Issue #26709: Fixed Y2038 problem in loading binary PLists.

2 files changed, 10 insertions, 1 deletions

diff --git a/Lib/plistlib.py b/Lib/plistlib.py
index b9946fd..a39151f 100644
--- a/Lib/plistlib.py
+++ b/Lib/plistlib.py
@@ -685,7 +685,7 @@ class _BinaryPlistParser:
             f = struct.unpack('>d', self._fp.read(8))[0]
             # timestamp 0 of binary plists corresponds to 1/1/2001
             # (year of Mac OS X 10.0), instead of 1/1/1970.
-            return datetime.datetime.utcfromtimestamp(f + (31 * 365 + 8) * 86400)
+            return datetime.datetime(2001, 1, 1) + datetime.timedelta(seconds=f)
 
         elif tokenH == 0x40:  # data
             s = self._get_size(tokenL)
diff --git a/Lib/test/test_plistlib.py b/Lib/test/test_plistlib.py
index fef9f39..f0e9e5a 100644
--- a/Lib/test/test_plistlib.py
+++ b/Lib/test/test_plistlib.py
@@ -428,6 +428,15 @@ class TestPlistlib(unittest.TestCase):
                 b'\x00\x00\x00\x00\x00\x00\x00\x13')
         self.assertEqual(plistlib.loads(data), {'a': 'b'})
 
+    def test_large_timestamp(self):
+        # Issue #26709: 32-bit timestamp out of range
+        for ts in -2**31-1, 2**31:
+            with self.subTest(ts=ts):
+                d = (datetime.datetime.utcfromtimestamp(0) +
+                     datetime.timedelta(seconds=ts))
+                data = plistlib.dumps(d, fmt=plistlib.FMT_BINARY)
+                self.assertEqual(plistlib.loads(data), d)
+
 
 class TestPlistlibDeprecated(unittest.TestCase):
     def test_io_deprecated(self):