I get
Starting datetime is 2020-03-08 01:00:00
Represented as a time tuple, this is time.struct_time(tm_year=2020, tm_mon=3,
tm_mday=8, tm_hour=1, tm_min=0, tm_sec=0, tm_wday=6, tm_yday=68, tm_isdst=-1)
After adding an hour, the resultant datetime is 2020-03-08 02:00:00
Represented as a timetuple this is time.struct_time(tm_year=2020, tm_mon=3,
tm_mday=8, tm_hour=2, tm_min=0, tm_sec=0, tm_wday=6, tm_yday=68, tm_isdst=-1)
Traceback (most recent call last):
File "./test.py", line 22, in <module>
ts = time.mktime(tt1)
OverflowError: mktime argument out of range
I wrote a test program for mktime. With the isdst/gmtoff values from
localtime, it works. With this, I can provoke EINVAL, which I think is
per the spec.
----------------------------------------
#include <errno.h>
#include <stdio.h>
#include <time.h>
int
main()
{
struct tm *t;
time_t start = 1583647200; /* 20200308T0100 EST */
time_t plus1;
t = localtime(&start);
printf("isdst %d tm_gmtoff %ld\n", t->tm_isdst, t->tm_gmtoff);
t->tm_isdst = -1;
t->tm_gmtoff = 0;
printf("isdst %d tm_gmtoff %ld\n", t->tm_isdst, t->tm_gmtoff);
t->tm_hour += 1;
printf("tm_hour %d\n", t->tm_hour);
plus1 = mktime(t);
printf("plus1 %jd errno %d\n", (intmax_t) plus1, errno);
printf("result: %s\n", plus1 == 1583650800 ? "ok" : "bad");
return 0;
}
----------------------------------------
isdst 0 tm_gmtoff -18000
isdst -1 tm_gmtoff 0
tm_hour 2
plus1 -1 errno 22
result: bad
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