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Changes between Initial Version and Version 3 of Ticket #11672

-              initial
+              v3
 If you have a model like:
+{{{
 class Event(models.Model):
     ...
     end = models.DateTimeField(blank=True, null=True)
     ...
+}}}
 and a modelform like:
+{{{
 from django import forms
 from events.models import Event
 …
     class Meta:
         model = Event
+}}}
 submitting an empty field will cause a validation error.