diff --git a/briar-android/build.gradle b/briar-android/build.gradle
index 43a500571..3f965100d 100644
--- a/briar-android/build.gradle
+++ b/briar-android/build.gradle
@@ -244,6 +244,7 @@ android {
 		resValue "string", "app_package", "org.briarproject.briar.android"
 		resValue "string", "app_name", "Briar"
 		buildConfigField "String", "GitHash", "\"${getGitHash()}\""
+		buildConfigField "Long", "BuildTimestamp", "${System.currentTimeMillis()}L"
 	}
 
 	buildTypes {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/BriarApplication.java b/briar-android/src/main/java/org/briarproject/briar/android/BriarApplication.java
index ff9c83982..bf78cecfa 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/BriarApplication.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/BriarApplication.java
@@ -6,9 +6,5 @@ package org.briarproject.briar.android;
  */
 public interface BriarApplication {
 
-	// This build expires on 31 December 2018
-	long EXPIRY_DATE = 1546214400 * 1000L;
-
 	AndroidComponent getApplicationComponent();
-
 }
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/TestingConstants.java b/briar-android/src/main/java/org/briarproject/briar/android/TestingConstants.java
index 748d7345c..96f1b5cf2 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/TestingConstants.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/TestingConstants.java
@@ -33,4 +33,12 @@ public interface TestingConstants {
 	 * intentionally.
 	 */
 	boolean PREVENT_SCREENSHOTS = !IS_DEBUG_BUILD;
+
+	/**
+	 * Debug and beta builds expire after 90 days. Final release builds expire
+	 * after 292 million years.
+	 */
+	long EXPIRY_DATE = IS_DEBUG_BUILD || IS_BETA_BUILD ?
+			BuildConfig.BuildTimestamp + 90 * 24 * 60 * 60 * 1000L :
+			Long.MAX_VALUE;
 }
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerControllerImpl.java
index a98b3a065..4a8e6d11e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerControllerImpl.java
@@ -28,7 +28,7 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
-import static org.briarproject.briar.android.BriarApplication.EXPIRY_DATE;
+import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 import static org.briarproject.briar.android.TestingConstants.IS_BETA_BUILD;
 import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 import static org.briarproject.briar.android.controller.BriarControllerImpl.DOZE_ASK_AGAIN;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java
index fecce6251..94429bc6b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java
@@ -20,7 +20,7 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static org.briarproject.briar.android.BriarApplication.EXPIRY_DATE;
+import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 
 public class SplashScreenActivity extends BaseActivity {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java b/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
index 757bb7159..884264a61 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
@@ -46,7 +46,7 @@ import static android.text.format.DateUtils.FORMAT_SHOW_DATE;
 import static android.text.format.DateUtils.MINUTE_IN_MILLIS;
 import static android.text.format.DateUtils.WEEK_IN_MILLIS;
 import static org.briarproject.briar.BuildConfig.APPLICATION_ID;
-import static org.briarproject.briar.android.BriarApplication.EXPIRY_DATE;
+import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault