diff --git a/pgx-tests/src/tests/datetime_tests.rs b/pgx-tests/src/tests/datetime_tests.rs
index 1d007e2228..2fbf98f31d 100644
--- a/pgx-tests/src/tests/datetime_tests.rs
+++ b/pgx-tests/src/tests/datetime_tests.rs
@@ -530,6 +530,7 @@ mod tests {
 
     #[pg_test]
     fn test_duration_to_interval_err() {
+        use pgx::IntervalConversionError;
         // normal limit of i32::MAX months
         let duration = time::Duration::days(pg_sys::DAYS_PER_MONTH as i64 * i32::MAX as i64);
 
diff --git a/pgx/src/datum/interval.rs b/pgx/src/datum/interval.rs
index 64f465a9e6..d54616b776 100644
--- a/pgx/src/datum/interval.rs
+++ b/pgx/src/datum/interval.rs
@@ -9,7 +9,8 @@ Use of this source code is governed by the MIT license that can be found in the
 
 use std::ops::{Mul, Sub};
 
-use crate::{direct_function_call, pg_sys, FromDatum, IntoDatum, USECS_PER_SEC};
+use crate::datum::time::USECS_PER_SEC;
+use crate::{direct_function_call, pg_sys, FromDatum, IntoDatum};
 use pg_sys::{DAYS_PER_MONTH, SECS_PER_DAY};
 use pgx_utils::sql_entity_graph::metadata::{
     ArgumentError, Returns, ReturnsError, SqlMapping, SqlTranslatable,
@@ -61,7 +62,7 @@ impl Interval {
 impl TryFrom<pg_sys::Datum> for Interval {
     type Error = &'static str;
     fn try_from(d: pg_sys::Datum) -> Result<Self, Self::Error> {
-        Ok(Interval(unsafe { *d.ptr_cast() }))
+        Ok(Interval(unsafe { *d.cast_mut_ptr::<pg_sys::Interval>() }))
     }
 }
 
@@ -118,8 +119,8 @@ impl TryFrom<Duration> for Interval {
 impl From<Interval> for Duration {
     fn from(interval: Interval) -> Duration {
         let interval = interval.0; // internal interval
-        let sec = interval.time / USECS_PER_SEC;
-        let fsec = ((interval.time - (sec * USECS_PER_SEC)) * 1000) as i32; // convert usec to nsec
+        let sec = interval.time / USECS_PER_SEC as i64;
+        let fsec = ((interval.time - (sec * USECS_PER_SEC as i64)) * 1000) as i32; // convert usec to nsec
 
         let mut duration = Duration::new(sec, fsec);
 
diff --git a/pgx/src/datum/time.rs b/pgx/src/datum/time.rs
index 20f32c5e0e..a2900b325f 100644
--- a/pgx/src/datum/time.rs
+++ b/pgx/src/datum/time.rs
@@ -14,13 +14,12 @@ use pgx_utils::sql_entity_graph::metadata::{
 };
 use time::format_description::FormatItem;
 
-pub(crate) const USECS_PER_HOUR: i64 = 3_600_000_000;
-pub(crate) const USECS_PER_MINUTE: i64 = 60_000_000;
-pub(crate) const USECS_PER_SEC: i64 = 1_000_000;
-#[allow(dead_code)]
-pub(crate) const USECS_PER_DAY: i64 = pg_sys::SECS_PER_DAY as i64 * USECS_PER_SEC;
-pub(crate) const MINS_PER_HOUR: i64 = 60;
-pub(crate) const SEC_PER_MIN: i64 = 60;
+const MINS_PER_HOUR: u64 = 60;
+const SEC_PER_MIN: u64 = 60;
+pub(crate) const USECS_PER_SEC: u64 = 1_000_000;
+pub(crate) const USECS_PER_MINUTE: u64 = USECS_PER_SEC * SEC_PER_MIN;
+pub(crate) const USECS_PER_HOUR: u64 = USECS_PER_MINUTE * MINS_PER_HOUR;
+pub(crate) const USECS_PER_DAY: u64 = USECS_PER_HOUR * 24;
 
 #[derive(Debug, Clone, PartialEq)]
 #[repr(transparent)]
diff --git a/pgx/src/prelude.rs b/pgx/src/prelude.rs
index 7b2bb1bcb9..874d23d226 100644
--- a/pgx/src/prelude.rs
+++ b/pgx/src/prelude.rs
@@ -17,7 +17,7 @@ pub use crate::pgbox::PgBox;
 
 // These could be factored into a temporal type module that could be easily imported for code which works with them.
 // However, reexporting them seems fine for now.
-pub use crate::datum::{Date, Time, TimeWithTimeZone, Timestamp, TimestampWithTimeZone};
+pub use crate::datum::{Date, Interval, Time, TimeWithTimeZone, Timestamp, TimestampWithTimeZone};
 
 pub use crate::pg_sys::PgBuiltInOids;