diff --git a/app/build.gradle b/app/build.gradle
index d17e983..e86b81b 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,8 +10,8 @@ android {
         applicationId "ch.lburgy.heiafrschedule"
         minSdkVersion 18
         targetSdkVersion 29
-        versionCode 2
-        versionName "1.0.1"
+        versionCode 3
+        versionName "1.0.2"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -29,7 +29,7 @@ dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 
     implementation group: 'org.apache.httpcomponents', name: 'httpclient-android', version: '4.3.5.1'
-    implementation 'com.google.android.material:material:1.2.0'
+    implementation 'com.google.android.material:material:1.2.1'
     implementation 'com.squareup.okhttp3:okhttp:4.6.0'
     implementation 'com.squareup.moshi:moshi:1.9.3'
     implementation 'com.squareup.okio:okio:2.8.0'
diff --git a/app/src/main/java/ch/lburgy/heiafrschedule/activities/MainActivity.java b/app/src/main/java/ch/lburgy/heiafrschedule/activities/MainActivity.java
index 74323f4..cd8da88 100644
--- a/app/src/main/java/ch/lburgy/heiafrschedule/activities/MainActivity.java
+++ b/app/src/main/java/ch/lburgy/heiafrschedule/activities/MainActivity.java
@@ -138,7 +138,7 @@ public void run() {
         }).start();
 
         if (savedInstanceState == null) {
-            getLessonsAndShowThem(false);
+            getLessonsAndShowThem(false, true);
         } else {
             lessonsCompletesByDay = (HashMap<Integer, ArrayList<LessonOfClassComplete>>)
                     savedInstanceState.getSerializable(KEY_SAVED_LESSONS);
@@ -146,10 +146,10 @@ public void run() {
                 threadType = (ThreadType) savedInstanceState.getSerializable(KEY_SAVED_THREAD_TYPE);
                 switch (threadType) {
                     case getLessons:
-                        getLessonsAndShowThem(false);
+                        getLessonsAndShowThem(false, false);
                         break;
                     case getLessonsFromInternet:
-                        getLessonsAndShowThem(true);
+                        getLessonsAndShowThem(true, false);
                         break;
                 }
             } else {
@@ -158,17 +158,57 @@ public void run() {
         }
     }
 
-    private void getLessonsAndShowThem(final boolean forceFromInternet) {
+    private boolean isNewer(boolean showToast) throws HttpBasicClient.HttpException, InterruptedIOException, HttpBasicClient.NoInternetConnectionException, UnknownHostException {
+        if (!httpBasicClient.isConnectedToInternet()) return false;
+        Date[] dates = httpBasicClient.getScheduleDates();
+
+        if (dates != null && dates.length == 2 && dates[0] != null && dates[1] != null) {
+            Date[] scheduleDates = prefManager.getScheduleDates();
+            if (scheduleDates[1] == null || scheduleDates[1].compareTo(dates[0]) < 0) {
+                // Delete data
+                lessonDao.deleteLessons();
+                roomHEIAFRDao.deleteRooms();
+                teacherDao.deleteTeachers();
+                prefManager.setLastUpdateRoomsLessons(null);
+                // Set the new schedule dates
+                prefManager.setScheduleDates(dates);
+                if (showToast) {
+                    runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(MainActivity.this, R.string.new_schedules, Toast.LENGTH_LONG).show();
+                        }
+                    });
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private void getLessonsAndShowThem(final boolean forceFromInternet, final boolean firstLaunch) {
         if (MainActivity.this.isDestroyed()) return;
         String progressTitle = getResources().getString(R.string.progress_refresh_lessons_title);
         progressDialog = ProgressDialog.show(this, progressTitle, null, true);
         threadType = ThreadType.getLessons;
+        if (currentThread != null && currentThread.isAlive())
+            currentThread.interrupt();
         currentThread = new Thread(new Runnable() {
             @Override
             public void run() {
                 try {
+                    boolean thisForceFromInternet = forceFromInternet;
                     int httpCode = CODE_NO_PROBLEMS;
-                    if (!forceFromInternet) {
+                    try {
+                        if (firstLaunch && isNewer(true))
+                            thisForceFromInternet = true;
+                    } catch (HttpBasicClient.HttpException e) {
+                        httpCode = e.getCode();
+                    } catch (UnknownHostException | HttpBasicClient.NoInternetConnectionException e) {
+                        httpCode = CODE_NO_CONNECTION;
+                    }
+
+                    if (!thisForceFromInternet) {
                         lessonsCompletesByDay = new HashMap<>();
                         for (int i = 0; i < NB_DAYS; i++)
                             lessonsCompletesByDay.put(i, new ArrayList<LessonOfClassComplete>());
@@ -284,6 +324,8 @@ private void refreshLessons() {
         String progressTitle = getResources().getString(R.string.progress_refresh_lessons_title);
         progressDialog = ProgressDialog.show(this, progressTitle, null, true);
         threadType = ThreadType.getLessonsFromInternet;
+        if (currentThread != null && currentThread.isAlive())
+            currentThread.interrupt();
         currentThread = new Thread(new Runnable() {
             @Override
             public void run() {
@@ -327,6 +369,8 @@ private void getLessonsFromInternet(boolean deleteExisting) throws HttpBasicClie
         if (deleteExisting) {
             lessonClassJoinDao.deleteLessonsFromClass(classHEIAFR.getName());
             lessonClassJoinDao.deleteLessonsNoClass();
+        } else {
+            isNewer(false);
         }
 
         if (roomHEIAFRDao.getNbRoom() == 0) {
@@ -351,7 +395,7 @@ private void getLessonsFromInternet(boolean deleteExisting) throws HttpBasicClie
             try {
                 lessonClassJoinDao.insertLessonClassJoin(new LessonClassJoin(lesson.getId(), classHEIAFR.getName()));
             } catch (SQLiteConstraintException e) {
-                // do nothing, the association is allready in the DB
+                // do nothing, the association is already in the DB
             }
 
             ArrayList<RoomHEIAFR> rooms = new ArrayList<>();
@@ -365,7 +409,7 @@ private void getLessonsFromInternet(boolean deleteExisting) throws HttpBasicClie
                 try {
                     lessonRoomJoinDao.insertLessonRoomJoin(new LessonRoomJoin(lesson.getId(), roomID));
                 } catch (SQLiteConstraintException e) {
-                    // do nothing, the association is allready in the DB
+                    // do nothing, the association is already in the DB
                 }
             }
 
@@ -390,6 +434,7 @@ private void getLessonsFromInternet(boolean deleteExisting) throws HttpBasicClie
         }
         classHEIAFR.setLastUpdate(new Date());
         classHEIAFRDao.updateClassHEIAFR(classHEIAFR);
+        prefManager.setScheduleDates(httpBasicClient.getScheduleDates());
     }
 
     private void showHttpErrorCode(int httpCode) {
@@ -460,7 +505,7 @@ public void run() {
                         });
                     }
                 }).start();
-                getLessonsAndShowThem(false);
+                getLessonsAndShowThem(false, false);
             }
         }
         if (prefManager.isLaunchWelcome()) {
diff --git a/app/src/main/java/ch/lburgy/heiafrschedule/activities/SettingsActivity.java b/app/src/main/java/ch/lburgy/heiafrschedule/activities/SettingsActivity.java
index 087d4f8..38dbdc7 100644
--- a/app/src/main/java/ch/lburgy/heiafrschedule/activities/SettingsActivity.java
+++ b/app/src/main/java/ch/lburgy/heiafrschedule/activities/SettingsActivity.java
@@ -19,7 +19,10 @@
 
 import java.io.InterruptedIOException;
 import java.net.UnknownHostException;
+import java.text.DateFormat;
+import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 
 import ch.lburgy.heiafrschedule.R;
 import ch.lburgy.heiafrschedule.database.ClassHEIAFR;
@@ -162,11 +165,18 @@ public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
                 findPreference(keyTheme9).setVisible(true);
             }
 
-            Preference btnDeleteDatas = findPreference(getString(R.string.settings_key_delete_datas));
-            btnDeleteDatas.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            Date[] dates = prefManager.getScheduleDates();
+            if (dates != null && dates.length == 2 && dates[0] != null && dates[1] != null) {
+                DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT, Locale.getDefault());
+                Preference preference = findPreference(getString(R.string.settings_key_data_schedule_dates));
+                preference.setTitle(getResources().getString(R.string.data_schedule_dates, df.format(dates[0]), df.format(dates[1])));
+                preference.setVisible(true);
+            }
+
+            findPreference(getString(R.string.settings_key_delete_data)).setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
                 @Override
                 public boolean onPreferenceClick(Preference preference) {
-                    deleteDatas();
+                    deleteData();
                     return true;
                 }
             });
@@ -243,7 +253,7 @@ public void run() {
             }).start();
         }
 
-        private void deleteDatas() {
+        private void deleteData() {
             new Thread(new Runnable() {
                 @Override
                 public void run() {
@@ -251,10 +261,12 @@ public void run() {
                     roomHEIAFRDao.deleteRooms();
                     teacherDao.deleteTeachers();
                     prefManager.setLastUpdateRoomsLessons(null);
+                    prefManager.setScheduleDates(new Date[2]);
                     classChanged = true;
                     getActivity().runOnUiThread(new Runnable() {
                         public void run() {
-                            String message = getResources().getString(R.string.datas_deleted);
+                            findPreference(getString(R.string.settings_key_data_schedule_dates)).setVisible(false);
+                            String message = getResources().getString(R.string.data_deleted);
                             Toast.makeText(getContext(), message, Toast.LENGTH_SHORT).show();
                         }
                     });
diff --git a/app/src/main/java/ch/lburgy/heiafrschedule/http/HttpBasicClient.java b/app/src/main/java/ch/lburgy/heiafrschedule/http/HttpBasicClient.java
index e61105c..4942fea 100644
--- a/app/src/main/java/ch/lburgy/heiafrschedule/http/HttpBasicClient.java
+++ b/app/src/main/java/ch/lburgy/heiafrschedule/http/HttpBasicClient.java
@@ -25,8 +25,12 @@
 import java.io.IOException;
 import java.io.InterruptedIOException;
 import java.net.UnknownHostException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
 import java.util.ArrayList;
+import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -85,11 +89,46 @@ private void initCredentials(String username, String password) {
         }
     }
 
+    public Date[] getScheduleDates() throws HttpException, UnknownHostException, NoInternetConnectionException, InterruptedIOException {
+        Document doc = getDoc(URL_CLASSES, true);
+        if (doc == null) return null;
+
+        Date[] dates = new Date[2];
+        Element table = doc.getElementsByTag("table").get(4);
+        Element script = table.getElementsByTag("script").get(0);
+        String scriptContent = script.childNode(0).toString();
+
+        // Get the HTML from within the script tag
+        Pattern pattern = Pattern.compile("<.*>");
+        Matcher matcher = pattern.matcher(scriptContent);
+        matcher.find();
+        String datesString = Jsoup.parse(matcher.group(0)).text();
+
+        // Get the dates
+        pattern = Pattern.compile(".*?du (.*?) au (.*)");
+        matcher = pattern.matcher(datesString);
+        matcher.find();
+        String firstDate = matcher.group(1);
+        String secondDate = matcher.group(2);
+
+        // Parse them
+        SimpleDateFormat parser = new SimpleDateFormat("dd MMM yyyy", Locale.FRENCH);
+        try {
+            dates[0] = parser.parse(firstDate);
+            dates[1] = parser.parse(secondDate);
+        } catch (ParseException e) {
+            e.printStackTrace();
+            return null;
+        }
+
+        return dates;
+    }
+
     public List<ClassHEIAFR> getClasses() throws HttpException, UnknownHostException, NoInternetConnectionException, InterruptedIOException {
-        ArrayList<ClassHEIAFR> classes = new ArrayList<>();
         Document doc = getDoc(URL_CLASSES, true);
         if (doc == null) return null;
 
+        ArrayList<ClassHEIAFR> classes = new ArrayList<>();
         Element select = doc.getElementsByTag("select").first();
         Elements options = select.getElementsByTag("option");
         for (Element option : options) {
diff --git a/app/src/main/java/ch/lburgy/heiafrschedule/preferences/PrefManager.java b/app/src/main/java/ch/lburgy/heiafrschedule/preferences/PrefManager.java
index 0334378..098e471 100644
--- a/app/src/main/java/ch/lburgy/heiafrschedule/preferences/PrefManager.java
+++ b/app/src/main/java/ch/lburgy/heiafrschedule/preferences/PrefManager.java
@@ -23,6 +23,8 @@ public class PrefManager {
     private static final String KEY_CLASS_ID = "class_id";
     private static final String KEY_THEME = "theme";
     private static final String KEY_LAST_UPDATE_ROOMS_LESSONS = "last_update_rooms_lessons";
+    private static final String KEY_SCHEDULE_DATE_1 = "schedule_date_1";
+    private static final String KEY_SCHEDULE_DATE_2 = "schedule_date_2";
 
     private static final String KEY_IV = "-iv";
     private static final String KEY_ENCRYPTED = "encrypted_key";
@@ -112,6 +114,21 @@ public Date getLastUpdateRoomsLessons() {
         return DateConverter.toDate(pref.getLong(KEY_LAST_UPDATE_ROOMS_LESSONS, -1));
     }
 
+    public void setScheduleDates(Date[] scheduleDates) {
+        if (scheduleDates != null && scheduleDates.length == 2) {
+            editor.putLong(KEY_SCHEDULE_DATE_1, DateConverter.fromDate(scheduleDates[0]));
+            editor.putLong(KEY_SCHEDULE_DATE_2, DateConverter.fromDate(scheduleDates[1]));
+            editor.commit();
+        }
+    }
+
+    public Date[] getScheduleDates() {
+        Date[] scheduleDates = new Date[2];
+        scheduleDates[0] = DateConverter.toDate(pref.getLong(KEY_SCHEDULE_DATE_1, -1));
+        scheduleDates[1] = DateConverter.toDate(pref.getLong(KEY_SCHEDULE_DATE_2, -1));
+        return scheduleDates;
+    }
+
     public void setTheme(int theme) {
         editor.putInt(KEY_THEME, theme);
         editor.commit();
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 700a9f6..e8ff75f 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -21,7 +21,7 @@
     <string name="classes_refreshed">Die Liste der Klassen wurde aktualisiert</string>
     <string name="infos_header">Informationen</string>
     <string name="display_header">Display</string>
-    <string name="datas_header">Daten</string>
+    <string name="data_header">Daten</string>
     <string name="theme_title">Design</string>
     <string name="classes_dialog_title">Wählen Sie Ihre Klasse</string>
     <string name="theme_dialog_title">Design auswählen</string>
@@ -32,8 +32,8 @@
     <string name="action_find_room">Einen Raum finden</string>
     <string name="error_end_time_before_start">Die Endzeit muss später als die Startzeit liegen</string>
     <string name="progress_search_rooms_title">Räume für Sie suchen …</string>
-    <string name="delete_datas">Lokale Daten löschen</string>
-    <string name="datas_deleted">Lokale Daten wurden gelöscht</string>
+    <string name="delete_data">Lokale Daten löschen</string>
+    <string name="data_deleted">Lokale Daten wurden gelöscht</string>
     <string name="warning_first_search">Da dies das erste Mal ist, dass Sie einen Raum finden wollen, muss die Anwendung alle Unterrichte aller Räume aus dem Internet abrufen, was bis zu 2 oder 3 Minuten dauern kann.</string>
     <string name="dialog_downloading_title">Das Update herunterladen …</string>
     <string name="dialog_update_title">Möchten Sie die Anwendung aktualisieren ?</string>
@@ -46,4 +46,6 @@
     <string name="about_header">Über</string>
     <string name="licenses_header">Lizenzen</string>
     <string name="see_github_title">Siehe das Projekt auf GitHub</string>
+    <string name="data_schedule_dates">Zeitplan vom %1$s bis %2$s</string>
+    <string name="new_schedules">Neue Zeitpläne sind verfügbar !</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-fr/strings.xml b/app/src/main/res/values-fr/strings.xml
index b7832a5..86f89cb 100644
--- a/app/src/main/res/values-fr/strings.xml
+++ b/app/src/main/res/values-fr/strings.xml
@@ -22,7 +22,7 @@
     <string name="title_activity_settings">Paramètres</string>
     <string name="display_header">Affichage</string>
     <string name="infos_header">Informations</string>
-    <string name="datas_header">Données</string>
+    <string name="data_header">Données</string>
     <string name="theme_title">Thème</string>
     <string name="classes_dialog_title">Choisissez votre classe</string>
     <string name="classes_title">Classe</string>
@@ -32,8 +32,8 @@
     <string name="action_find_room">Trouver une salle</string>
     <string name="error_end_time_before_start">L\'heure de fin doit être postérieure à l\'heure de début</string>
     <string name="progress_search_rooms_title">Recherche de salles pour vous …</string>
-    <string name="delete_datas">Supprimer les données locales</string>
-    <string name="datas_deleted">Les données locales ont été supprimées</string>
+    <string name="delete_data">Supprimer les données locales</string>
+    <string name="data_deleted">Les données locales ont été supprimées</string>
     <string name="warning_first_search">Etant donné que c\'est la première fois que vous voulez trouver une salle, l\'application doit obtenir tous les cours de toutes les salles à partir d\'Internet, ce qui peut prendre jusqu\'à 2 ou 3 minutes.</string>
     <string name="dialog_update_title">Voulez-vous mettre à jour l\'application ?</string>
     <string name="dialog_downloading_title">Téléchargement de la mise à jour …</string>
@@ -46,4 +46,6 @@
     <string name="license_moshi_description">par Square Open Source, sous license Apache 2.0</string>
     <string name="license_jsoup_description">par Jonathan Hedley, sous license MIT</string>
     <string name="license_httpcomponents_description">par The Apache Software Foundation, sous license Apache 2.0</string>
+    <string name="data_schedule_dates">Horaires du %1$s au %2$s</string>
+    <string name="new_schedules">De nouveaux horaires sont disponibles !</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-it/strings.xml b/app/src/main/res/values-it/strings.xml
index 89d9030..b0d7d4f 100644
--- a/app/src/main/res/values-it/strings.xml
+++ b/app/src/main/res/values-it/strings.xml
@@ -18,7 +18,7 @@
     <string name="title_activity_settings">Impostazioni</string>
     <string name="http_error">Errore HTTP</string>
     <string name="infos_header">Informazioni</string>
-    <string name="datas_header">Dati</string>
+    <string name="data_header">Dati</string>
     <string name="theme_title">Tema</string>
     <string name="classes_dialog_title">Scelga la vostra classe</string>
     <string name="theme_dialog_title">Scelga tema</string>
@@ -32,8 +32,8 @@
     <string name="action_find_room">Trovare una stanza</string>
     <string name="error_end_time_before_start">L\'ora della fine deve essere successiva all\'ora del inizio</string>
     <string name="progress_search_rooms_title">Ricerca stanze per lei …</string>
-    <string name="delete_datas">Cancellare i dati locali</string>
-    <string name="datas_deleted">I dati locali sono stati cancellati</string>
+    <string name="delete_data">Cancellare i dati locali</string>
+    <string name="data_deleted">I dati locali sono stati cancellati</string>
     <string name="warning_first_search">Poiché è la prima volta che si desidera trovare una stanza, l\'applicazione deve recuperare tutte le lezioni di tutte le stanze da Internet, che può richiedere fino a 2 o 3 minuti.</string>
     <string name="dialog_update_title">Vuole aggiornare l\'applicazione ?</string>
     <string name="dialog_downloading_title">Il download del aggiornamento …</string>
@@ -46,4 +46,6 @@
     <string name="about_header">About</string>
     <string name="licenses_header">Licenze</string>
     <string name="see_github_title">Vedi il progetto su GitHub</string>
+    <string name="data_schedule_dates">Orari dal %1$s al %2$s</string>
+    <string name="new_schedules">Sono disponibili nuovi orari !</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 089879e..8a08795 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -6,6 +6,7 @@
 
     <!-- Main screen -->
     <string name="progress_refresh_lessons_title">Retrieving lessons …</string>
+    <string name="new_schedules">New schedules are available !</string>
 
     <!-- Bottom navigation -->
     <string name="day_0">Monday</string>
@@ -43,7 +44,7 @@
     <string name="title_activity_settings">Settings</string>
     <string name="display_header">Display</string>
     <string name="infos_header">Informations</string>
-    <string name="datas_header">Datas</string>
+    <string name="data_header">Data</string>
     <string name="about_header">About</string>
     <string name="licenses_header">Licenses</string>
 
@@ -51,7 +52,8 @@
     <string name="settings_key_theme_9" translatable="false">theme_9</string>
     <string name="settings_key_theme_10" translatable="false">theme_10</string>
     <string name="settings_key_class" translatable="false">class</string>
-    <string name="settings_key_delete_datas" translatable="false">delete_datas</string>
+    <string name="settings_key_delete_data" translatable="false">delete_data</string>
+    <string name="settings_key_data_schedule_dates" translatable="false">data_schedule_date</string>
     <string name="settings_key_see_github" translatable="false">github</string>
     <string name="settings_key_license_httpcomponents" translatable="false">license_httpcomponents</string>
     <string name="settings_key_license_jsoup" translatable="false">license_jsoup</string>
@@ -68,10 +70,11 @@
     <string name="classes_title">Class</string>
     <string name="classes_dialog_title">Choose your class</string>
 
-    <!-- Datas Settings -->
-    <string name="delete_datas">Delete the local datas</string>
-    <string name="datas_deleted">The local datas have been deleted</string>
+    <!-- Data Settings -->
+    <string name="delete_data">Delete the local data</string>
+    <string name="data_deleted">The local data have been deleted</string>
     <string name="classes_refreshed">The class list has been refreshed</string>
+    <string name="data_schedule_dates">Schedule from %1$s to %2$s</string>
 
     <!-- About Settings -->
     <string name="see_github_title">See the project on GitHub</string>
diff --git a/app/src/main/res/xml/root_preferences.xml b/app/src/main/res/xml/root_preferences.xml
index 7648355..04b54d2 100644
--- a/app/src/main/res/xml/root_preferences.xml
+++ b/app/src/main/res/xml/root_preferences.xml
@@ -43,13 +43,18 @@
 
     <PreferenceCategory
         app:iconSpaceReserved="false"
-        app:title="@string/datas_header">
+        app:title="@string/data_header">
 
         <Preference
             app:icon="@drawable/ic_delete"
             app:iconSpaceReserved="false"
-            app:key="@string/settings_key_delete_datas"
-            app:title="@string/delete_datas" />
+            app:key="@string/settings_key_delete_data"
+            app:title="@string/delete_data" />
+
+        <Preference
+            app:iconSpaceReserved="false"
+            app:isPreferenceVisible="false"
+            app:key="@string/settings_key_data_schedule_dates" />
 
     </PreferenceCategory>