diff --git a/0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch b/0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch
new file mode 100644
index 0000000..a4be429
--- /dev/null
+++ b/0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch
@@ -0,0 +1,53 @@
+From 2098a5128565a72fc1886e996a444cc111e43c36 Mon Sep 17 00:00:00 2001
+From: Witek Bedyk <witold.bedyk@suse.com>
+Date: Tue, 26 Apr 2022 17:21:46 +0200
+Subject: [PATCH] Set build date from SOURCE_DATE_EPOCH
+
+Allow to override build date with SOURCE_DATE_EPOCH
+in order to make builds reproducible.
+See https://reproducible-builds.org/ for why this is good
+and https://reproducible-builds.org/specs/source-date-epoch/
+for the definition of this variable.
+
+This PR was done while working on [reproducible builds for
+openSUSE](https://en.opensuse.org/openSUSE:Reproducible_Builds).
+
+Signed-off-by: Witek Bedyk <witold.bedyk@suse.com>
+---
+ cmd/build.go | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/cmd/build.go b/cmd/build.go
+index 18f1c5e..694b964 100644
+--- a/cmd/build.go
++++ b/cmd/build.go
+@@ -20,6 +20,7 @@ import (
+ 	"log"
+ 	"os"
+ 	"path"
++	"strconv"
+ 	"strings"
+ 	"text/template"
+ 	"time"
+@@ -146,10 +147,17 @@ func getLdflags(info repository.Info) string {
+ 	var ldflags []string
+ 
+ 	if len(strings.TrimSpace(config.Build.LDFlags)) > 0 {
++		var buildDate time.Time
++		unixBuildDate, err := strconv.ParseInt(os.Getenv("SOURCE_DATE_EPOCH"), 10, 64)
++		if err == nil {
++			buildDate = time.Unix(unixBuildDate, 0)
++		} else {
++			buildDate = time.Now()
++		}
+ 		var (
+ 			tmplOutput = new(bytes.Buffer)
+ 			fnMap      = template.FuncMap{
+-				"date":     time.Now().UTC().Format,
++				"date":     buildDate.UTC().Format,
+ 				"host":     os.Hostname,
+ 				"repoPath": RepoPathFunc,
+ 				"user":     UserFunc,
+-- 
+2.34.1
+
diff --git a/golang-github-prometheus-promu.changes b/golang-github-prometheus-promu.changes
index 80f26f3..b7f65b6 100644
--- a/golang-github-prometheus-promu.changes
+++ b/golang-github-prometheus-promu.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Tue Apr 26 17:13:58 UTC 2022 - Witek Bedyk <witold.bedyk@suse.com>
+
+- Set build date from last changelog modification (boo#1047218)
+
 -------------------------------------------------------------------
 Fri Apr  1 13:56:36 UTC 2022 - Stefan Bluhm <stefan.bluhm@clacee.eu>
 
diff --git a/golang-github-prometheus-promu.spec b/golang-github-prometheus-promu.spec
index bf0a472..71154ea 100644
--- a/golang-github-prometheus-promu.spec
+++ b/golang-github-prometheus-promu.spec
@@ -15,6 +15,7 @@
 # Please submit bugfixes or comments via https://bugs.opensuse.org/
 #
 
+
 %if 0%{?rhel}
 # Fix ERROR: No build ID note found in
 %undefine _missing_build_ids_terminate_build
@@ -31,6 +32,7 @@ Group:          System/Management
 URL:            https://github.com/prometheus/promu
 Source:         promu-%{version}.tar.gz
 Source1:        vendor.tar.gz
+Patch1:         0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch
 BuildRequires:  golang-packaging
 %if 0%{?rhel}
 BuildRequires:  golang >= 1.15
@@ -44,8 +46,7 @@ BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 The Prometheus Utility Tool is used by the Prometheus project to build other components.
 
 %prep
-%setup -q -n promu-%{version}
-%setup -q -T -D -a 1 -n promu-%{version}
+%autosetup -a1 -p1 -n promu-%{version}
 
 %build
 %goprep github.com/prometheus/promu