diff --git a/src/main/java/eu/siacs/conversations/Config.java b/src/main/java/eu/siacs/conversations/Config.java
index 698c403f..90e4a899 100644
--- a/src/main/java/eu/siacs/conversations/Config.java
+++ b/src/main/java/eu/siacs/conversations/Config.java
@@ -24,7 +24,7 @@ public final class Config {
 
 	public static final boolean NO_PROXY_LOOKUP = false; //useful to debug ibb
 
-	private static final long MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
+	public static final long MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
 	public static final long MAM_MAX_CATCHUP =  MILLISECONDS_IN_DAY / 2;
 	public static final int MAM_MAX_MESSAGES = 500;
 
diff --git a/src/main/java/eu/siacs/conversations/services/NotificationService.java b/src/main/java/eu/siacs/conversations/services/NotificationService.java
index 9e21d160..c27ab72a 100644
--- a/src/main/java/eu/siacs/conversations/services/NotificationService.java
+++ b/src/main/java/eu/siacs/conversations/services/NotificationService.java
@@ -72,20 +72,15 @@ public class NotificationService {
 		if (!mXmppConnectionService.getPreferences().getBoolean("enable_quiet_hours", false)) {
 			return false;
 		}
-		final Calendar startTime = Calendar.getInstance();
-		startTime.setTimeInMillis(mXmppConnectionService.getPreferences().getLong("quiet_hours_start", TimePreference.DEFAULT_VALUE));
-		final Calendar endTime = Calendar.getInstance();
-		endTime.setTimeInMillis(mXmppConnectionService.getPreferences().getLong("quiet_hours_end", TimePreference.DEFAULT_VALUE));
-		final Calendar nowTime = Calendar.getInstance();
+		final long startTime = mXmppConnectionService.getPreferences().getLong("quiet_hours_start", TimePreference.DEFAULT_VALUE) % Config.MILLISECONDS_IN_DAY;
+		final long endTime = mXmppConnectionService.getPreferences().getLong("quiet_hours_end", TimePreference.DEFAULT_VALUE) % Config.MILLISECONDS_IN_DAY;
+		final long nowTime = Calendar.getInstance().getTimeInMillis() % Config.MILLISECONDS_IN_DAY;
 
-		startTime.set(nowTime.get(Calendar.YEAR), nowTime.get(Calendar.MONTH), nowTime.get(Calendar.DATE));
-		endTime.set(nowTime.get(Calendar.YEAR), nowTime.get(Calendar.MONTH), nowTime.get(Calendar.DATE));
-
-		if (endTime.before(startTime)) {
-			endTime.add(Calendar.DATE, 1);
+		if (endTime < startTime) {
+			return nowTime > startTime || nowTime < endTime;
+		} else {
+			return nowTime > startTime && nowTime < endTime;
 		}
-
-		return nowTime.after(startTime) && nowTime.before(endTime);
 	}
 
 	public boolean conferenceNotificationsEnabled() {
diff --git a/src/main/java/eu/siacs/conversations/ui/TimePreference.java b/src/main/java/eu/siacs/conversations/ui/TimePreference.java
index 44a36224..e32b068c 100644
--- a/src/main/java/eu/siacs/conversations/ui/TimePreference.java
+++ b/src/main/java/eu/siacs/conversations/ui/TimePreference.java
@@ -3,6 +3,7 @@ package eu.siacs.conversations.ui;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.preference.DialogPreference;
+import android.preference.Preference;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.TimePicker;
@@ -11,12 +12,13 @@ import java.text.DateFormat;
 import java.util.Calendar;
 import java.util.Date;
 
-public class TimePreference extends DialogPreference {
+public class TimePreference extends DialogPreference implements Preference.OnPreferenceChangeListener {
 	private TimePicker picker = null;
 	public final static long DEFAULT_VALUE = 0;
 
 	public TimePreference(final Context context, final AttributeSet attrs) {
 		super(context, attrs, 0);
+		this.setOnPreferenceChangeListener(this);
 	}
 
 	protected void setTime(final long time) {
@@ -25,8 +27,7 @@ public class TimePreference extends DialogPreference {
 		notifyChanged();
 	}
 
-	protected void updateSummary() {
-		final long time = getPersistedLong(DEFAULT_VALUE);
+	protected void updateSummary(final long time) {
 		final DateFormat dateFormat = android.text.format.DateFormat.getTimeFormat(getContext());
 		final Date date = new Date(time);
 		setSummary(dateFormat.format(date.getTime()));
@@ -71,7 +72,6 @@ public class TimePreference extends DialogPreference {
 			}
 
 			setTime(c.getTimeInMillis());
-			updateSummary();
 		}
 	}
 
@@ -94,6 +94,12 @@ public class TimePreference extends DialogPreference {
 		}
 
 		setTime(time);
-		updateSummary();
+		updateSummary(time);
+	}
+
+	@Override
+	public boolean onPreferenceChange(final Preference preference, final Object newValue) {
+		((TimePreference) preference).updateSummary((Long)newValue);
+		return true;
 	}
 }