catch OSError on Windows

Author: davidism

src/itsdangerous/timed.py

@@ -38,8 +38,7 @@ def get_timestamp(self) -> int:
 
     def timestamp_to_datetime(self, ts: int) -> datetime:
         """Convert the timestamp from :meth:`get_timestamp` into an
-        aware :class`datetime.datetime` in UTC. Raises :exc:`.ValueError`
-        if the timestamp is too far in the past or future for Python.
+        aware :class`datetime.datetime` in UTC.
 
         .. versionchanged:: 2.0
             The timestamp is returned as a timezone-aware ``datetime``
@@ -127,7 +126,8 @@ def unsign(
             if ts_int is not None:
                 try:
                     ts_dt = self.timestamp_to_datetime(ts_int)
-                except ValueError as exc:
+                except (ValueError, OSError) as exc:
+                    # Windows raises OSError
                     raise BadTimeSignature(
                         "Malformed timestamp", payload=value
                     ) from exc

tests/test_itsdangerous/test_timed.py

@@ -1,4 +1,3 @@
-import sys
 from datetime import datetime
 from datetime import timedelta
 from datetime import timezone
@@ -67,9 +66,6 @@ def test_malformed_timestamp(self, signer):
         assert "Malformed" in str(exc_info.value)
         assert exc_info.value.date_signed is None
 
-    @pytest.mark.skipif(
-        sys.platform == "win32", reason="Freezegun Invalid argument occurs on Windows"
-    )
     def test_malformed_future_timestamp(self, signer):
         signed = b"value.TgPVoaGhoQ.AGBfQ6G6cr07byTRt0zAdPljHOY"