Datetime and suntime, TypeError: can't subtract offset-naive and offset-aware datetimes

Question

import datetime
from suntime import Sun, SunTimeException
from datetime import timedelta

def day_night_time(lat,long,TO_date,TO_time):
    sun = Sun(lat,long)
    date = datetime.date(int(TO_date[:4]), int(TO_date[5:7]), int(TO_date[8:10]))
    TO = datetime.datetime(int(TO_date[:4]), int(TO_date[5:7]), int(TO_date[8:10]),int(TO_time[:2]), int(TO_time[3:5]))

    day_sr = sun.get_local_sunrise_time(date)
    day_ss = sun.get_local_sunset_time(date)
    n_end = day_sr - timedelta(minutes=30)
    n_start = day_ss + timedelta(minutes=30)

    print(TO)
    print(n_end)
    # print(TO-n_end)


day_night_time(50,20,'2020-06-24','10:45:00.000000')

returns

2020-06-24 10:45:00                                                                                                                                                           
2020-06-24 02:02:00+00:00

我无法使用它，因为最后有 +00:00。删除 +00:00 或将其添加到其他日期的最佳方法是什么，以便可以使用它们。当前错误：TypeError: can't subtract offset-naive and offset-aware datetimes

非常感谢您的帮助

Answer 1

我建议您也本地化 TO，这样您就拥有所有可识别 tz 的日期时间对象。通过调用未指定时区的 astimezone() 方法，您可以轻松地将日期时间对象本地化为本地时区。我也自由地简化了代码：

from datetime import datetime, timedelta
from suntime import Sun

lat, long, TO_date, TO_time = 49.095, 8.437, '2020-06-24', '10:45:00.000000'

sun = Sun(lat, long)

# making use of input in ISO8601 compatible format,
# and localize to the local timezone:
TO = datetime.fromisoformat(TO_date + 'T' + TO_time).astimezone()

day_sr = sun.get_local_sunrise_time(TO) # 2020-06-24 05:23:00+02:00
day_ss = sun.get_local_sunset_time(TO) # 2020-06-24 21:35:00+02:00

n_end = day_sr - timedelta(minutes=30)
n_start = day_ss + timedelta(minutes=30)

print(TO)
print(n_end)
print(TO-n_end)

# 2020-06-24 10:45:00+02:00
# 2020-06-24 04:53:00+02:00
# 5:52:00

请注意，我还调整了 lat/lon，以便我可以验证 location/timezone 的结果。如 +02:00 所示，我使用的是 UTC+2 (CEST)。

另一个选项，如果你想使用所有天真的日期时间对象，是用 None 替换 tzinfo 属性。在上面的代码中，它看起来像

TO = datetime.fromisoformat(TO_date + 'T' + TO_time) # 2020-06-24 10:45:00
day_sr = sun.get_local_sunrise_time(TO).replace(tzinfo=None) # 2020-06-24 05:23:00
day_ss = sun.get_local_sunset_time(TO).replace(tzinfo=None) # 2020-06-24 21:35:00

这也很好，因为无论如何您只使用当地时间。

Datetime and suntime, TypeError: can't subtract offset-naive and offset-aware datetimes

Datetime and suntime, TypeError: can't subtract offset-naive and offset-aware datetimes

python

datetime

timedelta

python-datetime