Django DateField default options

问题:

I have a model which has a date time field:

date = models.DateField(_("Date"), default=datetime.now())

When I check the app in the built in django admin, the DateField also has the time appended to it, so that if you try to save it it returns an error. How do I make the default just the date? (datetime.today() isn't working either)

回答1:

This is why you should always import the base datetime module: import datetime, rather than the datetime class within that module: from datetime import datetime.

The other mistake you have made is to actually call the function in the default, with the (). This means that all models will get the date at the time the class is first defined - so if your server stays up for days or weeks without restarting Apache, all elements will get same the initial date.

So the field should be:

import datetime
date = models.DateField(_("Date"), default=datetime.date.today)

回答2:

You mistake is using the datetime module instead of the date module. You meant to do this:

from datetime import date
date = models.DateField(_("Date"), default=date.today)

If you only want to capture the current date the proper way to handle this is to use the auto_now_add parameter:

date = models.DateField(_("Date"), auto_now_add=True)

However, the modelfield docs clearly state that auto_now_add and auto_now will always use the current date and are not a default value that you can override.

回答3:

date = models.DateTimeField(default=datetime.now, blank=True)

回答4:

This should do the trick:

models.DateTimeField(_("Date"), auto_now_add = True)

回答5:

You could also use lambda. Useful if you're using django.utils.timezone.now

date = models.DateField(_("Date"), default=lambda: now().date())