diff --git a/Cargo.toml b/Cargo.toml
index 8c1f32974..757d3a604 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ atom = ["atom_syndication"]
 quick-xml = { version = "0.30", features = ["encoding"] }
 derive_builder = { version = "0.12", optional = true }
 never = { version = "0.1", optional = true }
-chrono = { version = "0.4", optional = true, default-features = false, features = ["alloc"] }
+chrono = { version = "0.4.31", optional = true, default-features = false, features = ["alloc"] }
 url = { version = "2.1", optional = true }
 mime = { version = "0.3", optional = true }
 serde = { version = "1.0", optional = true, features = ["derive"] }
diff --git a/src/channel.rs b/src/channel.rs
index f58b1e152..684cd43cb 100644
--- a/src/channel.rs
+++ b/src/channel.rs
@@ -369,7 +369,7 @@ impl Channel {
     ///
     /// let mut channel = Channel::default();
     /// channel.set_pub_date(Utc.with_ymd_and_hms(2017, 1, 1, 12, 0, 0).unwrap().to_rfc2822());
-    /// assert_eq!(channel.pub_date(), Some("Sun, 01 Jan 2017 12:00:00 +0000"));
+    /// assert_eq!(channel.pub_date(), Some("Sun, 1 Jan 2017 12:00:00 +0000"));
     /// # }
     /// ```
     pub fn set_pub_date<V>(&mut self, pub_date: V)
@@ -415,7 +415,7 @@ impl Channel {
     ///
     /// let mut channel = Channel::default();
     /// channel.set_last_build_date(Utc.with_ymd_and_hms(2017, 1, 1, 12, 0, 0).unwrap().to_rfc2822());
-    /// assert_eq!(channel.last_build_date(), Some("Sun, 01 Jan 2017 12:00:00 +0000"));
+    /// assert_eq!(channel.last_build_date(), Some("Sun, 1 Jan 2017 12:00:00 +0000"));
     /// # }
     /// ```
     pub fn set_last_build_date<V>(&mut self, last_build_date: V)
diff --git a/src/item.rs b/src/item.rs
index 2fa96ad37..173665c0b 100644
--- a/src/item.rs
+++ b/src/item.rs
@@ -377,10 +377,10 @@ impl Item {
     ///
     /// let mut item = Item::default();
     /// item.set_pub_date(Utc.with_ymd_and_hms(2017, 1, 1, 12, 0, 0).unwrap().to_rfc2822());
-    /// assert_eq!(item.pub_date(), Some("Sun, 01 Jan 2017 12:00:00 +0000"));
+    /// assert_eq!(item.pub_date(), Some("Sun, 1 Jan 2017 12:00:00 +0000"));
     ///
     /// item.set_pub_date(FixedOffset::east_opt(2 * 3600).unwrap().with_ymd_and_hms(2017, 1, 1, 12, 0, 0).unwrap().to_rfc2822());
-    /// assert_eq!(item.pub_date(), Some("Sun, 01 Jan 2017 12:00:00 +0200"));
+    /// assert_eq!(item.pub_date(), Some("Sun, 1 Jan 2017 12:00:00 +0200"));
     /// # }
     /// ```
     pub fn set_pub_date<V>(&mut self, pub_date: V)