--- a/debian/patches/reproducible-build.patch	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/reproducible-build.patch	2021-05-22 11:37:22.740539535 +0100
@@ -0,0 +1,30 @@
+Description: Make the build reproducible
+Author: Chris Lamb <lamby@debian.org>
+Last-Update: 2021-05-22
+
+--- apispec-3.3.1.orig/docs/conf.py
++++ apispec-3.3.1/docs/conf.py
+@@ -1,6 +1,7 @@
+ import datetime as dt
+ import os
+ import sys
++import time
+ 
+ sys.path.insert(0, os.path.abspath(os.path.join("..", "src")))
+ import apispec  # noqa: E402
+@@ -23,10 +24,14 @@ intersphinx_mapping = {
+ 
+ issues_github_path = "marshmallow-code/apispec"
+ 
++build_date = dt.datetime.utcfromtimestamp(
++    int(os.environ.get('SOURCE_DATE_EPOCH', time.time()))
++)
++
+ source_suffix = ".rst"
+ master_doc = "index"
+ project = "apispec"
+-copyright = "Steven Loria {:%Y}".format(dt.datetime.utcnow())
++copyright = "Steven Loria {:%Y}".format(build_date)
+ 
+ version = release = apispec.__version__
+ 
--- a/debian/patches/series	1970-01-01 01:00:00.000000000 +0100
--- b/debian/patches/series	2021-05-22 11:37:21.668527250 +0100
@@ -0,0 +1 @@
+reproducible-build.patch