我可以为Django日期时间字段设置特定的默认时间吗？ [英] Can I set a specific default time for a Django datetime field?

问题描述

我有一个事件模型，该事件几乎总是在晚上10:00开始，但有时可能更早/以后开始。为了方便管理员，我希望将时间默认为晚上10点，但可以根据需要进行更改；无论如何，都需要设置日期，因此它不需要默认值，但理想情况下，它将默认为当前日期。

I have a model for events which almost always start at 10:00pm, but may on occasion start earlier/later. To make things easy in the admin, I'd like for the time to default to 10pm, but be changeable if needed; the date will need to be set regardless, so it doesn't need a default, but ideally it would default to the current date.

我意识到我可以使用datetime.now完成后者，但是是否可以（以及如何）将时间设置为特定的默认值？

I realize that I can use datetime.now to accomplish the latter, but is it possible (and how) to I set the time to a specific default value?

更新：我得到的答案快于我能弄清哪个人完成了我要完成的工作...我可能应该更进一步我问之前的应用程序。

Update: I'm getting answers faster than I can figure out which one(s) does what I'm trying to accomplish...I probably should have been further along with the app before I asked. Thanks for the help in the meantime!

推荐答案

从Django文档中获取 Field.default ：

From the Django documents for Field.default:

该字段的默认值。这可以是一个值或一个可调用的
对象。如果可调用，则每次创建新对象
时都会调用它。

The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created.

因此，请执行以下操作：

So do this:

from datetime import datetime, timedelta

def default_start_time():
    now = datetime.now()
    start = now.replace(hour=22, minute=0, second=0, microsecond=0)
    return start if start > now else start + timedelta(days=1)  

class Something(models.Model):
    timestamp = models.DateTimeField(default=default_start_time)

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