id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
17836	Can't assign values for models.DateTimeField(blank=True, null=True)	cmsimike@…	nobody	"Using Django 1.4b1 with timezone aware datetime objects

It seems to be the case that I cannot assign a value to a model's field and persist it to the database. The field is defined as 
asked_on = models.DateTimeField(blank=True, null=True)
and I've tried datetime.now and timezone.now()

What happens is this:
model.asked_on = datetime.now() (or timezone.now())
print model.asked_on  # None is printed to the console
model.save()  #sql logs show a null value being put into the update query."	Bug	closed	Database layer (models, ORM)	1.4-beta-1	Release blocker	needsinfo			Unreviewed	0	0	0	0	0	0