Items include a last modified (DTSTAMP) date

src/event.rs

@@ -1,6 +1,7 @@
 //! Calendar events
 
 use serde::{Deserialize, Serialize};
+use chrono::{DateTime, Utc};
 
 use crate::item::ItemId;
 use crate::item::SyncStatus;
@@ -31,6 +32,10 @@ impl Event {
         &self.name
     }
 
+    pub fn last_modified(&self) -> &DateTime<Utc> {
+        unimplemented!()
+    }
+
     pub fn sync_status(&self) -> &SyncStatus {
         &self.sync_status
     }