From b3bfec91196b2cb51abb8ec20534979976a53daf Mon Sep 17 00:00:00 2001
From: Bryan Forbes <bryan@reigndropsfall.net>
Date: Sat, 25 Aug 2018 14:44:10 -0500
Subject: [PATCH] Fix CallMessage.duration calculation

---
 discord/calls.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/discord/calls.py b/discord/calls.py
index 44b8f4db5..1c35d5ef6 100644
--- a/discord/calls.py
+++ b/discord/calls.py
@@ -74,9 +74,9 @@ class CallMessage:
             The timedelta object representing the duration.
         """
         if self.ended_timestamp is None:
-            return datetime.datetime.utcnow() - self.message.timestamp
+            return datetime.datetime.utcnow() - self.message.created_at
         else:
-            return self.ended_timestamp - self.message.timestamp
+            return self.ended_timestamp - self.message.created_at
 
 class GroupCall:
     """Represents the actual group call from Discord.