diff --git a/src/datetime/serde.rs b/src/datetime/serde.rs
index 1f9714536a..1de565ad1b 100644
--- a/src/datetime/serde.rs
+++ b/src/datetime/serde.rs
@@ -262,7 +262,7 @@ pub mod ts_nanoseconds {
     }
 }
 
-/// Ser/de to/from timestamps in nanoseconds
+/// Ser/de to/from optional timestamps in nanoseconds
 ///
 /// Intended for use with `serde`'s `with` attribute.
 ///
@@ -392,7 +392,7 @@ pub mod ts_nanoseconds_option {
             formatter.write_str("a unix timestamp in nanoseconds or none")
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in nanoseconds since the epoch
         fn visit_some<D>(self, d: D) -> Result<Self::Value, D::Error>
         where
             D: de::Deserializer<'de>,
@@ -400,7 +400,7 @@ pub mod ts_nanoseconds_option {
             d.deserialize_i64(NanoSecondsTimestampVisitor).map(Some)
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in nanoseconds since the epoch
         fn visit_none<E>(self) -> Result<Self::Value, E>
         where
             E: de::Error,
@@ -408,7 +408,7 @@ pub mod ts_nanoseconds_option {
             Ok(None)
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in nanoseconds since the epoch
         fn visit_unit<E>(self) -> Result<Self::Value, E>
         where
             E: de::Error,
@@ -696,7 +696,7 @@ pub mod ts_microseconds_option {
             formatter.write_str("a unix timestamp in microseconds or none")
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in microseconds since the epoch
         fn visit_some<D>(self, d: D) -> Result<Self::Value, D::Error>
         where
             D: de::Deserializer<'de>,
@@ -704,7 +704,7 @@ pub mod ts_microseconds_option {
             d.deserialize_i64(MicroSecondsTimestampVisitor).map(Some)
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in microseconds since the epoch
         fn visit_none<E>(self) -> Result<Self::Value, E>
         where
             E: de::Error,
@@ -712,7 +712,7 @@ pub mod ts_microseconds_option {
             Ok(None)
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in microseconds since the epoch
         fn visit_unit<E>(self) -> Result<Self::Value, E>
         where
             E: de::Error,
@@ -1010,7 +1010,7 @@ pub mod ts_milliseconds_option {
             formatter.write_str("a unix timestamp in milliseconds or none")
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in milliseconds since the epoch
         fn visit_some<D>(self, d: D) -> Result<Self::Value, D::Error>
         where
             D: de::Deserializer<'de>,
@@ -1018,7 +1018,7 @@ pub mod ts_milliseconds_option {
             d.deserialize_i64(MilliSecondsTimestampVisitor).map(Some)
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in milliseconds since the epoch
         fn visit_none<E>(self) -> Result<Self::Value, E>
         where
             E: de::Error,
@@ -1026,7 +1026,7 @@ pub mod ts_milliseconds_option {
             Ok(None)
         }
 
-        /// Deserialize a timestamp in seconds since the epoch
+        /// Deserialize a timestamp in milliseconds since the epoch
         fn visit_unit<E>(self) -> Result<Self::Value, E>
         where
             E: de::Error,
diff --git a/src/naive/datetime/serde.rs b/src/naive/datetime/serde.rs
index 3caaab8af7..cad391b007 100644
--- a/src/naive/datetime/serde.rs
+++ b/src/naive/datetime/serde.rs
@@ -66,7 +66,7 @@ impl<'de> de::Deserialize<'de> for NaiveDateTime {
 /// # extern crate serde_json;
 /// # extern crate serde;
 /// # extern crate chrono;
-/// # use chrono::{TimeZone, NaiveDate, NaiveDateTime, Utc};
+/// # use chrono::{NaiveDate, NaiveDateTime};
 /// use chrono::naive::serde::ts_nanoseconds;
 /// #[derive(Deserialize, Serialize)]
 /// struct S {
@@ -95,7 +95,7 @@ pub mod ts_nanoseconds {
     use super::ne_timestamp;
     use crate::NaiveDateTime;
 
-    /// Serialize a UTC datetime into an integer number of nanoseconds since the epoch
+    /// Serialize a datetime into an integer number of nanoseconds since the epoch
     ///
     /// Intended for use with `serde`s `serialize_with` attribute.
     ///
@@ -110,7 +110,7 @@ pub mod ts_nanoseconds {
     /// # #[macro_use] extern crate serde_json;
     /// # #[macro_use] extern crate serde;
     /// # extern crate chrono;
-    /// # use chrono::{TimeZone, NaiveDate, NaiveDateTime, Utc};
+    /// # use chrono::{NaiveDate, NaiveDateTime};
     /// # use serde::Serialize;
     /// use chrono::naive::serde::ts_nanoseconds::serialize as to_nano_ts;
     /// #[derive(Serialize)]
@@ -136,7 +136,7 @@ pub mod ts_nanoseconds {
         serializer.serialize_i64(dt.timestamp_nanos())
     }
 
-    /// Deserialize a `DateTime` from a nanoseconds timestamp
+    /// Deserialize a `NaiveDateTime` from a nanoseconds timestamp
     ///
     /// Intended for use with `serde`s `deserialize_with` attribute.
     ///
@@ -151,7 +151,7 @@ pub mod ts_nanoseconds {
     /// # #[macro_use] extern crate serde_json;
     /// # extern crate serde;
     /// # extern crate chrono;
-    /// # use chrono::{NaiveDateTime, Utc};
+    /// # use chrono::NaiveDateTime;
     /// # use serde::Deserialize;
     /// use chrono::naive::serde::ts_nanoseconds::deserialize as from_nano_ts;
     /// #[derive(Deserialize)]
@@ -216,7 +216,7 @@ pub mod ts_nanoseconds {
 /// # extern crate serde_json;
 /// # extern crate serde;
 /// # extern crate chrono;
-/// # use chrono::{TimeZone, NaiveDate, NaiveDateTime, Utc};
+/// # use chrono::{NaiveDate, NaiveDateTime};
 /// use chrono::naive::serde::ts_milliseconds;
 /// #[derive(Deserialize, Serialize)]
 /// struct S {
@@ -245,7 +245,7 @@ pub mod ts_milliseconds {
     use super::ne_timestamp;
     use crate::NaiveDateTime;
 
-    /// Serialize a UTC datetime into an integer number of milliseconds since the epoch
+    /// Serialize a datetime into an integer number of milliseconds since the epoch
     ///
     /// Intended for use with `serde`s `serialize_with` attribute.
     ///
@@ -260,7 +260,7 @@ pub mod ts_milliseconds {
     /// # #[macro_use] extern crate serde_json;
     /// # #[macro_use] extern crate serde;
     /// # extern crate chrono;
-    /// # use chrono::{TimeZone, NaiveDate, NaiveDateTime, Utc};
+    /// # use chrono::{NaiveDate, NaiveDateTime};
     /// # use serde::Serialize;
     /// use chrono::naive::serde::ts_milliseconds::serialize as to_milli_ts;
     /// #[derive(Serialize)]
@@ -286,7 +286,7 @@ pub mod ts_milliseconds {
         serializer.serialize_i64(dt.timestamp_millis())
     }
 
-    /// Deserialize a `DateTime` from a milliseconds timestamp
+    /// Deserialize a `NaiveDateTime` from a milliseconds timestamp
     ///
     /// Intended for use with `serde`s `deserialize_with` attribute.
     ///
@@ -301,7 +301,7 @@ pub mod ts_milliseconds {
     /// # #[macro_use] extern crate serde_json;
     /// # extern crate serde;
     /// # extern crate chrono;
-    /// # use chrono::{NaiveDateTime, Utc};
+    /// # use chrono::NaiveDateTime;
     /// # use serde::Deserialize;
     /// use chrono::naive::serde::ts_milliseconds::deserialize as from_milli_ts;
     /// #[derive(Deserialize)]
@@ -366,7 +366,7 @@ pub mod ts_milliseconds {
 /// # extern crate serde_json;
 /// # extern crate serde;
 /// # extern crate chrono;
-/// # use chrono::{TimeZone, NaiveDate, NaiveDateTime, Utc};
+/// # use chrono::{NaiveDate, NaiveDateTime};
 /// use chrono::naive::serde::ts_seconds;
 /// #[derive(Deserialize, Serialize)]
 /// struct S {
@@ -395,7 +395,7 @@ pub mod ts_seconds {
     use super::ne_timestamp;
     use crate::NaiveDateTime;
 
-    /// Serialize a UTC datetime into an integer number of seconds since the epoch
+    /// Serialize a datetime into an integer number of seconds since the epoch
     ///
     /// Intended for use with `serde`s `serialize_with` attribute.
     ///
@@ -410,7 +410,7 @@ pub mod ts_seconds {
     /// # #[macro_use] extern crate serde_json;
     /// # #[macro_use] extern crate serde;
     /// # extern crate chrono;
-    /// # use chrono::{TimeZone, NaiveDate, NaiveDateTime, Utc};
+    /// # use chrono::{NaiveDate, NaiveDateTime};
     /// # use serde::Serialize;
     /// use chrono::naive::serde::ts_seconds::serialize as to_ts;
     /// #[derive(Serialize)]
@@ -436,7 +436,7 @@ pub mod ts_seconds {
         serializer.serialize_i64(dt.timestamp())
     }
 
-    /// Deserialize a `DateTime` from a seconds timestamp
+    /// Deserialize a `NaiveDateTime` from a seconds timestamp
     ///
     /// Intended for use with `serde`s `deserialize_with` attribute.
     ///
@@ -451,7 +451,7 @@ pub mod ts_seconds {
     /// # #[macro_use] extern crate serde_json;
     /// # extern crate serde;
     /// # extern crate chrono;
-    /// # use chrono::{NaiveDateTime, Utc};
+    /// # use chrono::NaiveDateTime;
     /// # use serde::Deserialize;
     /// use chrono::naive::serde::ts_seconds::deserialize as from_ts;
     /// #[derive(Deserialize)]