python日期出現在去年

Question

如何在Python中檢查日期是否出現在去年。即現在和（現在-1年）

由於

之間日期

Answer 1

這應該閏年工作：

>>> 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 

Answer 2

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 

編輯：如果today是閏年2000-2-29，然後today-datetime.timedelta(days=365)是1999-3-1。如果你想在一年前爲1999-2-28那麼你可以使用

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