From 81adcaddbe0c5c63d36734e4142fa2d37e6e3374 Mon Sep 17 00:00:00 2001
From: Salakar <mike.diarmid@gmail.com>
Date: Tue, 25 Sep 2018 18:58:30 +0100
Subject: [PATCH] [android][utils] timestampToUTC method

---
 .../main/java/io/invertase/firebase/Utils.java    | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/android/src/main/java/io/invertase/firebase/Utils.java b/android/src/main/java/io/invertase/firebase/Utils.java
index f71eebcc..03eb1b0c 100644
--- a/android/src/main/java/io/invertase/firebase/Utils.java
+++ b/android/src/main/java/io/invertase/firebase/Utils.java
@@ -12,8 +12,13 @@ import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.common.LifecycleState;
 import com.facebook.react.modules.core.DeviceEventManagerModule;
 
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
+import java.util.TimeZone;
 
 import javax.annotation.Nullable;
 
@@ -22,6 +27,14 @@ import javax.annotation.Nullable;
 public class Utils {
   private static final String TAG = "Utils";
 
+  public static String timestampToUTC(long timestamp) {
+    Calendar calendar = Calendar.getInstance();
+    Date date = new Date((timestamp + calendar.getTimeZone().getOffset(timestamp)) * 1000);
+    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
+    format.setTimeZone(TimeZone.getTimeZone("UTC"));
+    return format.format(date);
+  }
+
   /**
    * send a JS event
    **/
@@ -156,7 +169,7 @@ public class Utils {
 
         try {
           reactContext = (ReactContext) context;
-        } catch(ClassCastException exception) {
+        } catch (ClassCastException exception) {
           // Not react context so default to true
           return true;
         }