#27304: Django 1.10 onwards broke previous behaviour for models.DateTimeField() 
in
Admin
-------------------------+-------------------------------------------------
     Reporter:  Kegan    |      Owner:  nobody
  Gan                    |
         Type:  Bug      |     Status:  new
    Component:           |    Version:  1.10
  contrib.admin          |   Keywords:  model admin datetime
     Severity:  Normal   |  formfield_overrides AdminDateWidget widget
 Triage Stage:           |  Has patch:  0
  Unreviewed             |
Easy pickings:  0        |      UI/UX:  0
-------------------------+-------------------------------------------------
 In Django 1.9 and prior, we can use a date widget in Admin for a
 `datetime` field. Specifically, we can override the default `datetime`
 widget in Admin using `AdminDateWidget`. In this way, user are only
 require to enter a ''date''. The ''time'' will be default 0h 0m 0s.

 From Django 1.10 onwards, this behaviour has break. Now, there is an error
 `Enter a list of values.` on save in Admin.

 Example code.

 Model:
 {{{
 class Highlight(models.Model):
     end_at = models.DateTimeField()

     def save(self, *args, **kwargs):
         # Add 23 hours, 59 minutes, 59 seconds to end_at so that it
 represent end of day.
         extratime = timedelta(hours=23, minutes=59, seconds=59)
         if self.end_at:
             self.end_at = self.end_at + extratime
         super(Highlight, self).save(*args, **kwargs)
 }}}

 Admin:
 {{{
 class HighlightAdmin(admin.ModelAdmin):
     formfield_overrides = {
         models.DateTimeField: {'widget': widgets.AdminDateWidget},
     }
 }}}

 Now there is no easy way to let user only input the ''date'' part of
 `datetime`field  in Admin.

--
Ticket URL: <https://code.djangoproject.com/ticket/27304>
Django <https://code.djangoproject.com/>
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