Fix #1509 (OSError thrown during sync on Windows if one of the timestamps is outside range 1970 to 2038)

cps/services/SyncToken.py

@@ -45,7 +45,8 @@ def to_epoch_timestamp(datetime_object):
 def get_datetime_from_json(json_object, field_name):
     try:
         return datetime.utcfromtimestamp(json_object[field_name])
-    except KeyError:
+    except (KeyError, OSError):
+        # OSError is thrown on Windows if timestamp is <1970 or >2038
         return datetime.min