--- Python-3.4.3/Lib/importlib/_bootstrap.py	2016-02-02 21:38:48.655809055 +0100
+++ Python-3.4.3/Lib/importlib/_bootstrap.py.new	2016-02-02 21:38:43.659769251 +0100
@@ -667,7 +667,10 @@ def _code_to_bytecode(code, mtime=0, sou
     """Compile a code object into bytecode for writing out to a byte-compiled
     file."""
     data = bytearray(MAGIC_NUMBER)
-    data.extend(_w_long(mtime))
+    if 'SOURCE_DATE_EPOCH' in _os.environ:
+        data.extend(_w_long(string.atoi(_os.environ['SOURCE_DATE_EPOCH'])))
+    else:
+        data.extend(_w_long(mtime))
     data.extend(_w_long(source_size))
     data.extend(marshal.dumps(code))
     return data