In the thread "datetime module enhancements" Guido and others said that it is unpythonic to limit timestamp (seconds since Epoch) to an signed int with 32bit.
I've made a patch that introduces a new type Py_time_t as a first step to increase the size of time stamps. For now it's just an alias for time_t.
typedef time_t Py_time_t;
I'm proposing to change time_t in two steps:
Python 2.6: Replace every occurrence of time_t by Py_time_t and give third party authors time to change their software
Python 2.7 / 3000: Change Py_time_t to a signed 64bit int on all platforms and provide the necessary workaround for platforms with a 32bit time_t.