diff --git a/java/com/android/dialer/callrecord/impl/CallRecorderService.java b/java/com/android/dialer/callrecord/impl/CallRecorderService.java
index 298e8ad..9b710b5 100644
--- a/java/com/android/dialer/callrecord/impl/CallRecorderService.java
+++ b/java/com/android/dialer/callrecord/impl/CallRecorderService.java
@@ -49,7 +49,7 @@
   private MediaRecorder mMediaRecorder = null;
   private CallRecording mCurrentRecording = null;
 
-  private SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyMMdd_HHmmssSSS");
+  private SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyyMMdd-HHmmss");
 
   private final ICallRecorderService.Stub mBinder = new ICallRecorderService.Stub() {
     @Override
@@ -213,7 +213,7 @@
 
     int formatChoice = getAudioFormatChoice();
     String extension = formatChoice == 0 ? ".amr" : ".m4a";
-    return number + "_" + timestamp + extension;
+    return "CallRecord_" + timestamp + "_" + number + extension;
   }
 
   public static boolean isEnabled(Context context) {