diff --git a/app/chewy/accounts_index.rb b/app/chewy/accounts_index.rb
index e38e14a10..9b78af85d 100644
--- a/app/chewy/accounts_index.rb
+++ b/app/chewy/accounts_index.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class AccountsIndex < Chewy::Index
+  include DatetimeClampingConcern
+
   settings index: { refresh_interval: '30s' }, analysis: {
     analyzer: {
       content: {
@@ -38,6 +40,6 @@ class AccountsIndex < Chewy::Index
 
     field :following_count, type: 'long', value: ->(account) { account.following_count }
     field :followers_count, type: 'long', value: ->(account) { account.followers_count }
-    field :last_status_at, type: 'date', value: ->(account) { account.last_status_at || account.created_at }
+    field :last_status_at, type: 'date', value: ->(account) { clamp_date(account.last_status_at || account.created_at) }
   end
 end
diff --git a/app/chewy/concerns/datetime_clamping_concern.rb b/app/chewy/concerns/datetime_clamping_concern.rb
new file mode 100644
index 000000000..7f176b6e5
--- /dev/null
+++ b/app/chewy/concerns/datetime_clamping_concern.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module DatetimeClampingConcern
+  extend ActiveSupport::Concern
+
+  MIN_ISO8601_DATETIME = '0000-01-01T00:00:00Z'.to_datetime.freeze
+  MAX_ISO8601_DATETIME = '9999-12-31T23:59:59Z'.to_datetime.freeze
+
+  class_methods do
+    def clamp_date(datetime)
+      datetime.clamp(MIN_ISO8601_DATETIME, MAX_ISO8601_DATETIME)
+    end
+  end
+end
diff --git a/app/chewy/tags_index.rb b/app/chewy/tags_index.rb
index df3d9e4cc..8c778dc65 100644
--- a/app/chewy/tags_index.rb
+++ b/app/chewy/tags_index.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class TagsIndex < Chewy::Index
+  include DatetimeClampingConcern
+
   settings index: { refresh_interval: '30s' }, analysis: {
     analyzer: {
       content: {
@@ -36,6 +38,6 @@ class TagsIndex < Chewy::Index
 
     field :reviewed, type: 'boolean', value: ->(tag) { tag.reviewed? }
     field :usage, type: 'long', value: ->(tag, crutches) { tag.history.aggregate(crutches.time_period).accounts }
-    field :last_status_at, type: 'date', value: ->(tag) { tag.last_status_at || tag.created_at }
+    field :last_status_at, type: 'date', value: ->(tag) { clamp_date(tag.last_status_at || tag.created_at) }
   end
 end