diff --git a/fimfarchive/mappers.py b/fimfarchive/mappers.py
index 380286b..515d05a 100644
--- a/fimfarchive/mappers.py
+++ b/fimfarchive/mappers.py
@@ -24,6 +24,8 @@ Mappers for Fimfarchive.
 
 import os
 
+import arrow
+
 from fimfarchive.exceptions import InvalidStoryError
 
 
@@ -80,7 +82,7 @@ class StoryDateMapper(Mapper):
         dates.discard(None)
 
         if dates:
-            return max(dates)
+            return max(arrow.get(date) for date in dates)
         else:
             return None
 
diff --git a/requirements.txt b/requirements.txt
index 14f5624..0bc4ef1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+arrow
 blinker
 jmespath
 requests
diff --git a/tests/test_mappers.py b/tests/test_mappers.py
index eb63dd3..47d4974 100644
--- a/tests/test_mappers.py
+++ b/tests/test_mappers.py
@@ -151,7 +151,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_none_chapters(self, mapper, story):
         """
@@ -164,7 +164,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_empty_chapters(self, mapper, story):
         """
@@ -177,7 +177,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_only_chapter_dates(self, mapper, story):
         """
@@ -193,7 +193,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_only_story_date(self, mapper, story):
         """
@@ -210,7 +210,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_latest_chapter_date(self, mapper, story):
         """
@@ -227,7 +227,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_latest_story_date(self, mapper, story):
         """
@@ -244,7 +244,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
     def test_meta_with_both_latest(self, mapper, story):
         """
@@ -261,7 +261,7 @@ class TestStoryDateMapper:
 
         story = story.merge(meta=meta)
 
-        assert mapper(story) == 5
+        assert mapper(story).timestamp == 5
 
 
 class TestStoryPathMapper: