From: Carsten Schoenert <c.schoenert@t-online.de>
Date: Sun, 6 Oct 2019 10:03:15 +0200
Subject: Make Thunderbird build reproducible

Cherry picked from OpenSuse
https://build.opensuse.org/request/show/732106
---
 python/mozbuild/mozbuild/action/langpack_manifest.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/mozbuild/mozbuild/action/langpack_manifest.py b/python/mozbuild/mozbuild/action/langpack_manifest.py
index fd1e9cc..b55a52d 100644
--- a/python/mozbuild/mozbuild/action/langpack_manifest.py
+++ b/python/mozbuild/mozbuild/action/langpack_manifest.py
@@ -16,6 +16,7 @@ import os
 import json
 import io
 import datetime
+import time
 import requests
 import mozversioncontrol
 import mozpack.path as mozpath
@@ -105,7 +106,7 @@ def get_timestamp_for_locale(path):
         dt = get_dt_from_hg(path)
 
     if dt is None:
-        dt = datetime.datetime.utcnow()
+        dt = datetime.datetime.utcfromtimestamp(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
 
     dt = dt.replace(microsecond=0)
     return dt.strftime("%Y%m%d%H%M%S")