--- /usr/lib/python3.7/zipapp.py	2021-09-27 23:06:43.602658316 -0500
+++ zipapp.py	2021-09-30 18:57:11.727986187 -0500
@@ -1,4 +1,5 @@
 import contextlib
+import datetime
 import os
 import pathlib
 import shutil
@@ -131,6 +132,14 @@
     elif not hasattr(target, 'write'):
         target = pathlib.Path(target)
 
+    # Use a fixed file creation epoch if configured
+    try:
+        epoch = int(os.getenv('SOURCE_DATE_EPOCH'))  # throws TypeError on None
+        dt = datetime.datetime.fromtimestamp(epoch)
+        epoch = (dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second)
+    except TypeError:
+        epoch = None
+
     with _maybe_open(target, 'wb') as fd:
         _write_file_prefix(fd, interpreter)
         compression = (zipfile.ZIP_DEFLATED if compressed else
@@ -139,9 +148,17 @@
             for child in source.rglob('*'):
                 arcname = child.relative_to(source)
                 if filter is None or filter(arcname):
-                    z.write(child, arcname.as_posix())
+                    if not epoch:
+                        z.write(child, arcname.as_posix())
+                        continue
+                    with open(child, 'rb') as fp:
+                        zinfo = zipfile.ZipInfo(arcname.as_posix(), epoch)
+                        z.writestr(zinfo, fp.read())
             if main_py:
-                z.writestr('__main__.py', main_py.encode('utf-8'))
+                zinfo = '__main__.py'
+                if epoch:
+                    zinfo = zipinfo.ZipInfo('__main__.py', epoch)
+                z.writestr(zinfo, main_py.encode('utf-8'))
 
     if interpreter and not hasattr(target, 'write'):
         target.chmod(target.stat().st_mode | stat.S_IEXEC)