old_contents: from django.contrib import admin
  from django.contrib.auth.models import User
  from django.contrib.auth.admin import UserAdmin
  from models import CustomUser, Announcement
  from django.contrib.auth.forms import UserCreationForm
  from django import forms
  from django.utils.translation import ugettext_lazy as _
  from django.db import models
  from django.contrib.admin import widgets
  
  class CustomUserCreationForm(UserCreationForm):
      username = forms.RegexField(label=_("Username"), max_length=30, regex=r'^\w+$',
          help_text = _("Required. 30 characters or fewer. Alphanumeric characters only (letters, digits and underscores)."),
          error_message = _("This value must contain only letters, numbers and underscores."))
      password1 = forms.CharField(label=_("Password"), widget=forms.PasswordInput)
      password2 = forms.CharField(label=_("Password confirmation"), widget=forms.PasswordInput)
      email = forms.EmailField(label=_('Email'))
      
      class Meta:
          model = CustomUser
          fields = ("username", "email")
  
  class CustomUserAdmin(UserAdmin):
      add_form = CustomUserCreationForm
      list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff', 'is_superuser', 'last_ip')
      search_fields = ('username', 'first_name', 'last_name', 'email', 'id')
      add_fieldsets = (
          (None, {
              'classes': ('wide',),
              'fields': ('username', 'email', 'password1', 'password2')}
          ),
      )
  
  class AnnouncementAdmin(admin.ModelAdmin):
      formfield_overrides = {
          models.CharField: {'widget': widgets.AdminTextareaWidget}
      }
      list_display = ('content', 'created', 'visible')
      actions = ['make_hidden']
      
      def visible(self, obj):
          return not obj.hidden
      visible.boolean = True
  
      def make_hidden(self, request, queryset):
          Announcement.clear_cache()
          queryset.update(hidden=True)
      make_hidden.short_description = _(u'Hide')
      
  admin.site.register(Announcement, AnnouncementAdmin)
  admin.site.unregister(User)    
  admin.site.register(CustomUser, CustomUserAdmin)
new_contents: from django.contrib import admin
  from django.contrib.auth.models import User
  from django.contrib.auth.admin import UserAdmin
  from models import CustomUser, Announcement
  from django.contrib.auth.forms import UserCreationForm
  from django import forms
  from django.utils.translation import ugettext_lazy as _
  from django.db import models
  from django.contrib.admin import widgets
  from datetime import datetime
  
  class CustomUserCreationForm(UserCreationForm):
      username = forms.RegexField(label=_("Username"), max_length=30, regex=r'^\w+$',
          help_text = _("Required. 30 characters or fewer. Alphanumeric characters only (letters, digits and underscores)."),
          error_message = _("This value must contain only letters, numbers and underscores."))
      password1 = forms.CharField(label=_("Password"), widget=forms.PasswordInput)
      password2 = forms.CharField(label=_("Password confirmation"), widget=forms.PasswordInput)
      email = forms.EmailField(label=_('Email'))
      
      class Meta:
          model = CustomUser
          fields = ("username", "email")
  
  class CustomUserAdmin(UserAdmin):
      add_form = CustomUserCreationForm
      list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff', 'is_superuser', 'last_ip')
      search_fields = ('username', 'first_name', 'last_name', 'email', 'id')
      add_fieldsets = (
          (None, {
              'classes': ('wide',),
              'fields': ('username', 'email', 'password1', 'password2')}
          ),
      )
  
  class AnnouncementAdmin(admin.ModelAdmin):
      formfield_overrides = {
          models.CharField: {'widget': widgets.AdminTextareaWidget}
      }
      list_display = ('content', 'created', 'visible')
      actions = ['make_hidden']
      
      def get_form(self, request, obj=None, **kwargs):
          form = super(AnnouncementAdmin, self).get_form(request, obj=None, **kwargs)
          
          default_help_text = form.base_fields['created'].help_text
          now = datetime.now()
          form.base_fields['created'].help_text = default_help_text+\
              u'</br>Current server time is %s. Value is saved without timezone converting.' % now.strftime('%m/%d/%Y %H:%M:%S')
          return form
      
      def visible(self, obj):
          return not obj.hidden
      visible.boolean = True
  
      def make_hidden(self, request, queryset):
          Announcement.clear_cache()
          queryset.update(hidden=True)
      make_hidden.short_description = _(u'Hide')
      
  admin.site.register(Announcement, AnnouncementAdmin)
  admin.site.unregister(User)    
  admin.site.register(CustomUser, CustomUserAdmin)
subject: fix Announcement.created filed help_text