diff --git a/cps/kobo.py b/cps/kobo.py
index 6e284d9a..87e2d340 100644
--- a/cps/kobo.py
+++ b/cps/kobo.py
@@ -39,10 +39,10 @@ from flask import (
     redirect,
     abort
 )
-from flask_login import login_required, current_user
+from flask_login import current_user, login_required
 from werkzeug.datastructures import Headers
 from sqlalchemy import func
-from sqlalchemy.sql.expression import or_
+from sqlalchemy.sql.expression import and_, or_
 import requests
 
 from . import config, logger, kobo_auth, db, helper, ub
@@ -152,7 +152,7 @@ def HandleSyncRequest():
     # (Ideally we would use a join for this logic, however cross-database joins don't look trivial in SqlAlchemy.)
     recently_restored_or_archived_books = []
     archived_book_ids = {}
-    new_archived_last_modified = datetime.min
+    new_archived_last_modified = datetime.datetime.min
     for archived_book in archived_books:
         if archived_book.last_modified > sync_token.archive_last_modified:
             recently_restored_or_archived_books.append(archived_book.book_id)
@@ -213,6 +213,7 @@ def HandleSyncRequest():
     sync_token.books_last_created = new_books_last_created
     sync_token.books_last_modified = new_books_last_modified
     sync_token.archive_last_modified = new_archived_last_modified
+    sync_token.reading_state_last_modified = new_reading_state_last_modified
 
     if config.config_kobo_proxy:
         return generate_sync_response(request, sync_token, sync_results)
@@ -288,7 +289,7 @@ def create_book_entitlement(book, archived):
         "IsRemoved": archived,
         "IsHiddenFromArchive": False,
         "IsLocked": False,
-        "LastModified": book.last_modified,
+        "LastModified": convert_to_kobo_timestamp_string(book.last_modified),
         "OriginCategory": "Imported",
         "RevisionId": book_uuid,
         "Status": "Active",
@@ -568,7 +569,7 @@ def HandleBookDeletionRequest(book_uuid):
     if not archived_book:
         archived_book = ub.ArchivedBook(user_id=current_user.id, book_id=book_id)
     archived_book.is_archived = True
-    archived_book.last_modified = datetime.utcnow()
+    archived_book.last_modified = datetime.datetime.utcnow()
 
     ub.session.merge(archived_book)
     ub.session.commit()
@@ -577,12 +578,12 @@ def HandleBookDeletionRequest(book_uuid):
 
 
 # TODO: Implement the following routes
-@kobo.route("/v1/library/<book_uuid>/state", methods=["PUT"])
+@kobo.route("/v1/library/<dummy>", methods=["DELETE", "GET"])
 @kobo.route("/v1/library/tags", methods=["POST"])
 @kobo.route("/v1/library/tags/<shelf_name>", methods=["POST"])
 @kobo.route("/v1/library/tags/<tag_id>", methods=["DELETE"])
-def HandleUnimplementedRequest(book_uuid=None, shelf_name=None, tag_id=None):
-    log.debug("Alternative Request received:")
+def HandleUnimplementedRequest(dummy=None, book_uuid=None, shelf_name=None, tag_id=None):
+    log.debug("Unimplemented Library Request received: %s", request.base_url)
     return redirect_or_proxy_request()
 
 
diff --git a/cps/services/SyncToken.py b/cps/services/SyncToken.py
index 15f788f2..9804fdb3 100644
--- a/cps/services/SyncToken.py
+++ b/cps/services/SyncToken.py
@@ -77,6 +77,7 @@ class SyncToken():
             "books_last_modified": {"type": "string"},
             "books_last_created": {"type": "string"},
             "archive_last_modified": {"type": "string"},
+            "reading_state_last_modified": {"type": "string"},
         },
     }
 
@@ -86,11 +87,14 @@ class SyncToken():
         books_last_created=datetime.min,
         books_last_modified=datetime.min,
         archive_last_modified=datetime.min,
+        reading_state_last_modified=datetime.min,
     ):
         self.raw_kobo_store_token = raw_kobo_store_token
         self.books_last_created = books_last_created
         self.books_last_modified = books_last_modified
         self.archive_last_modified = archive_last_modified
+        self.reading_state_last_modified = reading_state_last_modified
+
 
     @staticmethod
     def from_headers(headers):
@@ -123,6 +127,7 @@ class SyncToken():
             books_last_modified = get_datetime_from_json(data_json, "books_last_modified")
             books_last_created = get_datetime_from_json(data_json, "books_last_created")
             archive_last_modified = get_datetime_from_json(data_json, "archive_last_modified")
+            reading_state_last_modified = get_datetime_from_json(data_json, "reading_state_last_modified")
         except TypeError:
             log.error("SyncToken timestamps don't parse to a datetime.")
             return SyncToken(raw_kobo_store_token=raw_kobo_store_token)
@@ -131,7 +136,8 @@ class SyncToken():
             raw_kobo_store_token=raw_kobo_store_token,
             books_last_created=books_last_created,
             books_last_modified=books_last_modified,
-            archive_last_modified=archive_last_modified
+            archive_last_modified=archive_last_modified,
+            reading_state_last_modified=reading_state_last_modified
         )
 
     def set_kobo_store_header(self, store_headers):
@@ -152,7 +158,8 @@ class SyncToken():
                 "raw_kobo_store_token": self.raw_kobo_store_token,
                 "books_last_modified": to_epoch_timestamp(self.books_last_modified),
                 "books_last_created": to_epoch_timestamp(self.books_last_created),
-                "archive_last_modified": to_epoch_timestamp(self.archive_last_modified)
+                "archive_last_modified": to_epoch_timestamp(self.archive_last_modified),
+                "reading_state_last_modified": to_epoch_timestamp(self.reading_state_last_modified)
             },
         }
         return b64encode_json(token)