+    "dienstag": 1,
+    "mittwoch": 2,
+    "donnerstag": 3,
+    "freitag": 4,
+    "samstag": 5,
+    "sonntag": 6
 }
 
 MENSA_URL = {
@@ -77,8 +75,6 @@ def linux_mensa(update: Update, context: CallbackContext):
 
 
 def mensa(update: Update, context: CallbackContext):
-    if update.message.chat_id in DISABLED_GROUPS:
-        return
     which = "zentral"
     filter_categories = MODES["light"]
     diet = [""]
@@ -92,8 +88,13 @@ def mensa(update: Update, context: CallbackContext):
         elif arg in MODES:
             filter_categories = MODES[arg]
         elif arg in WEEKDAYS:
-            date_offset = (6 - today.weekday() + WEEKDAYS[arg])
-            today += datetime.timedelta(days=date_offset)
+            day = WEEKDAYS[arg]
+            offset = 0
+            if day > today.weekday():
+                offset = day - today.weekday()
+            elif day < today.weekday():
+                offset = (7 - today.weekday() + WEEKDAYS[arg])
+            today += datetime.timedelta(days=offset)
             auto_next_day = False
         elif arg in DIETS:
             diet = DIETS[arg]