diff --git a/datafusion/functions/src/datetime/to_local_time.rs b/datafusion/functions/src/datetime/to_local_time.rs
index b286c0217baab..1febc8811140e 100644
--- a/datafusion/functions/src/datetime/to_local_time.rs
+++ b/datafusion/functions/src/datetime/to_local_time.rs
@@ -248,35 +248,7 @@ impl ToLocalTimeFunc {
 /// 2019-03-31T01:00:00
 /// ```
 ///
-/// # Example
-///
-/// ```
-/// # use chrono::NaiveDateTime;
-/// # use arrow::array::types::TimestampNanosecondType;
-/// # use datafusion_functions::datetime::to_local_time::adjust_to_local_time;
-///
-/// let timestamp_str = "2020-03-31T13:40:00";
-/// let tz: arrow::array::timezone::Tz =
-///     "America/New_York".parse().expect("Invalid timezone");
-///
-/// let timestamp = timestamp_str
-///     .parse::<NaiveDateTime>()
-///     .unwrap()
-///     .and_local_timezone(tz) // this is in a local timezone
-///     .unwrap()
-///     .timestamp_nanos_opt()
-///     .unwrap();
-///
-/// let expected_timestamp = timestamp_str
-///     .parse::<NaiveDateTime>()
-///     .unwrap()
-///     .and_utc() // this is in UTC
-///     .timestamp_nanos_opt()
-///     .unwrap();
-///
-/// let res = adjust_to_local_time::<TimestampNanosecondType>(timestamp, tz);
-/// assert_eq!(res, expected_timestamp);
-/// ```
+/// See `test_adjust_to_local_time()` for example
 fn adjust_to_local_time<T: ArrowTimestampType>(ts: i64, tz: Tz) -> i64 {
     let date_time = match T::UNIT {
         Nanosecond => Utc.timestamp_nanos(ts),