gh-134261: Don't rely on local time for reproducible builds & tests

Author: ctrlaltf2

Lib/test/test_zipfile/test_core.py

@@ -1812,7 +1812,7 @@ def test_write_with_source_date_epoch(self):
 
             with zipfile.ZipFile(TESTFN, "r") as zf:
                 zip_info = zf.getinfo("test_source_date_epoch.txt")
-                get_time = time.localtime(int(os.environ['SOURCE_DATE_EPOCH']))[:6]
+                get_time = time.gmtime(int(os.environ['SOURCE_DATE_EPOCH']))[:6]
                 # Compare each element of the date_time tuple
                 # Allow for a 1-second difference
                 for z_time, g_time in zip(zip_info.date_time, get_time):

Lib/zipfile/__init__.py

@@ -623,9 +623,12 @@ def _for_archive(self, archive):
         Return self.
         """
         # gh-91279: Set the SOURCE_DATE_EPOCH to a specific timestamp
-        epoch = os.environ.get('SOURCE_DATE_EPOCH')
-        get_time = int(epoch) if epoch else time.time()
-        self.date_time = time.localtime(get_time)[:6]
+        source_date_epoch = os.environ.get('SOURCE_DATE_EPOCH')
+
+        if source_date_epoch:
+            self.date_time = time.gmtime(int(source_date_epoch))[:6]
+        else:
+            self.date_time = time.localtime(time.time())[:6]
 
         self.compress_type = archive.compression
         self.compress_level = archive.compresslevel