diff --git a/proxmox/Cargo.toml b/proxmox/Cargo.toml
index dea5ca02..c98f6df1 100644
--- a/proxmox/Cargo.toml
+++ b/proxmox/Cargo.toml
@@ -20,7 +20,6 @@ nix = "0.16"
 
 # tools module:
 base64 = "0.12"
-chrono = "0.4"
 endian_trait = { version = "0.6", features = ["arrays"] }
 regex = "1.2"
 serde = { version = "1.0", features = ["derive"] }
diff --git a/proxmox/src/tools/serde.rs b/proxmox/src/tools/serde.rs
index b96ba609..b8d4a13f 100644
--- a/proxmox/src/tools/serde.rs
+++ b/proxmox/src/tools/serde.rs
@@ -1,57 +1,5 @@
 //! Serialization helpers for serde
 
-/// Serialize DateTime<Local> as RFC3339.
-///
-/// Usage example:
-/// ```
-/// # use proxmox::tools;
-///
-/// use chrono::{DateTime, TimeZone, Utc};
-/// use serde::{Deserialize, Serialize};
-///
-/// # #[derive(Debug)]
-/// #[derive(Deserialize, PartialEq, Serialize)]
-/// struct Foo {
-///     #[serde(with = "proxmox::tools::serde::date_time_as_rfc3339")]
-///     date: DateTime<Utc>,
-/// }
-///
-/// let obj = Foo { date: Utc.timestamp_millis(86400000) }; // random test value
-/// let json = serde_json::to_string(&obj).unwrap();
-/// assert_eq!(json, r#"{"date":"1970-01-02T00:00:00+00:00"}"#);
-///
-/// let deserialized: Foo = serde_json::from_str(&json).unwrap();
-/// assert_eq!(obj, deserialized);
-/// ```
-pub mod date_time_as_rfc3339 {
-    use chrono::{DateTime, TimeZone};
-    use serde::{Deserialize, Deserializer, Serializer};
-
-    pub fn serialize<S, Tz>(time: &DateTime<Tz>, serializer: S) -> Result<S::Ok, S::Error>
-    where
-        S: Serializer,
-        Tz: TimeZone,
-        Tz::Offset: std::fmt::Display,
-    {
-        serializer.serialize_str(&time.to_rfc3339())
-    }
-
-    pub fn deserialize<'de, D, Tz>(deserializer: D) -> Result<DateTime<Tz>, D::Error>
-    where
-        D: Deserializer<'de>,
-        Tz: TimeZone,
-        DateTime<Tz>: std::str::FromStr,
-        <DateTime<Tz> as std::str::FromStr>::Err: std::string::ToString,
-    {
-        use serde::de::Error;
-        String::deserialize(deserializer).and_then(|string| {
-            string
-                .parse::<DateTime<Tz>>()
-                .map_err(|err| Error::custom(err.to_string()))
-        })
-    }
-}
-
 /// Serialize Unix epoch (i64) as RFC3339.
 ///
 /// Usage example: