diff --git a/app/src/main/java/de/ccc/events/badge/card10/main/MainFragment.kt b/app/src/main/java/de/ccc/events/badge/card10/main/MainFragment.kt
index f9a429f8d622fafe464bd45617e1b7fcff3f1b2b..b9af4e11c9721e5fc6f21613c38f66c0f28a370a 100644
--- a/app/src/main/java/de/ccc/events/badge/card10/main/MainFragment.kt
+++ b/app/src/main/java/de/ccc/events/badge/card10/main/MainFragment.kt
@@ -29,6 +29,7 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.fragment.app.DialogFragment
 import androidx.fragment.app.Fragment
 import de.ccc.events.badge.card10.CARD10_BLUETOOTH_MAC_PREFIX
 import de.ccc.events.badge.card10.R
@@ -38,6 +39,7 @@ import de.ccc.events.badge.card10.hatchery.AppListFragment
 import de.ccc.events.badge.card10.mood.MoodFragment
 import de.ccc.events.badge.card10.scanner.ScannerFragment
 import de.ccc.events.badge.card10.sparkle.BeautifulFragment
+import de.ccc.events.badge.card10.time.TimeUpdateDialog
 import kotlinx.android.synthetic.main.main_fragment.*
 
 class MainFragment : Fragment() {
@@ -53,6 +55,13 @@ class MainFragment : Fragment() {
         button_hatchery.setOnClickListener { startFragment(AppListFragment()) }
         button_send.setOnClickListener { startFragment(FileTransferFragment()) }
 
+        button_set_time.setOnClickListener {
+            val dialogFragment = TimeUpdateDialog()
+            dialogFragment.show(fragmentManager, "time")
+            dialogFragment.setTime()
+            dialogFragment.dismiss()
+        }
+
         val bondedCard10s =
             bluetoothAdapter.bondedDevices.filter { it.address.startsWith(CARD10_BLUETOOTH_MAC_PREFIX, true) }
 
diff --git a/app/src/main/java/de/ccc/events/badge/card10/time/TimeUpdateDialog.kt b/app/src/main/java/de/ccc/events/badge/card10/time/TimeUpdateDialog.kt
new file mode 100644
index 0000000000000000000000000000000000000000..dbc488d6a1eb1d16ba18c9d7760ccbee91d42c8d
--- /dev/null
+++ b/app/src/main/java/de/ccc/events/badge/card10/time/TimeUpdateDialog.kt
@@ -0,0 +1,42 @@
+/*
+ * Copyright by the original author or authors.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package de.ccc.events.badge.card10.time
+
+import android.os.Bundle
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.fragment.app.DialogFragment
+import de.ccc.events.badge.card10.R
+import de.ccc.events.badge.card10.common.ConnectionService
+
+private const val TAG = "TimeUpdateDialog"
+
+class TimeUpdateDialog : DialogFragment() {
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) =
+        inflater.inflate(R.layout.time_update_dialog, container, false)
+
+    fun setTime() {
+        ConnectionService.card10Service?.setTime() ?: Log.e(TAG, "card10 service not initialized")
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/main_fragment.xml b/app/src/main/res/layout/main_fragment.xml
index 5151484721f2e56c89a3d5f19b0d16ba693e7d76..dee6ca249f34c9c171d09669097a0973708e9439 100644
--- a/app/src/main/res/layout/main_fragment.xml
+++ b/app/src/main/res/layout/main_fragment.xml
@@ -85,6 +85,16 @@
                 app:layout_constraintLeft_toLeftOf="parent"
                 app:layout_constraintRight_toRightOf="parent"/>
 
+        <Button android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="@dimen/main_button_margin"
+                style="@style/MainButton"
+                android:id="@+id/button_set_time"
+                android:text="@string/main_button_set_time"
+                app:layout_constraintTop_toBottomOf="@+id/button_beautiful"
+                app:layout_constraintLeft_toLeftOf="parent"
+                app:layout_constraintRight_toRightOf="parent"/>
+
     </androidx.constraintlayout.widget.ConstraintLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/time_update_dialog.xml b/app/src/main/res/layout/time_update_dialog.xml
new file mode 100644
index 0000000000000000000000000000000000000000..89eb70800280766fbee27ebaefe60234cee11b2e
--- /dev/null
+++ b/app/src/main/res/layout/time_update_dialog.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:padding="@dimen/dialog_padding">
+
+    <ProgressBar android:layout_width="@dimen/progress_dialog_progress_size"
+                 android:layout_height="@dimen/progress_dialog_progress_size"
+                 android:layout_gravity="center"
+                 android:indeterminate="true"/>
+
+    <TextView android:layout_width="wrap_content"
+              android:layout_height="wrap_content"
+              android:layout_gravity="center"
+              android:layout_marginTop="@dimen/progress_dialog_text_margin"
+              android:text="@string/time_update_dialog_setting"/>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 87c8728edfd0dd8b7127fa71b36a8599ea4b04e8..c9daf48715003a0614387fd8aee07324c0fc3c58 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -10,6 +10,7 @@
     <string name="main_button_send_file">Send File</string>
     <string name="main_button_mood">Change Mood</string>
     <string name="main_button_beautiful">Beautiful</string>
+    <string name="main_button_set_time">Set Time</string>
 
     <string name="file_transfer_button_pick_file">Select file</string>
     <string name="file_transfer_button_start_transfer">Start</string>
@@ -32,6 +33,8 @@
     <string name="dialog_action_ok">OK</string>
     <string name="dialog_action_cancel">Cancel</string>
 
+    <string name="time_update_dialog_setting">Setting time</string>
+
     <string name="hatchery_error_generic">Something went wrong</string>
 
     <string name="app_detail_downloads">Downloads: %1$d</string>