From a11b1c104f96c803b62e9eca5cfc06fafaa9a422 Mon Sep 17 00:00:00 2001
From: Nikita Kniazev <nok.raven@gmail.com>
Date: Tue, 12 May 2020 15:31:33 +0300
Subject: [PATCH] Fix timestamp_delta_seconds (#603)

* The multiplier 1000000 is wrong
* Return seconds as function name and description says
* Use `difftime` instead of assuming `time_t` is in seconds
---
 src/engine/timestamp.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/engine/timestamp.cpp b/src/engine/timestamp.cpp
index 67090ca55..fe9947642 100644
--- a/src/engine/timestamp.cpp
+++ b/src/engine/timestamp.cpp
@@ -6,6 +6,7 @@
 
 /* This file is ALSO:
  * Copyright 2001-2004 David Abrahams.
+ * Copyright 2020 Nikita Kniazev.
  * Distributed under the Boost Software License, Version 1.0.
  * (See accompanying file LICENSE_1_0.txt or
  * http://www.boost.org/LICENSE_1_0.txt)
@@ -226,5 +227,5 @@ void timestamp_done()
  */
 double timestamp_delta_seconds( timestamp const * const a , timestamp const * const b )
 {
-	return ((b->secs*1000000.0+b->nsecs)-(a->secs*1000000.0+a->nsecs))/1000000.0;
+    return difftime(b->secs, a->secs) + (b->nsecs - a->nsecs) * 1.0E-9;
 }