lets use manually translated month names for reliability

app/src/main/java/com/simplemobiletools/calendar/CalendarImpl.java

@@ -92,7 +92,7 @@ public class CalendarImpl implements DBHelper.DBOperationsListener {
     }
 
     private String getMonthName() {
-        String month = Formatter.getMonthName(mTargetDate.getMonthOfYear() - 1);
+        String month = Formatter.getMonthName(mContext, mTargetDate.getMonthOfYear() - 1);
         final String targetYear = mTargetDate.toString(YEAR_PATTERN);
         if (!targetYear.equals(new DateTime().toString(YEAR_PATTERN))) {
             month += " " + targetYear;

app/src/main/java/com/simplemobiletools/calendar/Formatter.java

@@ -1,28 +1,26 @@
 package com.simplemobiletools.calendar;
 
-import android.text.format.DateFormat;
+import android.content.Context;
 
 import org.joda.time.DateTime;
 import org.joda.time.DateTimeZone;
 import org.joda.time.format.DateTimeFormat;
 import org.joda.time.format.DateTimeFormatter;
 
-import java.util.Date;
-
 public class Formatter {
     public static final String DAYCODE_PATTERN = "YYMMdd";
     private static final String EVENT_DATE_PATTERN = "d YYYY"; // MMMM doesn't give the proper month name in some languages
     private static final String EVENT_TIME_PATTERN = "HH:mm";
 
-    public static String getEventDate(String dayCode) {
+    public static String getEventDate(Context context, String dayCode) {
         final String dayYear = getDateTimeFromCode(dayCode).toString(EVENT_DATE_PATTERN);
         final int monthIndex = Integer.valueOf(dayCode.substring(2, 4)) - 1;
-        return getMonthName(monthIndex) + " " + dayYear;
+        return getMonthName(context, monthIndex) + " " + dayYear;
     }
 
-    public static String getEventDate(DateTime dateTime) {
+    public static String getEventDate(Context context, DateTime dateTime) {
         final String dayYear = dateTime.toString(EVENT_DATE_PATTERN);
-        return getMonthName(dateTime.getMonthOfYear() - 1) + " " + dayYear;
+        return getMonthName(context, dateTime.getMonthOfYear() - 1) + " " + dayYear;
     }
 
     public static String getEventTime(DateTime dateTime) {
@@ -63,11 +61,8 @@ public class Formatter {
         return dateTime.toDateTime(DateTimeZone.getDefault()).toString(Formatter.DAYCODE_PATTERN);
     }
 
-    public static String getMonthName(int id) {
-        final Date date = new Date();
-        date.setDate(1);
-        date.setMonth(id);
-        String month = DateFormat.format("LLLL", date).toString();
-        return month.substring(0, 1).toUpperCase() + month.substring(1).toLowerCase();
+    // use manually translated month names, as DateFormat and Joda have issues with a lot of languages
+    public static String getMonthName(Context context, int id) {
+        return context.getResources().getStringArray(R.array.months)[id];
     }
 }

app/src/main/java/com/simplemobiletools/calendar/activities/DayActivity.java

@@ -74,7 +74,7 @@ public class DayActivity extends SimpleActivity
         if (mDayCode == null || mDayCode.isEmpty())
             return;
 
-        final String date = Formatter.getEventDate(mDayCode);
+        final String date = Formatter.getEventDate(getApplicationContext(), mDayCode);
         mDateTV.setText(date);
         mToBeDeleted = new ArrayList<>();
 

app/src/main/java/com/simplemobiletools/calendar/activities/EventActivity.java

@@ -219,7 +219,7 @@ public class EventActivity extends SimpleActivity implements DBHelper.DBOperatio
     }
 
     private void updateStartDate() {
-        mStartDate.setText(Formatter.getEventDate(mEventStartDateTime));
+        mStartDate.setText(Formatter.getEventDate(getApplicationContext(), mEventStartDateTime));
     }
 
     private void updateStartTime() {
@@ -227,7 +227,7 @@ public class EventActivity extends SimpleActivity implements DBHelper.DBOperatio
     }
 
     private void updateEndDate() {
-        mEndDate.setText(Formatter.getEventDate(mEventEndDateTime));
+        mEndDate.setText(Formatter.getEventDate(getApplicationContext(), mEventEndDateTime));
     }
 
     private void updateEndTime() {

app/src/main/res/values-it/strings.xml

@@ -53,4 +53,17 @@
         <item quantity="one">1 evento eliminato</item>
         <item quantity="other">%1$d eventi eliminati</item>
     </plurals>
+
+    <string name="january">Gennaio</string>
+    <string name="february">Febbraio</string>
+    <string name="march">Marzo</string>
+    <string name="april">Aprile</string>
+    <string name="may">Può</string>
+    <string name="june">Giugno</string>
+    <string name="july">Luglio</string>
+    <string name="august">August</string>
+    <string name="september">Settembre</string>
+    <string name="october">Ottobre</string>
+    <string name="november">Novembre</string>
+    <string name="december">Dicembre</string>
 </resources>

app/src/main/res/values-ja/strings.xml

@@ -53,4 +53,17 @@
         <item quantity="one">1 イベントを削除しました</item>
         <item quantity="other">%1$d イベントを削除しました</item>
     </plurals>
+
+    <string name="january">January</string>
+    <string name="february">February</string>
+    <string name="march">March</string>
+    <string name="april">April</string>
+    <string name="may">May</string>
+    <string name="june">June</string>
+    <string name="july">July</string>
+    <string name="august">August</string>
+    <string name="september">September</string>
+    <string name="october">October</string>
+    <string name="november">November</string>
+    <string name="december">December</string>
 </resources>

app/src/main/res/values-sv/strings.xml

@@ -53,4 +53,17 @@
         <item quantity="one">1 händelse borttagen</item>
         <item quantity="other">%1$d händelser borttagna</item>
     </plurals>
+
+    <string name="january">Januari</string>
+    <string name="february">Februari</string>
+    <string name="march">Mars</string>
+    <string name="april">April</string>
+    <string name="may">Maj</string>
+    <string name="june">Juni</string>
+    <string name="july">Juli</string>
+    <string name="august">Augusti</string>
+    <string name="september">September</string>
+    <string name="october">Oktober</string>
+    <string name="november">November</string>
+    <string name="december">December</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -60,4 +60,33 @@
         <item quantity="one">1 event deleted</item>
         <item quantity="other">%1$d events deleted</item>
     </plurals>
+
+    <string name="january">January</string>
+    <string name="february">February</string>
+    <string name="march">March</string>
+    <string name="april">April</string>
+    <string name="may">May</string>
+    <string name="june">June</string>
+    <string name="july">July</string>
+    <string name="august">August</string>
+    <string name="september">September</string>
+    <string name="october">October</string>
+    <string name="november">November</string>
+    <string name="december">December</string>
+
+    <string-array name="months" translatable="false">
+        <item>@string/january</item>
+        <item>@string/february</item>
+        <item>@string/march</item>
+        <item>@string/april</item>
+        <item>@string/may</item>
+        <item>@string/june</item>
+        <item>@string/july</item>
+        <item>@string/august</item>
+        <item>@string/september</item>
+        <item>@string/october</item>
+        <item>@string/november</item>
+        <item>@string/december</item>
+    </string-array>
+
 </resources>