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Oh, datetime.datetime.timestamp() also has a bug for values close to 0001年01月01日 (year 1), at least in my timezone (CET).
$ ./python -c 'import datetime; datetime.datetime.min.timestamp()'
python: /home/haypo/prog/python/default/Modules/_datetimemodule.c:251: days_before_year: Assertion `year >= 1' failed.
Aborted (core dumped)
datetime_check_args.patch doesn't fix this issue. A solution is to check that year>=1 in utc_to_seconds():
+ if (year < MINYEAR || year > MAXYEAR) {
+ PyErr_SetString(PyExc_ValueError,
+ "year is out of range");
+ return -1;
+ }
Maybe it would solve the following local() comment:
 /* XXX: add bounds checking */