python 减去两个日期得到一个时间增量
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Subtract two dates to give a timedelta
提问by Stephen
I'm trying to get a value from one of my database values, which will be given by subtracting the purchase date from today's date. I've written my code this way:
我正在尝试从我的数据库值之一中获取一个值，该值将通过从今天的日期中减去购买日期来给出。我是这样写我的代码的：
delta = datetime.now() - item.purchase_date
But this gives me this error:
但这给了我这个错误：
unsupported operand type(s) for -: 'datetime.datetime' and 'datetime.date'
If I use datetime.datetime.now()this doesn't work. What am I missing. Thanks.
如果我使用datetime.datetime.now()它不起作用。我错过了什么。谢谢。
回答by SilentGhost
you need to use date.todayor datetime.now().date()instead of datetime.now:
您需要使用date.today或datetime.now().date()代替datetime.now：
>>> import datetime
>>> datetime.date.today()
datetime.date(2010, 2, 10)
>>> datetime.datetime.now().date()
datetime.date(2010, 2, 10)
