[issue41321] Calculate timestamp is wrong in datetime.datetime

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

Serhiy, you are right. I wrote below script that could explain the difference.

# ../backups/bpo41321.py
import datetime
import zoneinfo

for tz in zoneinfo.available_timezones():
    diff = datetime.datetime(1986, 5, 4, 7, 13, 22, tzinfo=zoneinfo.ZoneInfo(tz)).timestamp() - datetime.datetime(1986, 5, 4, 0, 0, 0, tzinfo=zoneinfo.ZoneInfo(tz)).timestamp()
    if diff != 26002:
        print(diff, tz)

for tz in zoneinfo.available_timezones():
    diff = datetime.datetime(1986, 5, 2, 7, 13, 22, tzinfo=zoneinfo.ZoneInfo(tz)).timestamp() - datetime.datetime(1986, 5, 2, 0, 0, 0, tzinfo=zoneinfo.ZoneInfo(tz)).timestamp()
    if diff != 26002:
        print("Diff using second day", diff, tz)

$ ./python ../backups/bpo41321.py
22402.0 Asia/Harbin
22402.0 Asia/Shanghai
22402.0 PRC
22402.0 Asia/Chongqing
22402.0 Asia/Chungking

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41321>
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