Using version number that is more meaningful (year/month/day/buildNumber)

app/build.gradle

@@ -1,7 +1,9 @@
 apply plugin: 'com.android.application'
 
-def offset = 1609201649;
-def code = System.getenv("BITRISE_BUILD_NUMBER") as Integer ?: 0
+def date = new Date()
+def formattedDate = date.format('yyyyMMdd')
+def code = formattedDate.toInteger() * 100
+def buildNumber = System.getenv("BITRISE_BUILD_NUMBER") as Integer ?: 0
 
 android {
     compileSdkVersion 24
@@ -11,8 +13,8 @@ android {
         applicationId "org.hitlabnz.sensor_fusion_demo"
         minSdkVersion 18
         targetSdkVersion 24
-        versionCode code + offset
-        versionName "1.4." + code
+        versionCode code + buildNumber
+        versionName "1.4." + buildNumber
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }