--- a/debian/patches/reproducible_build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/reproducible_build.patch	2015-12-26 03:42:06.069491737 +0000
@@ -0,0 +1,20 @@
+--- hy-0.11.0.orig/docs/conf.py
++++ hy-0.11.0/docs/conf.py
+@@ -14,6 +14,7 @@
+ import os
+ import sys
+ import time
++import datetime
+ sys.path.append(os.path.abspath(".."))
+ 
+ import hy
+@@ -46,7 +47,8 @@ master_doc = 'index'
+ 
+ # General information about the project.
+ project = u'hy'
+-copyright = u'2013-%s, Paul Tagliamonte' % time.strftime('%Y')
++build_date = datetime.datetime.utcfromtimestamp(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
++copyright = u'2013-%s, Paul Tagliamonte' % build_date.year
+ 
+ # The version info for the project you're documenting, acts as replacement for
+ # |version| and |release|, also used in various other places throughout the
--- a/debian/patches/series	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/series	2015-12-26 03:42:03.185440315 +0000
@@ -0,0 +1 @@
+reproducible_build.patch