update build.gradle

build.gradle

@@ -1,8 +1,22 @@
+import java.text.SimpleDateFormat
 buildscript {
     ext.kotlin_version = '1.3.72'
     ext.version_plugin_kotlin = "1.3.31"
     ext.enable_plugin_kotlin = true
 
+    ext.getGitHash = { ->
+        try {
+            def stdout = new ByteArrayOutputStream()
+            exec {
+                commandLine 'git', 'rev-parse', 'HEAD'
+                standardOutput = stdout
+            }
+            return stdout.toString().trim()
+        } catch (Exception ignored) {
+            return 'unknown'
+        }
+    }
+
     repositories {
         google()
         jcenter()
@@ -39,6 +53,8 @@ android {
         versionCode code
 
         buildConfigField "boolean", "FEATURE_SETTINGS_SEARCH", "true"
+        buildConfigField "String", "BUILD_DATE", "\"${getBuildDate()}\""
+        buildConfigField "String", "GITHASH", "\"${getGitHash()}\""
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -256,4 +272,13 @@ task copyRepoFiles(type: Copy) {
     from rootProject.files(ROOT_TO_RAW_COPY_FILES)
     into "res/raw"
     rename { String fileName -> fileName.replace(fileName, fileName.toLowerCase()) }
-}
+}
+
+
+@SuppressWarnings(["UnnecessaryQualifiedReference", "SpellCheckingInspection", "GroovyUnusedDeclaration"])
+// Returns the build date in a RFC3339 compatible format. TZ is always converted to UTC
+static String getBuildDate() {
+    final SimpleDateFormat RFC3339_LIKE = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm'Z'")
+    RFC3339_LIKE.setTimeZone(TimeZone.getTimeZone("UTC"))
+    return RFC3339_LIKE.format(new Date())
+}