我如何将<条码>日志>改为<条码>日值>。 反对:
Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to produce something like ...
我如何将<条码>日志>改为<条码>日值>。 反对:
文件:
返回日期同年、月和日。
您使用<代码>最新时间。
datetime.datetime.now().date()
很明显,上述表述可以(而且应当:)写成:
datetime.date.today()
2. 您可将某一日标改为日标的(日期)方法,具体如下:
<datetime_object>.date()
you could enter this code form for (today date & Names of the Day & hour) :
datetime.datetime.now().strftime( %y-%m-%d %a %H:%M:%S )
19-09-09 Mon 17:37.56
and enter this code for (today date simply):
datetime.date.today().strftime( %y-%m-%d )
19-09-10
for object :
datetime.datetime.now().date()
datetime.datetime.today().date()
datetime.datetime.utcnow().date()
datetime.datetime.today().time()
datetime.datetime.utcnow().date()
datetime.datetime.utcnow().time()
www.un.org/Depts/DGACM/index_spanish.htm 对3.7和的答复
这里,你可以提出日期和时间目标。
(aka <代码>datetime 物体,储存在models.Datetime
。 django模型领域
日标(aka datetime.date
Object):
from datetime import datetime
#your date-and-time object
# let s supposed it is defined as
datetime_element = datetime(2020, 7, 10, 12, 56, 54, 324893)
# where
# datetime_element = datetime(year, month, day, hour, minute, second, milliseconds)
# WHAT YOU WANT: your date-only object
date_element = datetime_element.date()
简言之,如果你印刷这些内容,这里的产出就是:
print(datetime_element)
207-10 12:56:54.324893
print(date_element)
2008年6月30日
import time
import datetime
# use mktime to step by one day
# end - the last day, numdays - count of days to step back
def gen_dates_list(end, numdays):
start = end - datetime.timedelta(days=numdays+1)
end = int(time.mktime(end.timetuple()))
start = int(time.mktime(start.timetuple()))
# 86400 s = 1 day
return xrange(start, end, 86400)
# if you need reverse the list of dates
for dt in reversed(gen_dates_list(datetime.datetime.today(), 100)):
print datetime.datetime.fromtimestamp(dt).date()
Solved: AttributeError: Series object has no attribute date
您可使用如下:
df["date"] = pd.to_datetime(df["date"]).dt.date
在以上编码日期既包括日期,又包括时间(2020-09-21 22:32:00)的地方,使用上述代码,我们只能获得日期(2020-09-21)。
I use data.strftime (%y-%m-%d )
with lambda to transfer一栏
如果你使用<pandas>,就可以解决这个问题:
请允许我说,你有了一个称为起步的变量——在你的数据框架内的类型时间64,这样你就可以获得这样的日期:
df.start_time.dt.date
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