diff --git a/src/openalpr/alpr_impl.cpp b/src/openalpr/alpr_impl.cpp
index fce858a..2eda4f8 100644
--- a/src/openalpr/alpr_impl.cpp
+++ b/src/openalpr/alpr_impl.cpp
@@ -281,12 +281,15 @@ std::vector<AlprResult> AlprImpl::recognize(cv::Mat img, std::vector<cv::Rect> r
    return rectRegions;
  }
 
-string AlprImpl::toJson(const vector< AlprResult > results, double processing_time_ms)
+string AlprImpl::toJson(const vector<AlprResult > results, double processing_time_ms, long epoch_time)
 {
   cJSON *root, *jsonResults;
   root = cJSON_CreateObject();
   
-  cJSON_AddNumberToObject(root,"epoch_time",		getEpochTime()  );
+  if (epoch_time <= 0)
+    epoch_time = getEpochTime();
+  
+  cJSON_AddNumberToObject(root,"epoch_time",	epoch_time	  );
   if (processing_time_ms >= 0)
   {
     cJSON_AddNumberToObject(root,"processing_time_ms",		processing_time_ms );
diff --git a/src/openalpr/alpr_impl.h b/src/openalpr/alpr_impl.h
index 2b518be..2c1d1f4 100644
--- a/src/openalpr/alpr_impl.h
+++ b/src/openalpr/alpr_impl.h
@@ -79,7 +79,7 @@ class AlprImpl
     void setTopN(int topn);
     void setDefaultRegion(std::string region);
     
-    std::string toJson(const std::vector<AlprResult> results, double processing_time_ms = -1);
+    std::string toJson(const std::vector<AlprResult> results, double processing_time_ms = -1, long epoch_time = -1);
     static std::string getVersion();
     
     Config* config;