diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
index 7b04a82d7..2ac909614 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
@@ -123,7 +123,7 @@ public class GBApplication extends Application {
     private static SharedPreferences sharedPrefs;
     private static final String PREFS_VERSION = "shared_preferences_version";
     //if preferences have to be migrated, increment the following and add the migration logic in migratePrefs below; see http://stackoverflow.com/questions/16397848/how-can-i-migrate-android-preferences-with-a-new-version
-    private static final int CURRENT_PREFS_VERSION = 37;
+    private static final int CURRENT_PREFS_VERSION = 38;
 
     private static final LimitedQueue<Integer, String> mIDSenderLookup = new LimitedQueue<>(16);
     private static GBPrefs prefs;
@@ -735,7 +735,7 @@ public class GBApplication extends Application {
                 editor.remove("mi_user_weight_kg");
             }
             if (legacyYOB != null) {
-                editor.putString(ActivityUser.PREF_USER_YEAR_OF_BIRTH, legacyYOB);
+                editor.putString("activity_user_year_of_birth", legacyYOB);
                 editor.remove("mi_user_year_of_birth");
             }
         }
@@ -1726,6 +1726,14 @@ public class GBApplication extends Application {
             }
         }
 
+        if (oldVersion < 38) {
+            // Migrate year of birth to date of birth
+            final String yearOfBirth = sharedPrefs.getString("activity_user_year_of_birth", null);
+            if (StringUtils.isNotBlank(yearOfBirth)) {
+                editor.putString("activity_user_date_of_birth", String.format(Locale.ROOT, "%s-01-01", yearOfBirth.trim()));
+            }
+        }
+
         editor.putString(PREFS_VERSION, Integer.toString(CURRENT_PREFS_VERSION));
         editor.apply();
     }
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/AboutUserPreferencesActivity.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/AboutUserPreferencesActivity.java
index 914a76763..ca6dea58f 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/AboutUserPreferencesActivity.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/AboutUserPreferencesActivity.java
@@ -18,6 +18,7 @@ package nodomain.freeyourgadget.gadgetbridge.activities;
 
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_ACTIVETIME_MINUTES;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_CALORIES_BURNT;
+import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_DATE_OF_BIRTH;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_DISTANCE_METERS;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_GENDER;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_GOAL_FAT_BURN_TIME_MINUTES;
@@ -29,7 +30,6 @@ import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_STEPS_GOAL;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_STEP_LENGTH_CM;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_WEIGHT_KG;
-import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_YEAR_OF_BIRTH;
 
 import android.content.Intent;
 import android.os.Bundle;
@@ -62,7 +62,7 @@ public class AboutUserPreferencesActivity extends AbstractSettingsActivityV2 {
             setPreferencesFromResource(R.xml.about_user, rootKey);
 
             addPreferenceHandlerFor(PREF_USER_NAME, true, false);
-            addPreferenceHandlerFor(PREF_USER_YEAR_OF_BIRTH, true, false);
+            addPreferenceHandlerFor(PREF_USER_DATE_OF_BIRTH, true, false);
             addPreferenceHandlerFor(PREF_USER_HEIGHT_CM, true, true);
             addPreferenceHandlerFor(PREF_USER_WEIGHT_KG, true, false);
             addPreferenceHandlerFor(PREF_USER_GENDER, true, false);
@@ -74,7 +74,6 @@ public class AboutUserPreferencesActivity extends AbstractSettingsActivityV2 {
             addPreferenceHandlerFor(PREF_USER_STEP_LENGTH_CM, false, true);
             addPreferenceHandlerFor(PREF_USER_DISTANCE_METERS, false, true);
 
-            setInputTypeFor(PREF_USER_YEAR_OF_BIRTH, InputType.TYPE_CLASS_NUMBER);
             setInputTypeFor(PREF_USER_HEIGHT_CM, InputType.TYPE_CLASS_NUMBER);
             setInputTypeFor(PREF_USER_WEIGHT_KG, InputType.TYPE_CLASS_NUMBER);
             setInputTypeFor(PREF_USER_STEPS_GOAL, InputType.TYPE_CLASS_NUMBER);
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/ActivityUser.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/ActivityUser.java
index e4765119f..e9f218a68 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/ActivityUser.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/model/ActivityUser.java
@@ -17,6 +17,8 @@
     along with this program.  If not, see <https://www.gnu.org/licenses/>. */
 package nodomain.freeyourgadget.gadgetbridge.model;
 
+import java.time.LocalDate;
+import java.time.Period;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.GregorianCalendar;
@@ -36,7 +38,7 @@ public class ActivityUser {
 
     private String activityUserName;
     private int activityUserGender;
-    private int activityUserYearOfBirth;
+    private LocalDate activityUserDateOfBirth;
     private int activityUserHeightCm;
     private int activityUserWeightKg;
     private int activityUserSleepDurationGoal;
@@ -49,7 +51,7 @@ public class ActivityUser {
 
     private static final String defaultUserName = "gadgetbridge-user";
     public static final int defaultUserGender = GENDER_FEMALE;
-    public static final int defaultUserYearOfBirth = 1970;
+    public static final String defaultUserDateOfBirth = "1970-01-01";
     public static final int defaultUserAge = 0;
     public static final int defaultUserHeightCm = 175;
     public static final int defaultUserWeightKg = 70;
@@ -64,7 +66,7 @@ public class ActivityUser {
     public static final int defaultUserFatBurnTimeMinutes = 30;
 
     public static final String PREF_USER_NAME = "mi_user_alias";
-    public static final String PREF_USER_YEAR_OF_BIRTH = "activity_user_year_of_birth";
+    public static final String PREF_USER_DATE_OF_BIRTH = "activity_user_date_of_birth";
     public static final String PREF_USER_GENDER = "activity_user_gender";
     public static final String PREF_USER_HEIGHT_CM = "activity_user_height_cm";
     public static final String PREF_USER_WEIGHT_KG = "activity_user_weight_kg";
@@ -99,8 +101,8 @@ public class ActivityUser {
         return activityUserGender;
     }
 
-    public int getYearOfBirth() {
-        return activityUserYearOfBirth;
+    public LocalDate getDateOfBirth() {
+        return activityUserDateOfBirth;
     }
 
     /**
@@ -145,15 +147,7 @@ public class ActivityUser {
     }
 
     public int getAge() {
-        int userYear = getYearOfBirth();
-        int age = 25;
-        if (userYear > 1900) {
-            age = Calendar.getInstance().get(Calendar.YEAR) - userYear;
-            if (age <= 0) {
-                age = 25;
-            }
-        }
-        return age;
+        return Period.between(getDateOfBirth(), LocalDate.now()).getYears();
     }
 
     private void fetchPreferences() {
@@ -162,7 +156,7 @@ public class ActivityUser {
         activityUserGender = prefs.getInt(PREF_USER_GENDER, defaultUserGender);
         activityUserHeightCm = prefs.getInt(PREF_USER_HEIGHT_CM, defaultUserHeightCm);
         activityUserWeightKg = prefs.getInt(PREF_USER_WEIGHT_KG, defaultUserWeightKg);
-        activityUserYearOfBirth = prefs.getInt(PREF_USER_YEAR_OF_BIRTH, defaultUserYearOfBirth);
+        activityUserDateOfBirth = prefs.getLocalDate(PREF_USER_DATE_OF_BIRTH, defaultUserDateOfBirth);
         activityUserSleepDurationGoal = prefs.getInt(PREF_USER_SLEEP_DURATION, defaultUserSleepDurationGoal);
         activityUserStepsGoal = prefs.getInt(PREF_USER_STEPS_GOAL, defaultUserStepsGoal);
         activityUserCaloriesBurntGoal = prefs.getInt(PREF_USER_CALORIES_BURNT, defaultUserCaloriesBurntGoal);
@@ -172,9 +166,16 @@ public class ActivityUser {
         activityUserStepLengthCm = prefs.getInt(PREF_USER_STEP_LENGTH_CM, defaultUserStepLengthCm);
     }
 
+    /**
+     * @deprecated use {@link #getDateOfBirth()}.
+     */
+    @Deprecated
     public Date getUserBirthday() {
+        final LocalDate dateOfBirth = getDateOfBirth();
         Calendar cal = DateTimeUtils.getCalendarUTC();
-        cal.set(GregorianCalendar.YEAR, getYearOfBirth());
+        cal.set(GregorianCalendar.YEAR, dateOfBirth.getYear());
+        cal.set(GregorianCalendar.MONTH, dateOfBirth.getMonthValue() - 1);
+        cal.set(GregorianCalendar.DAY_OF_MONTH, dateOfBirth.getDayOfMonth());
         return cal.getTime();
     }
 
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java
index 31efb77b4..0626da017 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/CasioGBX100DeviceSupport.java
@@ -69,12 +69,12 @@ import static nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.Dev
 import static nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst.PREF_PREVIEW_MESSAGE_IN_TITLE;
 import static nodomain.freeyourgadget.gadgetbridge.activities.devicesettings.DeviceSettingsPreferenceConst.PREF_TIMEFORMAT;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_ACTIVETIME_MINUTES;
+import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_DATE_OF_BIRTH;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_DISTANCE_METERS;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_GENDER;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_HEIGHT_CM;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_STEPS_GOAL;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_WEIGHT_KG;
-import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_YEAR_OF_BIRTH;
 
 public class CasioGBX100DeviceSupport extends Casio2C2DSupport implements SharedPreferences.OnSharedPreferenceChangeListener {
     private static final Logger LOG = LoggerFactory.getLogger(CasioGBX100DeviceSupport.class);
@@ -676,7 +676,7 @@ public class CasioGBX100DeviceSupport extends Casio2C2DSupport implements Shared
                 case PREF_USER_WEIGHT_KG:
                     new SetConfigurationOperation(this, CasioConstants.ConfigurationOption.OPTION_WEIGHT).perform();
                     break;
-                case PREF_USER_YEAR_OF_BIRTH:
+                case PREF_USER_DATE_OF_BIRTH:
                     new SetConfigurationOperation(this, CasioConstants.ConfigurationOption.OPTION_BIRTHDAY).perform();
                     break;
                 case PREF_TIMEFORMAT:
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/SetConfigurationOperation.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/SetConfigurationOperation.java
index 3dd4650e8..02e3c3f95 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/SetConfigurationOperation.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/casio/gbx100/SetConfigurationOperation.java
@@ -24,6 +24,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.time.LocalDate;
 import java.util.Arrays;
 import java.util.UUID;
 
@@ -120,10 +121,10 @@ public class SetConfigurationOperation  extends AbstractBTLEOperation<CasioGBX10
                     }
                 }
                 if(option == CasioConstants.ConfigurationOption.OPTION_BIRTHDAY || all) {
-                    int year = user.getYearOfBirth();
-                    // Month and Day are not configured in Gadgetbridge!
-                    int month = 1;
-                    int day = 1;
+                    LocalDate dateOfBirth = user.getDateOfBirth();
+                    int year = dateOfBirth.getYear();
+                    int month = dateOfBirth.getMonthValue();
+                    int day = dateOfBirth.getDayOfMonth();
                     data[6] = BcdUtil.toBcd8(year % 100);
                     data[7] = BcdUtil.toBcd8((year - (year % 100)) / 100);
                     data[8] = BcdUtil.toBcd8(month);
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/fitpro/FitProDeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/fitpro/FitProDeviceSupport.java
index 1c45b5848..debd698d7 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/fitpro/FitProDeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/fitpro/FitProDeviceSupport.java
@@ -491,7 +491,7 @@ public class FitProDeviceSupport extends AbstractBTLEDeviceSupport {
                 case ActivityUser.PREF_USER_WEIGHT_KG:
                 case ActivityUser.PREF_USER_GENDER:
                 case ActivityUser.PREF_USER_HEIGHT_CM:
-                case ActivityUser.PREF_USER_YEAR_OF_BIRTH:
+                case ActivityUser.PREF_USER_DATE_OF_BIRTH:
                     setUserData(builder);
                     break;
                 case ActivityUser.PREF_USER_STEPS_GOAL:
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/hama/fit6900/HamaFit6900DeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/hama/fit6900/HamaFit6900DeviceSupport.java
index 35e3a58d2..2327c7627 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/hama/fit6900/HamaFit6900DeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/hama/fit6900/HamaFit6900DeviceSupport.java
@@ -123,7 +123,7 @@ public final class HamaFit6900DeviceSupport extends AbstractBTLEDeviceSupport {
             case ActivityUser.PREF_USER_WEIGHT_KG:
             case ActivityUser.PREF_USER_GENDER:
             case ActivityUser.PREF_USER_HEIGHT_CM:
-            case ActivityUser.PREF_USER_YEAR_OF_BIRTH:
+            case ActivityUser.PREF_USER_DATE_OF_BIRTH:
             case DeviceSettingsPreferenceConst.PREF_USER_FITNESS_GOAL:
                 sendMessage("update-user-info", makeSetUserInfoMessage());
                 return;
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/HuamiSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/HuamiSupport.java
index d1c5b4d95..72db1a0d0 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/HuamiSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/HuamiSupport.java
@@ -48,6 +48,7 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.charset.StandardCharsets;
 import java.time.Instant;
+import java.time.LocalDate;
 import java.time.ZoneId;
 import java.time.zone.ZoneOffsetTransition;
 import java.time.zone.ZoneRules;
@@ -285,11 +286,11 @@ import static nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandConst.VI
 import static nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandConst.VIBRATION_PROFILE;
 import static nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandConst.getNotificationPrefIntValue;
 import static nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandConst.getNotificationPrefStringValue;
+import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_DATE_OF_BIRTH;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_GENDER;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_HEIGHT_CM;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_NAME;
 import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_WEIGHT_KG;
-import static nodomain.freeyourgadget.gadgetbridge.model.ActivityUser.PREF_USER_YEAR_OF_BIRTH;
 import static nodomain.freeyourgadget.gadgetbridge.service.btle.GattCharacteristic.UUID_CHARACTERISTIC_ALERT_LEVEL;
 
 public abstract class HuamiSupport extends AbstractBTLEDeviceSupport implements Huami2021Handler {
@@ -646,9 +647,10 @@ public abstract class HuamiSupport extends AbstractBTLEDeviceSupport implements
         ActivityUser activityUser = new ActivityUser();
         int height = activityUser.getHeightCm();
         int weight = activityUser.getWeightKg();
-        int birth_year = activityUser.getYearOfBirth();
-        byte birth_month = 7; // not in user attributes
-        byte birth_day = 1; // not in user attributes
+        LocalDate dateOfBirth = activityUser.getDateOfBirth();
+        int birth_year = dateOfBirth.getYear();
+        byte birth_month = (byte) dateOfBirth.getMonthValue();
+        byte birth_day = (byte) dateOfBirth.getDayOfMonth();
 
         if (alias == null || weight == 0 || height == 0 || birth_year == 0) {
             LOG.warn("Unable to set user info, make sure it is set up");
@@ -2914,8 +2916,8 @@ public abstract class HuamiSupport extends AbstractBTLEDeviceSupport implements
                 case PREF_SOUNDS:
                     setBeepSounds(builder);
                     break;
+                case PREF_USER_DATE_OF_BIRTH:
                 case PREF_USER_NAME:
-                case PREF_USER_YEAR_OF_BIRTH:
                 case PREF_USER_WEIGHT_KG:
                 case PREF_USER_HEIGHT_CM:
                 case PREF_USER_GENDER:
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/ZeppOsSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/ZeppOsSupport.java
index 11ab05e64..62695d282 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/ZeppOsSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/zeppos/ZeppOsSupport.java
@@ -61,6 +61,7 @@ import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.charset.StandardCharsets;
 import java.sql.Timestamp;
+import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
@@ -458,9 +459,10 @@ public class ZeppOsSupport extends HuamiSupport implements ZeppOsFileTransferSer
         final ActivityUser activityUser = new ActivityUser();
         final int height = activityUser.getHeightCm();
         final int weight = activityUser.getWeightKg();
-        final int birthYear = activityUser.getYearOfBirth();
-        final byte birthMonth = 7; // not in user attributes
-        final byte birthDay = 1; // not in user attributes
+        final LocalDate dateOfBirth = activityUser.getDateOfBirth();
+        final int birthYear = dateOfBirth.getYear();
+        final byte birthMonth = (byte) dateOfBirth.getMonthValue();
+        final byte birthDay = (byte) dateOfBirth.getDayOfMonth();
         final String region = devicePrefs.getString(DeviceSettingsPreferenceConst.PREF_DEVICE_REGION, "unknown");
 
         if (alias == null || weight == 0 || height == 0 || birthYear == 0) {
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HuaweiSupportProvider.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HuaweiSupportProvider.java
index b578e9e50..31f599c78 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HuaweiSupportProvider.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/HuaweiSupportProvider.java
@@ -1071,7 +1071,7 @@ public class HuaweiSupportProvider {
                 case ActivityUser.PREF_USER_WEIGHT_KG:
                 case ActivityUser.PREF_USER_HEIGHT_CM:
                 case ActivityUser.PREF_USER_GENDER:
-                case ActivityUser.PREF_USER_YEAR_OF_BIRTH:
+                case ActivityUser.PREF_USER_DATE_OF_BIRTH:
                     sendUserInfo();
                     break;
             }
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/requests/SendFitnessUserInfoRequest.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/requests/SendFitnessUserInfoRequest.java
index abf70fd19..0ac668731 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/requests/SendFitnessUserInfoRequest.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huawei/requests/SendFitnessUserInfoRequest.java
@@ -19,8 +19,7 @@ package nodomain.freeyourgadget.gadgetbridge.service.devices.huawei.requests;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.Calendar;
-import java.util.Date;
+import java.time.LocalDate;
 import java.util.List;
 
 import nodomain.freeyourgadget.gadgetbridge.devices.huawei.HuaweiPacket;
@@ -50,12 +49,10 @@ public class SendFitnessUserInfoRequest extends Request {
                 gender = 1;
             }
 
-            Date birthday = activityUser.getUserBirthday();
-            Calendar cal = Calendar.getInstance();
-            cal.setTime(birthday);
-            int birthdayEncoded = cal.get(Calendar.YEAR) << 16;
-            birthdayEncoded += (cal.get(Calendar.MONTH)+1) << 8;
-            birthdayEncoded += cal.get(Calendar.DAY_OF_MONTH);
+            LocalDate dateOfBirth = activityUser.getDateOfBirth();
+            int birthdayEncoded = dateOfBirth.getYear() << 16;
+            birthdayEncoded += dateOfBirth.getMonthValue() << 8;
+            birthdayEncoded += dateOfBirth.getDayOfMonth();
 
             return new UserInfo.Request(paramsProvider,
                     activityUser.getHeightCm(),
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/SonyWena3DeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/SonyWena3DeviceSupport.java
index 9d0d5512c..0a7dd9466 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/SonyWena3DeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/SonyWena3DeviceSupport.java
@@ -31,6 +31,7 @@ import java.io.IOException;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
@@ -843,7 +844,8 @@ public class SonyWena3DeviceSupport extends AbstractBTLEDeviceSupport {
     private void sendActivityGoalSettings(TransactionBuilder b) {
         Prefs prefs = new Prefs(GBApplication.getDeviceSpecificSharedPrefs(getDevice().getAddress()));
         ActivityUser user = new ActivityUser();
-        if(user.getYearOfBirth() < 1920) {
+        LocalDate dateOfBirth = user.getDateOfBirth();
+        if(dateOfBirth.getYear() < 1920) {
             LOG.error("Device does not support this year of birth");
             return;
         }
@@ -851,8 +853,16 @@ public class SonyWena3DeviceSupport extends AbstractBTLEDeviceSupport {
 
         GenderSetting gender = user.getGender() == ActivityUser.GENDER_FEMALE ? GenderSetting.FEMALE : GenderSetting.MALE;
 
+
         // Maybe we need to set the full birth date?
-        BodyPropertiesSetting bodyPropertiesSetting = new BodyPropertiesSetting(gender, (short)user.getYearOfBirth(), (short)0, (short)1, (short)user.getHeightCm(), (short)user.getWeightKg());
+        BodyPropertiesSetting bodyPropertiesSetting = new BodyPropertiesSetting(
+                gender,
+                (short)dateOfBirth.getYear(),
+                (short)dateOfBirth.getMonthValue(),
+                (short)dateOfBirth.getDayOfMonth(),
+                (short)user.getHeightCm(),
+                (short)user.getWeightKg()
+        );
         GoalStepsSetting stepsSetting = new GoalStepsSetting(stepsNotification, user.getStepsGoal());
 
         b.write(
@@ -1034,7 +1044,7 @@ public class SonyWena3DeviceSupport extends AbstractBTLEDeviceSupport {
                     sendHomeScreenSettings(builder);
                     break;
 
-                case ActivityUser.PREF_USER_YEAR_OF_BIRTH:
+                case ActivityUser.PREF_USER_DATE_OF_BIRTH:
                 case ActivityUser.PREF_USER_GENDER:
                 case ActivityUser.PREF_USER_HEIGHT_CM:
                 case ActivityUser.PREF_USER_WEIGHT_KG:
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/protocol/packets/settings/BodyPropertiesSetting.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/protocol/packets/settings/BodyPropertiesSetting.java
index a8d7f5953..798a35282 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/protocol/packets/settings/BodyPropertiesSetting.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/sony/wena3/protocol/packets/settings/BodyPropertiesSetting.java
@@ -25,15 +25,15 @@ import nodomain.freeyourgadget.gadgetbridge.service.devices.sony.wena3.protocol.
 public class BodyPropertiesSetting implements Wena3Packetable {
     public final GenderSetting gender;
     public final short yearOfBirth;
-    public final short monthOfBirthZeroIndexed;
+    public final short monthOfBirth;
     public final short dayOfBirth;
     public final short height;
     public final short weight;
 
-    public BodyPropertiesSetting(GenderSetting gender, short yearOfBirth, short monthOfBirthZeroIndexed, short dayOfBirth, short height, short weight) {
+    public BodyPropertiesSetting(GenderSetting gender, short yearOfBirth, short monthOfBirth, short dayOfBirth, short height, short weight) {
         this.gender = gender;
         this.yearOfBirth = yearOfBirth;
-        this.monthOfBirthZeroIndexed = monthOfBirthZeroIndexed;
+        this.monthOfBirth = monthOfBirth;
         this.dayOfBirth = dayOfBirth;
         this.height = height;
         this.weight = weight;
@@ -46,7 +46,7 @@ public class BodyPropertiesSetting implements Wena3Packetable {
                 .put((byte) 0x1D)
                 .put((byte) gender.ordinal())
                 .putShort(yearOfBirth)
-                .put((byte) (monthOfBirthZeroIndexed + 1)) // Java uses 0-indexed months
+                .put((byte) monthOfBirth)
                 .put((byte) dayOfBirth)
                 .putShort((short) (height * 10))
                 .putShort((short) (weight * 10))
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/xiaomi/services/XiaomiHealthService.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/xiaomi/services/XiaomiHealthService.java
index c8f695d50..47b57bb99 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/xiaomi/services/XiaomiHealthService.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/xiaomi/services/XiaomiHealthService.java
@@ -29,6 +29,7 @@ import org.slf4j.LoggerFactory;
 
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
+import java.time.LocalDate;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
@@ -209,7 +210,7 @@ public class XiaomiHealthService extends AbstractXiaomiService {
         switch (config) {
             case ActivityUser.PREF_USER_HEIGHT_CM:
             case ActivityUser.PREF_USER_WEIGHT_KG:
-            case ActivityUser.PREF_USER_YEAR_OF_BIRTH:
+            case ActivityUser.PREF_USER_DATE_OF_BIRTH:
             case ActivityUser.PREF_USER_GENDER:
             case ActivityUser.PREF_USER_CALORIES_BURNT:
             case ActivityUser.PREF_USER_STEPS_GOAL:
@@ -260,14 +261,14 @@ public class XiaomiHealthService extends AbstractXiaomiService {
         LOG.debug("Setting user info");
 
         final ActivityUser activityUser = new ActivityUser();
-        final int birthYear = activityUser.getYearOfBirth();
-        final byte birthMonth = 7; // not in user attributes
-        final byte birthDay = 1; // not in user attributes
+        final LocalDate dateOfBirth = activityUser.getDateOfBirth();
+        final int birthYear = dateOfBirth.getYear();
+        final byte birthMonth = (byte) dateOfBirth.getMonthValue();
+        final byte birthDay = (byte) dateOfBirth.getDayOfMonth();
 
         final int genderInt = activityUser.getGender() != ActivityUser.GENDER_FEMALE ? GENDER_MALE : GENDER_FEMALE;  // TODO other gender?
 
-        final Calendar now = GregorianCalendar.getInstance();
-        final int age = now.get(Calendar.YEAR) - birthYear;
+        final int age = activityUser.getAge();
         // Compute the approximate max heart rate from the user age
         // TODO max heart rate should be input by the user
         int maxHeartRate = (int) Math.round(age <= 40 ? 220 - age : 207 - 0.7 * age);
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/Prefs.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/Prefs.java
index 59376ea2d..c054600a5 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/Prefs.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/Prefs.java
@@ -21,6 +21,7 @@ import android.util.Log;
 
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
+import java.time.LocalDate;
 import java.time.LocalTime;
 import java.util.Arrays;
 import java.util.Calendar;
@@ -212,6 +213,24 @@ public class Prefs {
         return LocalTime.now();
     }
 
+    public LocalDate getLocalDate(final String key, final String defaultValue) {
+        final String time = getString(key, defaultValue);
+
+        final DateFormat df = new SimpleDateFormat("yyyy-MM-dd", Locale.ROOT);
+        try {
+            final Date parse = df.parse(time);
+            final Calendar calendar = GregorianCalendar.getInstance();
+            calendar.setTime(parse);
+
+            return LocalDate.of(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
+        } catch (final Exception e) {
+            Log.e(TAG, "Error reading localdate preference value: " + key + "; returning default current day", e); // log the first exception
+        }
+
+        return LocalDate.now();
+    }
+
+
     private void logReadError(String key, Exception ex) {
         Log.e(TAG, "Error reading preference value: " + key + "; returning default value", ex); // log the first exception
     }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c3752804c..c56ac7e43 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1160,6 +1160,7 @@
     <string name="waiting_for_reconnect">Waiting for reconnect</string>
     <string name="activity_prefs_about_you">About you</string>
     <string name="activity_prefs_goals">Goals</string>
+    <string name="activity_prefs_date_birth">Date of birth</string>
     <string name="activity_prefs_year_birth">Year of birth</string>
     <string name="activity_prefs_gender">Gender</string>
     <string name="activity_prefs_height_cm">Height in cm</string>
diff --git a/app/src/main/res/xml/about_user.xml b/app/src/main/res/xml/about_user.xml
index 452f9d07b..08d3f626a 100644
--- a/app/src/main/res/xml/about_user.xml
+++ b/app/src/main/res/xml/about_user.xml
@@ -13,13 +13,10 @@
             app:iconSpaceReserved="false"
             app:useSimpleSummaryProvider="true" />
 
-        <EditTextPreference
+        <nodomain.freeyourgadget.gadgetbridge.util.XDatePreference
             app:iconSpaceReserved="false"
-            android:inputType="number"
-            android:key="activity_user_year_of_birth"
-            android:maxLength="4"
-            android:title="@string/activity_prefs_year_birth"
-            app:useSimpleSummaryProvider="true" />
+            android:key="activity_user_date_of_birth"
+            android:title="@string/activity_prefs_date_birth" />
 
         <ListPreference
             app:iconSpaceReserved="false"