diff --git a/Cargo.lock b/Cargo.lock
index 482a4bb..ec0b120 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,20 +73,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
-[[package]]
-name = "chrono"
-version = "0.4.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
-dependencies = [
- "libc",
- "num-integer",
- "num-traits",
- "serde",
- "time",
- "winapi",
-]
-
 [[package]]
 name = "core-foundation"
 version = "0.9.1"
@@ -436,7 +422,6 @@ version = "0.1.0"
 dependencies = [
  "async-trait",
  "bitflags",
- "chrono",
  "env_logger",
  "log",
  "minidom",
@@ -476,25 +461,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "num-integer"
-version = "0.1.44"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2cc698a63b549a70bc047073d2949cce27cd1c7b0a4a862d08a8031bc2801db"
-dependencies = [
- "autocfg",
- "num-traits",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "num_cpus"
 version = "1.13.0"
@@ -883,16 +849,6 @@ dependencies = [
  "once_cell",
 ]
 
-[[package]]
-name = "time"
-version = "0.1.43"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
-dependencies = [
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "tinyvec"
 version = "1.1.1"
diff --git a/Cargo.toml b/Cargo.toml
index b6a8cf5..214d67c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,5 @@ bitflags = "1.2"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 async-trait = "0.1"
-chrono = { version = "0.4", features = ["serde"] }
 uuid = { version = "0.8", features = ["v4"] }
 sanitize-filename = "0.3"
diff --git a/src/calendar/cached_calendar.rs b/src/calendar/cached_calendar.rs
index bd54c0e..72cc752 100644
--- a/src/calendar/cached_calendar.rs
+++ b/src/calendar/cached_calendar.rs
@@ -3,7 +3,6 @@ use std::collections::BTreeMap;
 use std::error::Error;
 
 use serde::{Deserialize, Serialize};
-use chrono::{DateTime, Utc};
 use async_trait::async_trait;
 
 use crate::traits::{PartialCalendar, CompleteCalendar};
@@ -21,7 +20,6 @@ pub struct CachedCalendar {
     supported_components: SupportedComponents,
 
     items: HashMap<ItemId, Item>,
-    deleted_items: BTreeMap<DateTime<Utc>, ItemId>,
 }
 
 impl CachedCalendar {
@@ -30,7 +28,6 @@ impl CachedCalendar {
         Self {
             name, id, supported_components,
             items: HashMap::new(),
-            deleted_items: BTreeMap::new(),
         }
     }
 }
@@ -57,7 +54,6 @@ impl PartialCalendar for CachedCalendar {
         if let None = self.items.remove(item_id) {
             return Err("This key does not exist.".into());
         }
-        self.deleted_items.insert(Utc::now(), item_id.clone());
         Ok(())
     }