Bug in time.localtime(t) CircuitPython?

[powersoft]

I wont to convert a unixtimestamp to localtime in circuit python.
This is the simple code:

unix_correction = 946684800 # correct to 01-01-2000
timezone = 7200
t=1598887049

def convertUnixTime(t,timezone):
dummy=time.localtime(t-unix_correction+timezone)
return "%4d-%02d-%02d %02d:%02d" % (dummy[0],dummy[1],dummy[2],dummy[3],dummy[4])

Running it I get the error message:

"timestamp out of range for platform time_t"

could not found a solution for this problem (it is working well in micropython!)

thank for any help.
cheers,
Jan

[nk521]

This code works in micropython because there is no inbuilt "unix epoch correction" there.
time_localtime calls timeutils_seconds_since_2000_to_struct_time compare this with circuitpython's timeutils timeutils_seconds_since_epoch_to_struct_time function which gets called during localtime

void timeutils_seconds_since_epoch_to_struct_time(mp_uint_t t, timeutils_struct_time_t *tm) {
    t -= EPOCH1970_EPOCH2000_DIFF_SECS;
    timeutils_seconds_since_2000_to_struct_time(t, tm);
}

second line does what you're trying to do. So you can remove unix_correction from your code and it will work fine.

[garethhcoleman]

@powersoft are you happy that the explanation / solution given closes this issue?

[nk521]

I just noticed that this issue is still open. Can we close this issue as there's no activity going on here.

[DJDevon3]

This is no longer an issue. You can easily convert Unix epoch timestamps and timezone offset manually with something like this:

import time
def _format_datetime(datetime):
    return "{:02}/{:02}/{} {:02}:{:02}:{:02}".format(
        datetime.tm_mon,
        datetime.tm_mday,
        datetime.tm_year,
        datetime.tm_hour,
        datetime.tm_min,
        datetime.tm_sec,
    )

unix_time = 1660764970 # Wed Aug 17 2022 19:36:10 GMT+0000
tz_offset_seconds = -14400  # NY Timezone

get_timestamp = int(unix_time + tz_offset_seconds)
current_unix_time = time.localtime(get_timestamp)
current_struct_time = time.struct_time(current_unix_time)
current_date = "{}".format(_format_datetime(current_struct_time))

print("Timestamp:", current_date)

code.py output:
Timestamp: 08/17/2022 15:36:10

Just because the syntax doesn’t work as it does in micropython doesn’t necessarily mean it’s a bug. Trying to help plug holes with stuff tagged as good first issue.