Question

如何在python中检查过去一年中出现的日期。即从现在到（现在为1年）之间的日期

由于

Answer 1

In [10]: today=datetime.date.today()

In [11]: datetime.date(2010,5,5) < today
Out[11]: True

In [12]: today-datetime.timedelta(days=365) <= datetime.date(2010,5,5) < today
Out[12]: True

In [13]: today-datetime.timedelta(days=365) <= datetime.date(2009,5,5) < today
Out[13]: False

修改：如果today是闰年2000-2-29，则today-datetime.timedelta(days=365)为1999-3-1。如果你想在一年前成为1999-2-28，那么你可以使用

def add_years(date,num):
    try:
        result=datetime.date(date.year+num,date.month,date.day)
    except ValueError:
        result=datetime.date(date.year+num,date.month,date.day-1)
    return result

today=datetime.date(2000,2,29)
print(add_years(today,-1))
# 1999-02-28

Answer 2

这适用于闰年：

>>> from datetime import date
>>> today = date.today()
>>> date(today.year - 1, today.month, today.day) < date(2009, 06, 05) <= today
True
>>> date(today.year - 1, today.month, today.day) < date(2009, 06, 04) <= today
False
>>> date(today.year - 1, today.month, today.day) < date(2010, 07, 04) <= today
False

python日期出现在去年

2 个答案: