diff --git a/scipost/admin.py b/scipost/admin.py
index 32c2c40a9435158246668af90a39f4917232abe4..4fe9c27cd08971c8949375475d8e7bc850906f45 100644
--- a/scipost/admin.py
+++ b/scipost/admin.py
@@ -1,5 +1,3 @@
-import datetime
-
 from django.contrib import admin
 from django import forms
 
@@ -11,13 +9,16 @@ from scipost.models import Contributor, Remark,\
                            AffiliationObject,\
                            RegistrationInvitation,\
                            AuthorshipClaim, PrecookedEmail,\
-                           EditorialCollege, EditorialCollegeFellowship
+                           EditorialCollege, EditorialCollegeFellowship, UnavailabilityPeriod
 
 from journals.models import Publication
 from partners.admin import ContactToUserInline
 from submissions.models import Submission
 
 
+admin.site.register(UnavailabilityPeriod)
+
+
 class ContributorInline(admin.StackedInline):
     model = Contributor
     extra = 0
@@ -88,6 +89,7 @@ def get_remark_type(remark):
         return 'Recommendation'
     return ''
 
+
 class RemarkAdminForm(forms.ModelForm):
     submission = forms.ModelChoiceField(
         required=False,
@@ -97,6 +99,7 @@ class RemarkAdminForm(forms.ModelForm):
         model = Remark
         fields = '__all__'
 
+
 class RemarkAdmin(admin.ModelAdmin):
     search_fields = ['contributor', 'remark']
     list_display = [remark_text, 'contributor', 'date', get_remark_type]
@@ -104,6 +107,7 @@ class RemarkAdmin(admin.ModelAdmin):
     list_filter = [RemarkTypeListFilter]
     form = RemarkAdminForm
 
+
 admin.site.register(Remark, RemarkAdmin)
 
 
@@ -123,6 +127,7 @@ class DraftInvitationAdmin(admin.ModelAdmin):
     search_fields = ['first_name', 'last_name', 'email', 'processed']
     form = DraftInvitationAdminForm
 
+
 admin.site.register(DraftInvitation, DraftInvitationAdmin)
 
 
@@ -138,6 +143,7 @@ class RegistrationInvitationAdminForm(forms.ModelForm):
         model = RegistrationInvitation
         fields = '__all__'
 
+
 class RegistrationInvitationAdmin(admin.ModelAdmin):
     search_fields = ['first_name', 'last_name', 'email', 'invitation_key']
     list_display = ['__str__', 'invitation_type', 'invited_by', 'responded']
@@ -145,9 +151,8 @@ class RegistrationInvitationAdmin(admin.ModelAdmin):
     date_hierarchy = 'date_sent'
     form = RegistrationInvitationAdminForm
 
-admin.site.register(RegistrationInvitation, RegistrationInvitationAdmin)
-
 
+admin.site.register(RegistrationInvitation, RegistrationInvitationAdmin)
 admin.site.register(AuthorshipClaim)
 admin.site.register(Permission)
 
@@ -166,7 +171,6 @@ class AffiliationObjectAdmin(admin.ModelAdmin):
 admin.site.register(AffiliationObject, AffiliationObjectAdmin)
 
 
-
 class EditorialCollegeAdmin(admin.ModelAdmin):
     search_fields = ['discipline', 'member']
 
diff --git a/scipost/models.py b/scipost/models.py
index c8f96827a0aa1b6397076364705840e87ce51cde..a59ea8df52301965ee597ab3f795dff1048dfe02 100644
--- a/scipost/models.py
+++ b/scipost/models.py
@@ -164,6 +164,12 @@ class UnavailabilityPeriod(models.Model):
     start = models.DateField()
     end = models.DateField()
 
+    class Meta:
+        ordering = ['-start']
+
+    def __str__(self):
+        return '%s (%s to %s)' % (self.contributor, self.start, self.end)
+
 
 class Remark(models.Model):
     contributor = models.ForeignKey(Contributor, on_delete=models.CASCADE)