diff --git a/occtax/build.gradle b/occtax/build.gradle
index 402d657..eab6428 100644
--- a/occtax/build.gradle
+++ b/occtax/build.gradle
@@ -33,7 +33,6 @@ android {
         targetSdkVersion 34
         versionCode 3320
         versionName "2.7.1"
-        buildConfigField "String", "BUILD_DATE", "\"" + new Date().getTime() + "\""
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         archivesBaseName = project.name + "-" + versionName
     }
diff --git a/occtax/src/main/java/fr/geonature/occtax/ui/home/HomeActivity.kt b/occtax/src/main/java/fr/geonature/occtax/ui/home/HomeActivity.kt
index 7f9019d..b4bd8ef 100644
--- a/occtax/src/main/java/fr/geonature/occtax/ui/home/HomeActivity.kt
+++ b/occtax/src/main/java/fr/geonature/occtax/ui/home/HomeActivity.kt
@@ -224,7 +224,16 @@ class HomeActivity : AppCompatActivity(),
                     BuildConfig.VERSION_NAME,
                     BuildConfig.VERSION_CODE,
                     DateFormat.getDateTimeInstance()
-                        .format(Date(BuildConfig.BUILD_DATE.toLong()))
+                        .format(
+                            Date(
+                                File(
+                                    packageManager.getApplicationInfo(
+                                        packageName,
+                                        0
+                                    ).sourceDir
+                                ).lastModified()
+                            )
+                        )
                 )
             )
         }