Eryk Sun added the comment:
This is due to computing the PEP 495 fold in the function
datetime_from_timet_and_us in Modules/_datetimemodule.c. It computes the local
time for (timet - max_fold_seconds), which is negative for timestamps less than
max_fold_seconds (86400). It's documented that localtime_s [1] fails for
negative time values. For example:
0:000> kc 6
Call Site
python36_d!localtime_s
python36_d!_PyTime_localtime
python36_d!local
python36_d!datetime_from_timet_and_us
python36_d!datetime_from_timestamp
python36_d!datetime_fromtimestamp
Dereference the time_t* arg (-86400):
0:000> ?? *(int64_t *)@rdx
int64 0n-86400
Print the errno_t return value (0x16 is EINVAL):
0:000> pt; r rax
rax=0000000000000016
[1]: https://msdn.microsoft.com/en-us/library/a442x3ye.aspx
----------
components: +Library (Lib), Windows
nosy: +belopolsky, eryksun, paul.moore, steve.dower, tim.golden, tim.peters,
zach.ware
type: -> behavior
versions: +Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30684>
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