diff --git a/app/src/main/java/org/isoron/uhabits/helpers/DateHelper.java b/app/src/main/java/org/isoron/uhabits/helpers/DateHelper.java
index 5d6685984..4d0c02c32 100644
--- a/app/src/main/java/org/isoron/uhabits/helpers/DateHelper.java
+++ b/app/src/main/java/org/isoron/uhabits/helpers/DateHelper.java
@@ -28,9 +28,7 @@ import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.GregorianCalendar;
-import java.util.HashMap;
 import java.util.Locale;
-import java.util.Map;
 import java.util.TimeZone;
 
 public class DateHelper
@@ -159,37 +157,13 @@ public class DateHelper
 
 
     /**
-     * Throughout the code, it is assumed that the weekdays are numbered
-     * from 0 (Saturday) to 6 (Friday).
-     *
-     * see https://github.com/iSoron/uhabits/issues/74
-     *
-     * In the Java Calendar they are numbered from 1 (Sunday) to 7 (Saturday)
-     *
-     * <table>
-     * <thead>
-     * <tr><th>day</th><th>dayNumber</th><th>wdaysIndex</th></tr>
-     * <thead>
-     * <tbody>
-     * <tr><td>Su</td><td>1</td><td>1</td></tr>
-     * <tr><td>Mo</td><td>2</td><td>2</td></tr>
-     * <tr><td>Tu</td><td>3</td><td>3</td></tr>
-     * <tr><td>We</td><td>4</td><td>4</td></tr>
-     * <tr><td>Th</td><td>5</td><td>5</td></tr>
-     * <tr><td>Fr</td><td>6</td><td>6</td></tr>
-     * <tr><td>Sa</td><td>7</td><td>0</td></tr>
-     * </tbody>
-     * </table>
-     *
-     * So we have {@code wdaysIndex = dayNumber % 7}
+     * Throughout the code, it is assumed that the weekdays are numbered from 0 (Saturday) to 6
+     * (Friday). In the Java Calendar they are numbered from 1 (Sunday) to 7 (Saturday). This
+     * function converts from Java to our internal representation.
      *
      * @return weekday number in the internal interpretation
-     *
-     * @see #getWeekday(long)
-     * @see java.util.Calendar#SUNDAY
-     *
      */
-    public static int weekDayNumber2wdays(int number)
+    public static int javaWeekdayToLoopWeekday(int number)
     {
         return number % 7;
     }
@@ -199,26 +173,21 @@ public class DateHelper
         String[] wdays = new String[7];
 
         Calendar day = new GregorianCalendar();
-        // we start with Saturday
         day.set(GregorianCalendar.DAY_OF_WEEK, Calendar.SATURDAY);
 
         for (int i = 0; i < wdays.length; i++)
         {
             wdays[i] = day.getDisplayName(GregorianCalendar.DAY_OF_WEEK, format,
                     Locale.getDefault());
-            // advance in time by one day
             day.add(GregorianCalendar.DAY_OF_MONTH, 1);
         }
 
         return wdays;
     }
 
-
     /**
-     *
      * @return array with weekday names starting according to locale settings,
      * e.g. [Mo,Di,Mi,Do,Fr,Sa,So] in Europe
-     *
      */
     public static String[] getLocaleDayNames(int format)
     {
@@ -230,7 +199,6 @@ public class DateHelper
         {
             days[i] = calendar.getDisplayName(GregorianCalendar.DAY_OF_WEEK, format,
                     Locale.getDefault());
-            // advance in time by one day
             calendar.add(GregorianCalendar.DAY_OF_MONTH, 1);
         }
 
@@ -238,42 +206,22 @@ public class DateHelper
     }
 
     /**
-     *
      * @return array with week days numbers starting according to locale settings,
      * e.g. [2,3,4,5,6,7,1] in Europe
-     *
-     * @see java.util.Calendar#SUNDAY
-     *
      */
     public static Integer[] getLocaleWeekdayList()
     {
         Integer[] dayNumbers = new Integer[7];
-        // a dummy calendar
         Calendar calendar = new GregorianCalendar();
-        // set staring day according to locale
         calendar.set(GregorianCalendar.DAY_OF_WEEK, calendar.getFirstDayOfWeek());
-        for (int i = 0; i < dayNumbers.length; i++) {
+        for (int i = 0; i < dayNumbers.length; i++)
+        {
             dayNumbers[i] = calendar.get(GregorianCalendar.DAY_OF_WEEK);
-            // advance in time by one day
             calendar.add(GregorianCalendar.DAY_OF_MONTH, 1);
         }
         return dayNumbers;
     }
 
-    /**
-     * here we create the mapping of week days numbers into the "wdays"-indices
-     *
-     * @see DateHelper#getDayNames(int)
-     */
-    public static Map<Integer, Integer> getWeekdayMap()
-    {
-        Map<Integer, Integer> number2wdays = new HashMap<>();
-        for (Integer number : getLocaleWeekdayList()) {
-            number2wdays.put(number, number % 7);
-        }
-        return number2wdays;
-    }
-
     public static String formatWeekdayList(Context context, boolean weekday[])
     {
         String shortDayNames[] = getShortDayNames();
diff --git a/app/src/main/java/org/isoron/uhabits/views/HabitFrequencyView.java b/app/src/main/java/org/isoron/uhabits/views/HabitFrequencyView.java
index 2da6d6e51..86a239b36 100644
--- a/app/src/main/java/org/isoron/uhabits/views/HabitFrequencyView.java
+++ b/app/src/main/java/org/isoron/uhabits/views/HabitFrequencyView.java
@@ -35,7 +35,6 @@ import java.util.Calendar;
 import java.util.Date;
 import java.util.GregorianCalendar;
 import java.util.HashMap;
-import java.util.Map;
 import java.util.Random;
 
 public class HabitFrequencyView extends ScrollableDataView implements HabitDataView
@@ -234,7 +233,7 @@ public class HabitFrequencyView extends ScrollableDataView implements HabitDataV
             rect.set(0, 0, baseSize, baseSize);
             rect.offset(prevRect.left, prevRect.top + columnWidth * j);
 
-            int i = DateHelper.weekDayNumber2wdays(localeWeekdayList[j]);
+            int i = DateHelper.javaWeekdayToLoopWeekday(localeWeekdayList[j]);
             if(values != null)
                 drawMarker(canvas, rect, values[i]);
 
diff --git a/app/src/main/java/org/isoron/uhabits/views/HabitHistoryView.java b/app/src/main/java/org/isoron/uhabits/views/HabitHistoryView.java
index 05315ef16..95fb83a42 100644
--- a/app/src/main/java/org/isoron/uhabits/views/HabitHistoryView.java
+++ b/app/src/main/java/org/isoron/uhabits/views/HabitHistoryView.java
@@ -40,7 +40,6 @@ import org.isoron.uhabits.tasks.ToggleRepetitionTask;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
-import java.util.Map;
 import java.util.Random;
 
 public class HabitHistoryView extends ScrollableDataView implements HabitDataView,
@@ -277,7 +276,8 @@ public class HabitHistoryView extends ScrollableDataView implements HabitDataVie
         {
             if (!(column == nColumns - 2 && getDataOffset() == 0 && j > todayPositionInColumn))
             {
-                int checkmarkOffset = getDataOffset() * 7 + nDays - 7 * (column + 1) + todayPositionInColumn - j;
+                int checkmarkOffset = getDataOffset() * 7 + nDays - 7 * (column + 1) +
+                        todayPositionInColumn - j;
                 drawSquare(canvas, location, date, checkmarkOffset);
             }