diff --git a/app/build.gradle b/app/build.gradle
index ea54e3ac3b..00abdd64a0 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -188,4 +188,6 @@ dependencies {
     compile 'com.google.code.gson:gson:2.7'
     compile 'com.google.guava:guava:20.0'
 
+    compile 'net.danlew:android.joda:2.9.9.1'
+    testCompile 'joda-time:joda-time:2.9.4.2'
 }
diff --git a/app/src/main/java/info/nightscout/androidaps/MainApp.java b/app/src/main/java/info/nightscout/androidaps/MainApp.java
index bd0ba7695e..4bba16080b 100644
--- a/app/src/main/java/info/nightscout/androidaps/MainApp.java
+++ b/app/src/main/java/info/nightscout/androidaps/MainApp.java
@@ -15,6 +15,8 @@ import com.squareup.otto.Bus;
 import com.squareup.otto.LoggingBus;
 import com.squareup.otto.ThreadEnforcer;
 
+import net.danlew.android.joda.JodaTimeAndroid;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -96,6 +98,7 @@ public class MainApp extends Application {
         super.onCreate();
         Fabric.with(this, new Crashlytics());
         Fabric.with(this, new Answers());
+        JodaTimeAndroid.init(this);
         Crashlytics.setString("BUILDVERSION", BuildConfig.BUILDVERSION);
         log.info("Version: " + BuildConfig.VERSION_NAME);
         log.info("BuildVersion: " + BuildConfig.BUILDVERSION);
diff --git a/app/src/main/java/info/nightscout/utils/DateUtil.java b/app/src/main/java/info/nightscout/utils/DateUtil.java
index 68d28760d3..86965621d2 100644
--- a/app/src/main/java/info/nightscout/utils/DateUtil.java
+++ b/app/src/main/java/info/nightscout/utils/DateUtil.java
@@ -2,10 +2,12 @@ package info.nightscout.utils;
 
 import android.support.v4.util.LongSparseArray;
 import android.text.format.DateUtils;
-import android.util.SparseIntArray;
+
+import org.joda.time.DateTime;
+import org.joda.time.format.DateTimeFormatter;
+import org.joda.time.format.ISODateTimeFormat;
 
 import java.text.DateFormat;
-import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
@@ -29,10 +31,6 @@ public class DateUtil {
      */
     private static String FORMAT_DATE_ISO_OUT = "yyyy-MM-dd'T'HH:mm:ss'Z'";
 
-    private static String FORMAT_DATE_ISO = "yyyy-MM-dd'T'HH:mm:ssZ";
-    private static String FORMAT_DATE_ISO_MSEC = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
-    private static String FORMAT_DATE_ISO_MSEC_UTC = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
-
     /**
      * Takes in an ISO date string of the following format:
      * yyyy-mm-ddThh:mm:ss.ms+HoMo
@@ -43,33 +41,10 @@ public class DateUtil {
      */
     public static Date fromISODateString(String isoDateString)
             throws Exception {
-        SimpleDateFormat f = new SimpleDateFormat(FORMAT_DATE_ISO, Locale.getDefault());
-        Date date;
 
-        f.setTimeZone(TimeZone.getTimeZone("UTC"));
-        try {
-            date = f.parse(isoDateString);
-            return date;
-        } catch (ParseException e) {
-        }
-
-        f = new SimpleDateFormat(FORMAT_DATE_ISO_MSEC, Locale.getDefault());
-        f.setTimeZone(TimeZone.getTimeZone("UTC"));
-        try {
-            date = f.parse(isoDateString);
-            return date;
-        } catch (ParseException e) {
-        }
-
-        f = new SimpleDateFormat(FORMAT_DATE_ISO_MSEC_UTC, Locale.getDefault());
-        f.setTimeZone(TimeZone.getTimeZone("UTC"));
-        try {
-            date = f.parse(isoDateString);
-            return date;
-        } catch (ParseException e) {
-        }
-
-        throw new ParseException("Unparseable date: " + isoDateString, 0);
+        DateTimeFormatter parser = ISODateTimeFormat.dateTimeParser();
+        DateTime dateTime = DateTime.parse(isoDateString, parser);
+        return dateTime.toDate();
     }
 
     /**
@@ -99,11 +74,8 @@ public class DateUtil {
     public static Date toDate(Integer seconds) {
         Calendar calendar = new GregorianCalendar();
         calendar.set(Calendar.HOUR_OF_DAY, seconds / 60 / 60);
-        String a = calendar.getTime().toString();
         calendar.set(Calendar.MINUTE, (seconds / 60) % 60);
-        String b = calendar.getTime().toString();
         calendar.set(Calendar.SECOND, 0);
-        String c = calendar.getTime().toString();
         return calendar.getTime();
     }
 
diff --git a/app/src/test/java/info/nightscout/utils/DateUtilTest.java b/app/src/test/java/info/nightscout/utils/DateUtilTest.java
index 4b48148341..d720487201 100644
--- a/app/src/test/java/info/nightscout/utils/DateUtilTest.java
+++ b/app/src/test/java/info/nightscout/utils/DateUtilTest.java
@@ -3,7 +3,9 @@ package info.nightscout.utils;
 
 import org.junit.Test;
 
-import static org.junit.Assert.*;
+import java.util.Date;
+
+import static org.junit.Assert.assertEquals;
 
 /**
  * Created by mike on 20.11.2017.
@@ -17,10 +19,15 @@ public class DateUtilTest {
 
     @Test
     public void fromISODateStringTest() throws Exception {
-        assertEquals( 1511124634417L, DateUtil.fromISODateString("2017-11-19T22:50:34.417+0200").getTime());
-        assertEquals( 1511124634000L, DateUtil.fromISODateString("2017-11-19T22:50:34+0200").getTime());
-        assertEquals( 1512317365000L, DateUtil.fromISODateString("2017-12-03T16:09:25.000Z").getTime());
+        assertEquals(1511124634417L, DateUtil.fromISODateString("2017-11-19T22:50:34.417+0200").getTime());
+        assertEquals(1511124634000L, DateUtil.fromISODateString("2017-11-19T22:50:34+0200").getTime());
+        assertEquals(1512317365000L, DateUtil.fromISODateString("2017-12-03T16:09:25.000Z").getTime());
+        assertEquals(1513902750000L, DateUtil.fromISODateString("2017-12-22T00:32:30Z").getTime());
     }
 
+    @Test
+    public void toISOStringTest() throws Exception {
+        assertEquals("2017-12-22T00:32:30Z", DateUtil.toISOString(new Date(1513902750000L)));
+    }
 
 }