RTC does not track tm_isdst

[ilikecake]

CircuitPython version

Adafruit CircuitPython 8.0.3 on 2023-02-23; Adafruit Feather ESP32S3 4MB Flash 2MB PSRAM with ESP32S3

Code/REPL

import time
import rtc

nowtime = time.struct_time((2023, 3, 18, 13, 47, 28, 5, 77, 1))
rtc.RTC().datetime = nowtime
now = time.localtime()
print("Time sent to RTC:", nowtime)
print("Time from RTC:", now)

nowtime = time.struct_time((2023, 3, 18, 13, 47, 28, 5, 77, 0))
rtc.RTC().datetime = nowtime
now = time.localtime()
print("Time sent to RTC:", nowtime)
print("Time from RTC:", now)

Behavior

Time sent to RTC: struct_time(tm_year=2023, tm_mon=3, tm_mday=18, tm_hour=13, tm_min=47, tm_sec=28, tm_wday=5, tm_yday=77, tm_isdst=1)
Time from RTC: struct_time(tm_year=2023, tm_mon=3, tm_mday=18, tm_hour=13, tm_min=47, tm_sec=28, tm_wday=5, tm_yday=77, tm_isdst=-1)
Time sent to RTC: struct_time(tm_year=2023, tm_mon=3, tm_mday=18, tm_hour=13, tm_min=47, tm_sec=28, tm_wday=5, tm_yday=77, tm_isdst=0)
Time from RTC: struct_time(tm_year=2023, tm_mon=3, tm_mday=18, tm_hour=13, tm_min=47, tm_sec=28, tm_wday=5, tm_yday=77, tm_isdst=-1)

Description

When setting the time in the RTC, the tm_isdst member of the struct is not set. In the above example, I set it to 1 (DST applied) or 0 (DST not applied), but the RTC always returns -1.

I am not expecting the RTC to handle the time change from DST, but I was expecting it to store that variable so that my code can use it to check if DST has been implemented.

Alternatively, if tm_isdst cannot be saved for some reason, please update the documentation here so that we know what to expect.

Additional information

No response