From 8c4d5d562365fb6a896daeb8a82d3056934f170b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
Date: Mon, 24 Jan 2022 16:09:48 +0100
Subject: [PATCH] Use UTC datetime for reproducible builds

For reproducible builds, we use last modification time of the CHANGES
file.  This works pretty well, unless the builds are made in different
timezones.

Use UTC option to date command to make the builds reproducible.
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 48415e5638..334c54f0f0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1253,7 +1253,7 @@ AM_CONDITIONAL([HAVE_XELATEX], [test "$XELATEX" != ":" && test "$LATEXMK" != ":"
 # Pull release date from CHANGES file last modification date
 # for reproducible builds
 #
-release_date=`date -r CHANGES +%Y-%m-%d`
+release_date=`date -u -r CHANGES +%Y-%m-%d`
 AC_SUBST([RELEASE_DATE], $release_date)
 
 #