diff --git a/bookmarks/services/exporter.py b/bookmarks/services/exporter.py
index ebc3632..fe41bf4 100644
--- a/bookmarks/services/exporter.py
+++ b/bookmarks/services/exporter.py
@@ -40,9 +40,10 @@ def append_bookmark(doc: BookmarkDocument, bookmark: Bookmark):
     toread = "1" if bookmark.unread else "0"
     private = "0" if bookmark.shared else "1"
     added = int(bookmark.date_added.timestamp())
+    modified = int(bookmark.date_modified.timestamp())
 
     doc.append(
-        f'<DT><A HREF="{url}" ADD_DATE="{added}" PRIVATE="{private}" TOREAD="{toread}" TAGS="{tags}">{title}</A>'
+        f'<DT><A HREF="{url}" ADD_DATE="{added}" LAST_MODIFIED="{modified}" PRIVATE="{private}" TOREAD="{toread}" TAGS="{tags}">{title}</A>'
     )
 
     if desc:
diff --git a/bookmarks/services/importer.py b/bookmarks/services/importer.py
index d4bbd5a..41fda08 100644
--- a/bookmarks/services/importer.py
+++ b/bookmarks/services/importer.py
@@ -231,7 +231,10 @@ def _copy_bookmark_data(
         bookmark.date_added = parse_timestamp(netscape_bookmark.date_added)
     else:
         bookmark.date_added = timezone.now()
-    bookmark.date_modified = bookmark.date_added
+    if netscape_bookmark.date_modified:
+        bookmark.date_modified = parse_timestamp(netscape_bookmark.date_modified)
+    else:
+        bookmark.date_modified = bookmark.date_added
     bookmark.unread = netscape_bookmark.to_read
     if netscape_bookmark.title:
         bookmark.title = netscape_bookmark.title
diff --git a/bookmarks/services/parser.py b/bookmarks/services/parser.py
index 81c4a41..4eb7c1c 100644
--- a/bookmarks/services/parser.py
+++ b/bookmarks/services/parser.py
@@ -12,6 +12,7 @@ class NetscapeBookmark:
     description: str
     notes: str
     date_added: str
+    date_modified: str
     tag_names: List[str]
     to_read: bool
     private: bool
@@ -27,6 +28,7 @@ class BookmarkParser(HTMLParser):
         self.bookmark = None
         self.href = ""
         self.add_date = ""
+        self.last_modified = ""
         self.tags = ""
         self.title = ""
         self.description = ""
@@ -72,6 +74,7 @@ class BookmarkParser(HTMLParser):
             description="",
             notes="",
             date_added=self.add_date,
+            date_modified=self.last_modified,
             tag_names=tag_names,
             to_read=self.toread == "1",
             # Mark as private by default, also when attribute is not specified
@@ -97,6 +100,7 @@ class BookmarkParser(HTMLParser):
         self.bookmark = None
         self.href = ""
         self.add_date = ""
+        self.last_modified = ""
         self.tags = ""
         self.title = ""
         self.description = ""
diff --git a/bookmarks/tests/helpers.py b/bookmarks/tests/helpers.py
index ca3ea64..bc6539e 100644
--- a/bookmarks/tests/helpers.py
+++ b/bookmarks/tests/helpers.py
@@ -45,6 +45,7 @@ class BookmarkFactoryMixin:
         favicon_file: str = "",
         preview_image_file: str = "",
         added: datetime = None,
+        modified: datetime = None,
     ):
         if title is None:
             title = get_random_string(length=32)
@@ -57,13 +58,15 @@ class BookmarkFactoryMixin:
             url = "https://example.com/" + unique_id
         if added is None:
             added = timezone.now()
+        if modified is None:
+            modified = timezone.now()
         bookmark = Bookmark(
             url=url,
             title=title,
             description=description,
             notes=notes,
             date_added=added,
-            date_modified=timezone.now(),
+            date_modified=modified,
             owner=user,
             is_archived=is_archived,
             unread=unread,
@@ -320,6 +323,7 @@ class BookmarkHtmlTag:
         title: str = "",
         description: str = "",
         add_date: str = "",
+        last_modified: str = "",
         tags: str = "",
         to_read: bool = False,
         private: bool = True,
@@ -328,6 +332,7 @@ class BookmarkHtmlTag:
         self.title = title
         self.description = description
         self.add_date = add_date
+        self.last_modified = last_modified
         self.tags = tags
         self.to_read = to_read
         self.private = private
@@ -339,6 +344,7 @@ class ImportTestMixin:
         <DT>
         <A {f'HREF="{tag.href}"' if tag.href else ''}
            {f'ADD_DATE="{tag.add_date}"' if tag.add_date else ''}
+           {f'LAST_MODIFIED="{tag.last_modified}"' if tag.last_modified else ''}
            {f'TAGS="{tag.tags}"' if tag.tags else ''}
            TOREAD="{1 if tag.to_read else 0}"
            PRIVATE="{1 if tag.private else 0}">
diff --git a/bookmarks/tests/test_exporter.py b/bookmarks/tests/test_exporter.py
index 2457866..2056bc7 100644
--- a/bookmarks/tests/test_exporter.py
+++ b/bookmarks/tests/test_exporter.py
@@ -1,5 +1,6 @@
+from datetime import datetime, timezone
+
 from django.test import TestCase
-from django.utils import timezone
 
 from bookmarks.services import exporter
 from bookmarks.tests.helpers import BookmarkFactoryMixin
@@ -7,20 +8,19 @@ from bookmarks.tests.helpers import BookmarkFactoryMixin
 
 class ExporterTestCase(TestCase, BookmarkFactoryMixin):
     def test_export_bookmarks(self):
-        added = timezone.now()
-        timestamp = int(added.timestamp())
-
         bookmarks = [
             self.setup_bookmark(
                 url="https://example.com/1",
                 title="Title 1",
-                added=added,
+                added=datetime.fromtimestamp(1, timezone.utc),
+                modified=datetime.fromtimestamp(11, timezone.utc),
                 description="Example description",
             ),
             self.setup_bookmark(
                 url="https://example.com/2",
                 title="Title 2",
-                added=added,
+                added=datetime.fromtimestamp(2, timezone.utc),
+                modified=datetime.fromtimestamp(22, timezone.utc),
                 tags=[
                     self.setup_tag(name="tag1"),
                     self.setup_tag(name="tag2"),
@@ -28,15 +28,24 @@ class ExporterTestCase(TestCase, BookmarkFactoryMixin):
                 ],
             ),
             self.setup_bookmark(
-                url="https://example.com/3", title="Title 3", added=added, unread=True
+                url="https://example.com/3",
+                title="Title 3",
+                added=datetime.fromtimestamp(3, timezone.utc),
+                modified=datetime.fromtimestamp(33, timezone.utc),
+                unread=True,
             ),
             self.setup_bookmark(
-                url="https://example.com/4", title="Title 4", added=added, shared=True
+                url="https://example.com/4",
+                title="Title 4",
+                added=datetime.fromtimestamp(4, timezone.utc),
+                modified=datetime.fromtimestamp(44, timezone.utc),
+                shared=True,
             ),
             self.setup_bookmark(
                 url="https://example.com/5",
                 title="Title 5",
-                added=added,
+                added=datetime.fromtimestamp(5, timezone.utc),
+                modified=datetime.fromtimestamp(55, timezone.utc),
                 shared=True,
                 description="Example description",
                 notes="Example notes",
@@ -44,20 +53,23 @@ class ExporterTestCase(TestCase, BookmarkFactoryMixin):
             self.setup_bookmark(
                 url="https://example.com/6",
                 title="Title 6",
-                added=added,
+                added=datetime.fromtimestamp(6, timezone.utc),
+                modified=datetime.fromtimestamp(66, timezone.utc),
                 shared=True,
                 notes="Example notes",
             ),
             self.setup_bookmark(
                 url="https://example.com/7",
                 title="Title 7",
-                added=added,
+                added=datetime.fromtimestamp(7, timezone.utc),
+                modified=datetime.fromtimestamp(77, timezone.utc),
                 is_archived=True,
             ),
             self.setup_bookmark(
                 url="https://example.com/8",
                 title="Title 8",
-                added=added,
+                added=datetime.fromtimestamp(8, timezone.utc),
+                modified=datetime.fromtimestamp(88, timezone.utc),
                 tags=[self.setup_tag(name="tag4"), self.setup_tag(name="tag5")],
                 is_archived=True,
             ),
@@ -65,17 +77,17 @@ class ExporterTestCase(TestCase, BookmarkFactoryMixin):
         html = exporter.export_netscape_html(bookmarks)
 
         lines = [
-            f'<DT><A HREF="https://example.com/1" ADD_DATE="{timestamp}" PRIVATE="1" TOREAD="0" TAGS="">Title 1</A>',
+            '<DT><A HREF="https://example.com/1" ADD_DATE="1" LAST_MODIFIED="11" PRIVATE="1" TOREAD="0" TAGS="">Title 1</A>',
             "<DD>Example description",
-            f'<DT><A HREF="https://example.com/2" ADD_DATE="{timestamp}" PRIVATE="1" TOREAD="0" TAGS="tag1,tag2,tag3">Title 2</A>',
-            f'<DT><A HREF="https://example.com/3" ADD_DATE="{timestamp}" PRIVATE="1" TOREAD="1" TAGS="">Title 3</A>',
-            f'<DT><A HREF="https://example.com/4" ADD_DATE="{timestamp}" PRIVATE="0" TOREAD="0" TAGS="">Title 4</A>',
-            f'<DT><A HREF="https://example.com/5" ADD_DATE="{timestamp}" PRIVATE="0" TOREAD="0" TAGS="">Title 5</A>',
+            '<DT><A HREF="https://example.com/2" ADD_DATE="2" LAST_MODIFIED="22" PRIVATE="1" TOREAD="0" TAGS="tag1,tag2,tag3">Title 2</A>',
+            '<DT><A HREF="https://example.com/3" ADD_DATE="3" LAST_MODIFIED="33" PRIVATE="1" TOREAD="1" TAGS="">Title 3</A>',
+            '<DT><A HREF="https://example.com/4" ADD_DATE="4" LAST_MODIFIED="44" PRIVATE="0" TOREAD="0" TAGS="">Title 4</A>',
+            '<DT><A HREF="https://example.com/5" ADD_DATE="5" LAST_MODIFIED="55" PRIVATE="0" TOREAD="0" TAGS="">Title 5</A>',
             "<DD>Example description[linkding-notes]Example notes[/linkding-notes]",
-            f'<DT><A HREF="https://example.com/6" ADD_DATE="{timestamp}" PRIVATE="0" TOREAD="0" TAGS="">Title 6</A>',
+            '<DT><A HREF="https://example.com/6" ADD_DATE="6" LAST_MODIFIED="66" PRIVATE="0" TOREAD="0" TAGS="">Title 6</A>',
             "<DD>[linkding-notes]Example notes[/linkding-notes]",
-            f'<DT><A HREF="https://example.com/7" ADD_DATE="{timestamp}" PRIVATE="1" TOREAD="0" TAGS="linkding:archived">Title 7</A>',
-            f'<DT><A HREF="https://example.com/8" ADD_DATE="{timestamp}" PRIVATE="1" TOREAD="0" TAGS="tag4,tag5,linkding:archived">Title 8</A>',
+            '<DT><A HREF="https://example.com/7" ADD_DATE="7" LAST_MODIFIED="77" PRIVATE="1" TOREAD="0" TAGS="linkding:archived">Title 7</A>',
+            '<DT><A HREF="https://example.com/8" ADD_DATE="8" LAST_MODIFIED="88" PRIVATE="1" TOREAD="0" TAGS="tag4,tag5,linkding:archived">Title 8</A>',
         ]
         self.assertIn("\n\r".join(lines), html)
 
diff --git a/bookmarks/tests/test_importer.py b/bookmarks/tests/test_importer.py
index 56b97ce..b632d62 100644
--- a/bookmarks/tests/test_importer.py
+++ b/bookmarks/tests/test_importer.py
@@ -26,6 +26,9 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
             self.assertEqual(bookmark.title, html_tag.title)
             self.assertEqual(bookmark.description, html_tag.description)
             self.assertEqual(bookmark.date_added, parse_timestamp(html_tag.add_date))
+            self.assertEqual(
+                bookmark.date_modified, parse_timestamp(html_tag.last_modified)
+            )
             self.assertEqual(bookmark.unread, html_tag.to_read)
             self.assertEqual(bookmark.shared, not html_tag.private)
 
@@ -45,6 +48,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Example title",
                 description="Example description",
                 add_date="1",
+                last_modified="11",
                 tags="example-tag",
             ),
             BookmarkHtmlTag(
@@ -52,6 +56,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Foo title",
                 description="",
                 add_date="2",
+                last_modified="22",
                 tags="",
             ),
             BookmarkHtmlTag(
@@ -59,6 +64,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Bar title",
                 description="Bar description",
                 add_date="3",
+                last_modified="33",
                 tags="bar-tag, other-tag",
             ),
             BookmarkHtmlTag(
@@ -66,6 +72,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Baz title",
                 description="Baz description",
                 add_date="4",
+                last_modified="44",
                 to_read=True,
             ),
         ]
@@ -90,6 +97,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Example title",
                 description="Example description",
                 add_date="1",
+                last_modified="11",
                 tags="example-tag",
             ),
             BookmarkHtmlTag(
@@ -97,6 +105,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Foo title",
                 description="",
                 add_date="2",
+                last_modified="22",
                 tags="",
             ),
             BookmarkHtmlTag(
@@ -104,20 +113,23 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Bar title",
                 description="Bar description",
                 add_date="3",
+                last_modified="33",
                 tags="bar-tag, other-tag",
             ),
             BookmarkHtmlTag(
                 href="https://example.com/unread",
                 title="Unread title",
                 description="Unread description",
-                add_date="3",
+                add_date="4",
+                last_modified="44",
                 to_read=True,
             ),
             BookmarkHtmlTag(
                 href="https://example.com/private",
                 title="Private title",
                 description="Private description",
-                add_date="4",
+                add_date="5",
+                last_modified="55",
                 private=True,
             ),
         ]
@@ -136,6 +148,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Updated Example title",
                 description="Updated Example description",
                 add_date="111",
+                last_modified="1111",
                 tags="updated-example-tag",
             ),
             BookmarkHtmlTag(
@@ -143,6 +156,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Updated Foo title",
                 description="Updated Foo description",
                 add_date="222",
+                last_modified="2222",
                 tags="new-tag",
             ),
             BookmarkHtmlTag(
@@ -150,6 +164,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Updated Bar title",
                 description="Updated Bar description",
                 add_date="333",
+                last_modified="3333",
                 tags="updated-bar-tag, updated-other-tag",
             ),
             BookmarkHtmlTag(
@@ -157,6 +172,7 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Unread title",
                 description="Unread description",
                 add_date="3",
+                last_modified="3",
                 to_read=False,
             ),
             BookmarkHtmlTag(
@@ -164,9 +180,15 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 title="Private title",
                 description="Private description",
                 add_date="4",
+                last_modified="4",
                 private=False,
             ),
-            BookmarkHtmlTag(href="https://baz.com", add_date="444", tags="baz-tag"),
+            BookmarkHtmlTag(
+                href="https://baz.com",
+                add_date="444",
+                last_modified="4444",
+                tags="baz-tag",
+            ),
         ]
 
         # Import updated data
@@ -291,6 +313,19 @@ class ImporterTestCase(TestCase, BookmarkFactoryMixin, ImportTestMixin):
                 Bookmark.objects.all()[0].date_added, timezone.datetime(2021, 1, 1)
             )
 
+    def test_use_add_date_when_no_last_modified(self):
+        test_html = self.render_html(
+            tags_html=f"""
+            <DT><A HREF="https://example.com" ADD_DATE="1">Example.com</A>
+            <DD>Example.com
+        """
+        )
+
+        import_netscape_html(test_html, self.get_or_create_test_user())
+
+        self.assertEqual(Bookmark.objects.count(), 1)
+        self.assertEqual(Bookmark.objects.all()[0].date_modified, parse_timestamp("1"))
+
     def test_keep_title_if_imported_bookmark_has_empty_title(self):
         test_html = self.render_html(
             tags=[BookmarkHtmlTag(href="https://example.com", title="Example.com")]
diff --git a/bookmarks/tests/test_parser.py b/bookmarks/tests/test_parser.py
index 1607217..3e82980 100644
--- a/bookmarks/tests/test_parser.py
+++ b/bookmarks/tests/test_parser.py
@@ -18,6 +18,7 @@ class ParserTestCase(TestCase, ImportTestMixin):
             self.assertEqual(bookmark.href, html_tag.href)
             self.assertEqual(bookmark.title, html_tag.title)
             self.assertEqual(bookmark.date_added, html_tag.add_date)
+            self.assertEqual(bookmark.date_modified, html_tag.last_modified)
             self.assertEqual(bookmark.description, html_tag.description)
             self.assertEqual(bookmark.tag_names, parse_tag_string(html_tag.tags))
             self.assertEqual(bookmark.to_read, html_tag.to_read)
@@ -30,6 +31,7 @@ class ParserTestCase(TestCase, ImportTestMixin):
                 title="Example title",
                 description="Example description",
                 add_date="1",
+                last_modified="11",
                 tags="example-tag",
             ),
             BookmarkHtmlTag(
@@ -37,6 +39,7 @@ class ParserTestCase(TestCase, ImportTestMixin):
                 title="Foo title",
                 description="",
                 add_date="2",
+                last_modified="22",
                 tags="",
             ),
             BookmarkHtmlTag(
@@ -44,13 +47,14 @@ class ParserTestCase(TestCase, ImportTestMixin):
                 title="Bar title",
                 description="Bar description",
                 add_date="3",
+                last_modified="33",
                 tags="bar-tag, other-tag",
             ),
             BookmarkHtmlTag(
                 href="https://example.com/baz",
                 title="Baz title",
                 description="Baz description",
-                add_date="3",
+                add_date="4",
                 to_read=True,
             ),
         ]
@@ -72,9 +76,17 @@ class ParserTestCase(TestCase, ImportTestMixin):
                 title="Example title",
                 description="Example description",
                 add_date="1",
+                last_modified="1",
                 tags="example-tag",
             ),
-            BookmarkHtmlTag(href="", title="", description="", add_date="", tags=""),
+            BookmarkHtmlTag(
+                href="",
+                title="",
+                description="",
+                add_date="",
+                last_modified="",
+                tags="",
+            ),
         ]
         html = self.render_html(html_tags)
         bookmarks = parse(html)